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C# | I have this code : I would like to not do the adding of a SeparatorTemplate BUT I would like to do the other tasks on the first run of the foreach . Does anyone have a suggestion on how I can do this ? I want to execute the rest of the code in the foreach but not the line adding the template on the first time around . | foreach ( var row in App.cardSetWithWordCounts ) { details.Children.Add ( new SeparatorTemplate ( ) ) ; // do some tasks for every row // in this part of the loop ... } | Is there a way I can determine which row I am on in a foreach loop ? |
C# | Suppose I have a table in my database likeand I want every registrant to automatically be deleted , say , 100 days after registering . What is a proper way to do this , and what is the best way ? The shoddy way I was planning on doing it was going to be to create a sproc and in my server-side code invoke that sproc eve... | Registrants======================================================================= id | name | email | registration_date======================================================================= 1 | `` Sam '' | `` sammypie49 @ gmail.com '' | `` 2016-03-26T14:25:10 '' -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -... | Best way in ASP.NET of configuring rows in a database to delete after a certain time |
C# | I am stumped by EF 6 ... . I have a web application which behaves very badly in terms of performance . While analysing , I found one of the culprits being a method of mine that checks whether a collection is empty ( or not ) on an EF6 entity.Basically , I have : In my app , I need to check whether or not a given instan... | public partial class BaseEntity { public int BaseEntityId { get ; set ; } public string Name { get ; set ; } // a few more properties , of no concern here ... . // a lazily loaded collection of subitems public virtual ICollection < Subitem > Subitems { get ; set ; } } public partial class Subitem { public int SubitemId... | EF6 - not doing what I expected for .Any ( ) |
C# | I currently know of two ways to make an instance immutable in C # : Method 1 - Compile Time ImmutabilityMethod 2 - Readonly FieldsIt would be nice to have a guarantee that , some instance , once instantiated , will not be changed . const and readonly do this to a small degree , but are limited in their scope . I can on... | void Foo ( ) { // Will be serialized as metadata and inserted // as a literal . Only valid for compile-time constants const int bar = 100 ; } class Baz { private readonly string frob ; public Baz ( ) { // Can be set once in the constructor // Only valid on members , not local variables frob = `` frob '' ; } } var xs = ... | Achieving Local Runtime Immutability in C # |
C# | I have a 2d arrow rotating to always face the a target ( the target in this case is the cursor ) , the pivot is my player character . I need to restrict this arrow to only follow the target if it is inside an angle of the player , an example would be 90 degrees , so it would only follow if the cursor is in the top righ... | public float speed ; public Transform target ; void Update ( ) { Vector2 mousePosition = Camera.main.ScreenToWorldPoint ( Input.mousePosition ) ; Vector2 direction = target.position - transform.position ; target.position = mousePosition ; float angle = Mathf.Atan2 ( direction.y , direction.x ) * Mathf.Rad2Deg ; Quatern... | Arrow rotating to face cursor needs to only do so while inside an angle made by two given directions |
C# | I have something like this : As you can see this is done on Message.BodyI now what to do the same thing on other string properties on the Message class and I do n't want to duplicate all that code . Is there a way to do that by passing in the property somehow ? | public Expression < Func < Message , bool > > FilterData ( ) { switch ( this.operatorEnum ) { case FilterParameterOperatorEnum.EqualTo : return message = > ! string.IsNullOrEmpty ( message.Body ) & & message.Body .Equals ( this.value , StringComparison.InvariantCultureIgnoreCase ) ; case FilterParameterOperatorEnum.Not... | Returning Expression < > using various class properties |
C# | I have a method that can be called from many threads , but I just want the 1st thread to do some logic inside the method . So , I 'm planning to use a boolean variable . The first thread that comes in , will set the boolean variable to false ( to prevent further threads to come inside ) , and execute the method logic.S... | private void myMethod ( ) { if ( firsTime ) //set to true in the constructor { firstTime = false ; //To prevent other thread to come inside here . //method logic } } | how to lock on a method content |
C# | Simple code that I expect List < int > 's GenericTypeDefinition to contain a generic interface of ICollection < > . Yet I ca n't derive an acceptable type from List < int > which allows me to compare them properly.OutputI would have expected that r1 contained a type that was equal to b.EDITFixed , Jon Skeet gave me the... | using System ; using System.Collections.Generic ; using System.Linq ; public class Test { public static void Main ( ) { var a = typeof ( List < int > ) ; var b = typeof ( ICollection < > ) ; var r1 = a.GetGenericTypeDefinition ( ) .GetInterfaces ( ) ; foreach ( var x in r1 ) { Console.WriteLine ( x ) ; } Console.WriteL... | Comparing GenericTypeDefinition of interfaces |
C# | I have two classes , A and B . B knows about A , and A does n't know about B . B has properties that can be nicely set from A , although there is no inheritance shared between A and B . There will be many times when I need to assign a B 's properties from an A , but I 'm looking for pointers on where I should put that ... | public class A { } public class B { //constructor ? public B ( A a ) { //set b 's properties from a } //factory method ? public static B FromA ( A a ) { B b = new B ( ) ; //set b 's properties from a return b ; } //setter method ? public static void SetBFromA ( B b , A a ) { //set b 's properties from a } //assignment ... | Conventions in assignment code ? |
C# | Example 1 : vsExample 2 : Is there any benefit to using the first method over the second , or vice versa ? | SomeObject someObject = new SomeObject ( ) ; if ( someObject.Method ( ) ) { //do stuff } //someObject is never used again if ( new SomeObject ( ) .Method ( ) ) { //do stuff } | Is there a benefit to storing an object in a variable before calling a method on it ? |
C# | I am using below method to convert byte [ ] to Bitmap : Just wondering if I need to free up any resources here ? Tried calling Marshal.FreeHGlobal ( ptr ) , but I am getting this error : Invalid access to memory location.Can anyone please guide ? Also , FYI , I could use MemoryStream to get Bitmap out of byte [ ] , but... | public static Bitmap ByteArrayToBitmap ( byte [ ] byteArray ) { int width = 2144 ; int height = 3 ; Bitmap bitmapImage = new Bitmap ( width , height , PixelFormat.Format32bppPArgb ) ; BitmapData bmpData = bitmapImage.LockBits ( new Rectangle ( 0 , 0 , width , height ) , ImageLockMode.ReadWrite , PixelFormat.Format32bpp... | Marshal - Do I need to free any resources ? |
C# | I have two classes ( or models rather ) having some common properties . For instance : I need to write a method that can accept a member selector expression where the member to select can come from either of the two models . This is what I mean : Please note that the selector passed selects both from Model1 and also fr... | public class Model1 { public int Common1 { get ; set ; } public int Common2 { get ; set ; } public int Prop11 { get ; set ; } public int Prop12 { get ; set ; } } public class Model2 { public int Common1 { get ; set ; } public int Common2 { get ; set ; } public int Prop21 { get ; set ; } public int Prop22 { get ; set ; ... | Member selector expression combining two classes |
C# | I 'm trying to create a wpf project without using auto generate files in VS2010 , I thought it would help me to get a better understanding so I hope this wo n't sound super primitive question . Anyway , after making the xaml file and its code behind e.g . myWindow.xaml and myWindow.xaml.cs I also created App.xaml and i... | < Application x : Class= '' test1.App '' xmlns= '' http : //schemas.microsoft.com/winfx/2006/xaml/presentation '' xmlns : x= '' http : //schemas.microsoft.com/winfx/2006/xaml '' StartupUri= '' myWindow.xaml '' > < Application.Resources > < /Application.Resources > < /Application > namespace test1 { /// < summary > /// ... | Making a WPF project manually |
C# | After a build environment update , one of our Smoke Tests broke in TeamCity . Investigation turned out that from the same source code , C : \Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe produces correct binaryC : \Program Files ( x86 ) \MSBuild\14.0\bin\MSBuild.exe produces incorrect binaryWhen does this occu... | static void Main ( string [ ] args ) { var customerId = Guid.NewGuid ( ) ; // Produces buggy code when compiled with MSBuild v14 TestMethodWithParams ( args : customerId , whatever : `` foo '' ) ; //All the calls below result correct behavior , regardless of the version of MSBuild , order and naming of parameters TestM... | MSBuild v14 compiles a semantically incorrect assembly under some rare circumstances |
C# | i do n't want to say : i want something like : Is this possible or is there also something else besides ! = . | ( trsaz ! = v1 ) & & ( trsaz ! = v2 ) & & ... trsaz ! = ( v1 , v4 , v7 , v11 ) | How do i say is not , is not |
C# | This question occurred to me when an answer was proposed to another question I asked . Suppose I have a base classwith some decent number of derived classes- let 's say more than half a dozen . Most of those derived classes share no similarity beyond what they inherit from the base class , but two of them have a simila... | public abstract class BaseClass { } public class OneOfMyDerivedClasses : BaseClass { public string SimilarProperty { get ; set ; } //Other implementation details } public class AnotherOneOfMyDerivedClasses : BaseClass { public string SimilarProperty { get ; set ; } //Other implementation details , dissimilar to those i... | How aggressively should I subclass to keep DRY ? |
C# | I would like to check in runtime that a variable of type Func < ... > is a specific class method.E.g . | class Foo { public static int MyMethod ( int a , int b ) { // ... } } Func < int , int , int > myFunc ; myFunc = Foo.MyMethod ; if ( myFunc is Foo.MyMethod ) { //do something } | How to check if a variable of type Func < ... > is a specific class method |
C# | How can I call this constructor ? I thought of but I want to avoid object creation.So is this one ok ? | public class DataField { public String Name ; public Type TheType ; public DataField ( string name , Type T ) { Name = name ; TheType = T ; } } f = new DataField ( `` Name '' , typeof ( new String ( ) ) ) ; f = new DataField ( `` Name '' , String ) ; | How to pass a type to a method ? |
C# | I am learning OOP and have a question about what is exactly happening with the code below.I have the classic Dog Animal example going . Dog inherits Animal.Both questions are based on this assignment : Animal a = new Dog ( ) ; What is actually happening when I declare an Animal and set it to a Dog reference . Is there ... | public class Animal { public string Name { get ; set ; } public virtual string Speak ( ) { return `` Animal Speak '' ; } public string Hungry ( ) { return this.Speak ( ) ; } } public class Dog : Animal { public override string Speak ( ) { return `` Dog Speak '' ; } public string Fetch ( ) { return `` Fetch '' ; } } | What is happening with inheritance in my example ? And , what is the proper terminology in c # ? |
C# | I have a XAML UserControl embedded in a WinForms/WPF Interop ElementHost control . The control is pretty simple - it 's just a dropdown with a button - here 's the entire markup : The problem is that it does n't work reliably , and far from instinctively.If I type something in the box that actually matches an item , no... | < UserControl x : Class= '' Rubberduck.UI.FindSymbol.FindSymbolControl '' xmlns= '' http : //schemas.microsoft.com/winfx/2006/xaml/presentation '' xmlns : x= '' http : //schemas.microsoft.com/winfx/2006/xaml '' xmlns : mc= '' http : //schemas.openxmlformats.org/markup-compatibility/2006 '' xmlns : d= '' http : //schema... | Why does my dropdown feel so clunky ? |
C# | I am writing a function for an item service where if the user requests for all items under a certain name it will return them all . Such as all the phones that are iPhone X 's etc.I got help to make one of the functions work where if there are more than 1 items it will return them all ( this is the third case ) : What ... | var itemsList = items.ToList ( ) ; switch ( itemsList.Count ( ) ) { case 0 : throw new Exception ( `` No items with that model '' ) ; case 1 : return itemsList ; case { } n when n > 1 : return itemsList ; } return null ; | What is the purpose of the parenthesis in this switch and case label ? |
C# | I 'm constructing arbitrary objects from DataRows using Reflection , and when the rubber finally meets the road , I need to take a value from the DataRow and assign it to the property on the object.Because DataRows can be full of types that do n't support conversion , many of these result in exceptions that have to be ... | public void Merge ( DataRow data ) { PropertyInfo [ ] props = this.GetType ( ) .GetProperties ( BindingFlags ... ) ; foreach ( PropertyInfo pi in props.Where ( p = > T_IsPrimitive ( p.PropertyType ) ) ) { object src = null ; if ( dataAsDataRow.Table.Columns.Contains ( pi.Name ) ) src = ( ( DataRow ) data ) [ pi.Name ] ... | Is there any way to test my conversions to avoid using exceptions ? |
C# | The Microsoft.Office.Interop.Word._Document interface has a method with the following signature : A few points I am having trouble understanding : A ref parameter can not have a default value.A default value has to be a constant , and Type.Missing is not.When calling this method , I can use Close ( false ) - normally a... | void Close ( ref object SaveChanges = Type.Missing , ref object OriginalFormat = Type.Missing , ref object RouteDocument = Type.Missing ) ; | Understand COM c # interfaces |
C# | I have the following snippet : It treats x @ product.Count as a literal . How can I have a character placed right before the @ symbol ? | < ul > @ foreach ( var product in Model.Products ) { < li > @ product.Name x @ product.Count < /li > } < /ul > | Why does n't razor detect this as a code block in ASP.NET MVC ? |
C# | I do n't understand the order of execution in the following code . Here the numbers that satisfied the first Where clause are ( 4 , 10 , 3 , 7 ) , and the numbers that satisfied the second Where clause are 2 and 1 , after that we have function Aggregate that subtract them and make one element from both . My question is... | var ints = new int [ ] { 2 , 4 , 1 , 10 , 3 , 7 } ; var x = ints .Where ( c = > c / 3 > 0 ) < -- ( 1 ) .Select ( s2 = > s2 + ints .Where ( c = > c / 3 == 0 ) < -- ( 2 ) .Aggregate ( ( f , s ) = > f - s ) ) .Sum ( ) ; | LINQ execution flow ( homework ) |
C# | I have encountered a performance issue in .NET Core 2.1 that I am trying to understand . The code for this can be found here : https : //github.com/mike-eee/StructureActivationHere is the relavant benchmark code via BenchmarkDotNet : From the outset , I would expect Activated to be faster as it does not store a local v... | public class Program { static void Main ( ) { BenchmarkRunner.Run < Program > ( ) ; } [ Benchmark ( Baseline = true ) ] public uint ? Activated ( ) = > new Structure ( 100 ) .SomeValue ; [ Benchmark ] public uint ? ActivatedAssignment ( ) { var selection = new Structure ( 100 ) ; return selection.SomeValue ; } } public... | Is Activating a Struct Without Storing It as a Local Variable Expected to Be Slower than Not Storing It as a Local Variable ? |
C# | We are indexing documents into Solr using Solrnet in asp.net c # project . We are having requirement where Solr DIH can not be used , so we are indexing products in certain batches to Solr using following code : With huge document size , it takes lot of time ( most of times it takes few hours ) to complete whole proces... | decimal cycleCount = ProductCount / batchSize ; for ( int i = 0 ; i < = Math.Round ( cycleCount ) ; i++ ) { var Products = Products ( batchSize , languageId , storeId ) .ToList ( ) ; solrCustomWorker.Add ( solrProducts ) ; solrCustomWorker.Commit ( ) ; } | Stop the for-loop in-between before it completes |
C# | I am working on a small project using C # and EF5.0 and I need to group some data . Let say I have table of columns in a building like shown below.I need a C # code to see the above data groupped like this : I prefer clues than the exact solution.EDIT : Below code shows my current state . I think I can find the columns... | + -- -- -- -- -- + -- -- -- -- Columns Table -- + -- -- -- + -- -- -- +| ColumnID |ColumnName|Width|Length|Height|number| + -- -- -- -- -- + -- -- -- -- -- + -- -- -+ -- -- -- + -- -- -- + -- -- -- +| 1 | C101 | 50 | 70 | 250 | 1 | | 2 | C102 | 70 | 70 | 250 | 1 | | 3 | C103 | 70 | 60 | 250 | 1 | | 4 | C104 | 90 | 70 |... | Data grouping in SQL |
C# | While refactoring some code written by someone else , I 've come across some weirdness that I do n't understand , and I 'm hoping someone can explain why it happens.What I thought would happen here would be that as brackets have the highest precedence , the assignment inside the brackets would happen first and none of ... | if ( mystring.Length ! = ( mystring = mystring.Replace ( `` ! # '' , replacement ) ) .Length ) { i = 1 ; } else if ( mystring.Length ! = ( mystring = mystring.Replace ( `` # '' , replacement ) ) .Length ) { i = -1 ; } mystring = mystring.Replace ( `` ! # '' , replacement ) ; if ( mystring.Length ! = mystring.Length ) {... | Evaluation of expressions within an if statement |
C# | A piece of C # code I got result false in code execution , but when I copy that code into WATCH window , the result is true . | var isTrue = ( new List < int > { 1,2,3 } is IEnumerable < object > ) ; | VS debug issue , who can help me to explain this below ? |
C# | Ive got what I think may be an unusual problem ( Ive searched around a lot for an answer , but I dont think Ive found one ) .I have messages that are read from a queue and depending on the message type contains a payload that needs to be deserialized into a concrete c # class . This needs to eventually be concrete ( I ... | public abstract class BaseRuleMessage < T > { public abstract Func < T , bool > CompileRule ( Rule r , T msg ) ; public T Deserialize ( ClientEventQueueMessage message ) { return JsonConvert.DeserializeObject < T > ( message.Payload ) ; } public BaseRuleMessage ( ) { RulesCompleted = new List < int > ( ) ; } public IEn... | Factory class using generics but without base class |
C# | I have textbox that I use for diagnostic purposes . The code behind is really simple : XAML : C # : How can I define that each new input is on a different line ? Because right now all errors are in just 1 long line . 14:15:00 Error 1 14:16:00 Error 2 14:17:00 Error 3Instead of readable with line breaks between each err... | < TextBox HorizontalAlignment= '' Left '' Margin= '' 640,20,0,0 '' TextWrapping= '' Wrap '' Height= '' 280 '' Width= '' 840 '' Name= '' txtDiagnostic '' IsHitTestVisible= '' True '' / > private void AddMessage ( string message ) { txtDiagnostic.Text += ( DateTime.Now.ToString ( `` hh : mm : ss : fff '' ) + `` `` + mess... | Next text input on different line |
C# | I have a class that looks like this : For the moment , I have each of the first 3 methods call SomeSpecialMethod ( ) just before these method return . I 'm going to add about 15 more methods that in the end all need to execute SomeSpecialMethod ( ) and I 'm wondering if there 's a way to say `` when any of the methods ... | public class SomeClass { public void SomeMethod1 ( ) { ... } public void SomeMethod2 ( ) { ... } public void SomeMethod3 ( ) { ... } private void SomeSpecialMethod ( SomeParameter ) { ... } } | executing a method after several methods run |
C# | Basically I have an object rotating . It is a click and drag type of rotation , but when the object is facing the -z -x corner , or bottom left corner , it has a chance of completely flipping 180 degrees the opposite way when clicked again . This is very troublesome and I even know what line this takes place in . Here ... | void OnMouseDown ( ) { Vector3 pos = Camera.main.WorldToScreenPoint ( transform.position ) ; pos = Input.mousePosition - pos ; baseAngle = Mathf.Atan2 ( pos.y , pos.x ) * Mathf.Rad2Deg ; baseAngle -= Mathf.Atan2 ( transform.right.y , transform.up.x ) * Mathf.Rad2Deg ; startRotation = transform.rotation ; } | Object flips 180 degrees on z-axis in -z and -x corner |
C# | I 've a ListView whose data I select and send to a DataGrid . I am having trouble with the quantity column of the DataGrid which I would want to calculate how many times a ListView item has been added to the said DataGrid ( I 'm currently displaying a success message when the same item is selected ) . I would also want... | < ListView x : Name= '' ItemGridView '' ItemsSource= '' { Binding Items } '' SelectedItem= '' { Binding SelectedItem } '' PreviewMouseDoubleClick= '' ItemGridView_PreviewMouseDoubleClick '' > < ListView.View > < GridView AllowsColumnReorder= '' False '' > < GridViewColumn > < GridViewColumn.CellTemplate > < DataTemplat... | How to Add a Quantity Column on a DataGrid from ListView selection in WPF |
C# | At first , I do not use dynamic , I just use the code like this , and it works well.But when I change it to dynamic，it is wrong.and I add a method like this , I build the project it show that List do not have the AsQueryable method.How to change it ? | List < Student > result2 = StudentRepository.GetStudent ( sex , age ) .ToList ( ) ; IQueryable rows2 = result2.AsQueryable ( ) ; dynamic result = GetPeopleData ( sex , age ) ; IQueryable rows = result.AsQueryable ( ) ; private dynamic GetPeopleData ( int sex , int age ) { if ( sex > 30 ) return StudentRepository.GetStu... | What is the difference between my codes when I use 'dynamic ' to use AsQueryable method ? |
C# | I am trying to post a file to an iManage server REST interface ( Apache server , java backend ? ? not sure ) . Postman works fine , but when I try it from C # .NET CORE 3.1 I get a response like so : { `` error '' : { `` code '' : `` FileUploadFailure '' , '' message '' : `` File upload failure '' } } Anyone have any i... | < PackageReference Include= '' Newtonsoft.Json '' Version= '' 12.0.3 '' / > using Newtonsoft.Json ; using System ; using System.Net.Http ; using System.IO ; using System.Text ; using System.Net.Http.Headers ; using System.Threading.Tasks ; namespace ConsoleApp1 { class Program { static async Task Main ( string [ ] args... | Can not Upload File using C # HttpClient , Postman works OK |
C# | I 'm attempting to create a JSON request to send to email service GetResponse to add a contact to a mail campaign.The format I 'm trying to achieve is for add_contactFollowing How to create JSON string in C # I contructed this setupAnd filled this like soHere json is as expectedWhat I do n't know is how to properly add... | [ `` API_KEY '' , { `` campaign '' : `` CAMPAIGN_ID '' , `` action '' : `` action_value '' , `` name '' : `` name_value '' , `` email '' : `` email_value '' , `` cycle_day '' : cycle_day_value , `` ip '' : `` ip_value '' , `` customs '' : [ { `` name '' : `` name_1_value '' , `` content '' : `` content_1_value '' } , {... | Creating a specific JSON format |
C# | I was trying to better understand string 's interning in c # and got into the following situation : I 'm getting the following result in console : True True True False The mistake for me is that why is the 4th false ? | string a = '' Hello '' ; string b = '' Hello '' ; string c = new string ( new char [ ] { ' H ' , ' e ' , ' l ' , ' l ' , ' o ' } ) ; string d = String.Intern ( c ) ; Console.WriteLine ( a==b ) ; Console.WriteLine ( c==d ) ; Console.WriteLine ( ( object ) a== ( object ) b ) ; Console.WriteLine ( ( object ) c== ( object ... | False after casting interned strings to objects |
C# | Possible Duplicate : When do you use code blocks ? Ok , this might be a stupid question and I might be missing something obvious but as I slowly learn C # this has kept nagging me for a while now.The following code obviously compiles just fine : I understand that { } blocks can be used for scoping . The question is why... | public void Foo ( ) { { int i = 1 ; i++ ; } { int i = 1 ; i -- ; } } | Benefits of scoping blocks ? |
C# | I have one array : I m looking for the index of BMW , and I using below code to get : Unfortunately it return the result for the first BMW index only . Current output : My expected output will be | string [ ] cars = { `` Volvo '' , `` BMW '' , `` Volvo '' , `` Mazda '' , '' BMW '' , '' BMW '' } ; Label1.Text = Array.FindIndex ( filterlistinput , x = > x.Contains ( `` BMW '' ) ) .ToString ( ) ; 1 { 1,4,5 } | Get the list of index for a string in an array ? |
C# | I wanted to do trim by default white-space characters and by my additional characters . And I did this by following way : As for me it is looks like stupid , because it has more iterations than it needs . Is it possible to add characters ( instead replace defaults ) for string.Trim ( ) ? Or where can I found array of '... | string MyTrim ( string source ) { char [ ] badChars = { ' ! ' , ' ? ' , ' # ' } ; var result = source.Trim ( ) .Trim ( badChars ) ; return result == source ? result : MyTrim ( result ) ; } | Is it possible to add characters ( instead replace defaults ) for string.Trim ( ) ? |
C# | Here is a seemingly simple class to sum all elements in an array : Of course this is not an efficient way to perform this task . And this is also very inefficient usage of threads . This class is written to illustrate a basic divide and conquer solution concept , and it hopefully does so.Here is also a simple unit test... | class ArraySum { class SumRange { int left ; int right ; int [ ] arr ; public int Answer { get ; private set ; } public SumRange ( int [ ] a , int l , int r ) { left = l ; right = r ; arr = a ; Answer = 0 ; } public void Run ( ) { if ( right - left == 1 ) { Answer = arr [ left ] ; } else { SumRange leftRange = new SumR... | Incorrect result with too many threads |
C# | I read a lot of articles about number format string , ex : http : //msdn.microsoft.com/en-us/library/0c899ak8.aspxI really not understand how to write the best format string . To get a excepted result , I can write some ways . Example : print number 1234567890 as a text `` 1,234,567,890 '' . These ways give the same re... | 1234567890.ToString ( `` # , # '' ) 1234567890.ToString ( `` # , # # '' ) | How to get the best number format string ? |
C# | I have these two functions which read a stream into a buffer and loads it into the given struct.I 'd like to combine these into a generic function to take either of the structs , I 'm just unsure what the proper way to do this is.Is this the correct way ? | TestStruct1 ReadRecFromStream2 ( Stream stream ) { byte [ ] buffer = new byte [ Marshal.SizeOf ( typeof ( TestStruct1 ) ) ] ; stream.Read ( buffer , 0 , 128 ) ; GCHandle handle = GCHandle.Alloc ( buffer , GCHandleType.Pinned ) ; try { return ( TestStruct1 ) Marshal.PtrToStructure ( handle.AddrOfPinnedObject ( ) , typeo... | How to make these struct functions generic ? |
C# | I recently stumbled upon an odd issue which I could not explain and I would be glad if someone could clarify why it happens.The issue I 've encountered is as follows : I have an interface which is implemented , like so : And another interface which is implemented in a different project , like so : I have an object whic... | namespace InterfaceTwo { public interface IA { } } namespace InterfaceTwo { public class A : IA { } } namespace InterfaceOne { public interface IB { } } namespace InterfaceOne { public class B : IB { } } using InterfaceOne ; using InterfaceTwo ; namespace MainObject { public class TheMainObject { public TheMainObject (... | Object instantiation fails when using overloaded constructor |
C# | So I took a look at ILDASM , inspecting a .exe which looks like this : Now , the CIL code looks like that : I understand that first b is loaded ( which is stored at [ 1 ] ) , then a constant with the value of 1 and then they are compared . What I do not understand is why another constant with the value 0 is loaded and ... | int a = 2 ; Int32 b = 1 ; if ( b == 1 ) { } IL_0005 : ldloc.1IL_0006 : ldc.i4.1IL_0007 : ceqIL_0009 : ldc.i4.0IL_000a : ceqIL_000c : stloc.2 .method private hidebysig instance void Form1_Load ( object sender , class [ mscorlib ] System.EventArgs e ) cil managed { // Code size 19 ( 0x13 ) .maxstack 2.locals init ( [ 0 ]... | What exactly does the == operator do ? |
C# | Using TPL with .NET 4 , I 'm trying to decide how to design APIs that deal with futures . One possibility that occurred to me was to mimic the async pattern but without an End ( IAsyncResult ) method : As such , callers can decide whether to call the blocking or non-blocking version of GetAge ( ) . Moreover , they have... | public Task < int > BeginGetAge ( ) { // create and return task } public int GetAge ( ) { return this.BeginGetAge ( ) .Result ; } | Does this TPL idiom exist ? |
C# | Here is some example code : Since DateTime can not be null , why does this code compile ? Edit : The issue is not just that this code will always return false , but why something like DateTime which is never null is allowed in such a comparison . | static DateTime time ; if ( time == null ) { /* do something */ } | Why is this a valid comparison |
C# | I have 2 linq statements - currently in the middle of a switch block . The statements are below.As you can see the only difference is that they refer to two different properties of `` lender '' , however , all the elements used in the linq query are identical in `` ApplicationWindows '' and `` TransferWindows '' , alth... | pwStartTime = lender.ApplicationWindows.Where ( w = > w.Name == pwPeriod & & w.EndTime.TimeOfDay > dateToCheck.TimeOfDay ) .Select ( w = > w.StartTime ) .FirstOrDefault ( ) ; pwStartTime = lender.TransferWindows.Where ( w = > w.Name == pwPeriod & & w.EndTime.TimeOfDay > dateToCheck.TimeOfDay ) .Select ( w = > w.StartTi... | Is it possible to make 1 generic method out of these 2 linq statements ? |
C# | In the following example , I have two constraints , Foobar and IFoobar < T > , on type T in generic class FoobarList < T > . But the compiler gives an error : Can not implicitly convert type 'Foobar ' to 'T ' . An explicit conversion exists ( are you missing a cast ? ) It seems the compiler considers CreateFoobar as a ... | interface IFoobar < T > { T CreateFoobar ( ) ; } class Foobar : IFoobar < Foobar > { //some foobar stuffs public Foobar CreateFoobar ( ) { return new Foobar ( ) ; } } class FoobarList < T > where T : Foobar , IFoobar < T > { void Test ( T rFoobar ) { T foobar = rFoobar.CreateFoobar ( ) ; //error : can not convert Fooba... | Priorities of multiple constraints on a generic type parameter |
C# | I wonder what is the reason for the invocation of the method that prints `` double in derived '' . I did n't find any clue for it in the C # specification . | public class A { public virtual void Print ( int x ) { Console.WriteLine ( `` int in base '' ) ; } } public class B : A { public override void Print ( int x ) { Console.WriteLine ( `` int in derived '' ) ; } public void Print ( double x ) { Console.WriteLine ( `` double in derived '' ) ; } } B bb = new B ( ) ; bb.Print... | C # Overloaded method invocation with Inheritance |
C# | In the given class I 've specified a generic as the type to extend via the this keyword . Being that I 've delayed the definition of the type until compile time , how does intellisense ( and anything else involved ) know what type I am extending ? Does C # simply default to the top level System.Object ? | public static class MyClass { public static void Print < T > ( this T theObject ) { Console.WriteLine ( `` The print output is `` + theObject.ToString ( ) ) ; } } | What are we extending when creating a generic extension method ? |
C# | I have two datatables , I am trying to copy row from one table to another , I have tried this . the thing is that my tables are not exactly the same , both tables have common headers , but to the second table have more columns , therefore I need `` smart '' copy , i.e to copy the row according to the column header name... | + -- -- -- -- + -- -- -- -- + -- -- -- -- +| ID | aaa | bbb |+ -- -- -- -- + -- -- -- -- + -- -- -- -- +| 23 | value1 | value2 | < -- -- copy this row + -- -- -- -- + -- -- -- -- + -- -- -- -- + -- -- -- -- +| ID | ccc | bbb | aaa |+ -- -- -- -- + -- -- -- -- + -- -- -- -- + -- -- -- -- +| 23 | | value2 | value1 | < --... | Copy row from datatable to another where there are common column headers |
C# | In my page load , am I calling ReturnStuff ( ) once or three times ? If I am calling it three times , is there a more efficient way to do this ? | protected void Page_Load ( object sender , EventArgs e ) { string thing1 = ReturnStuff ( username , password ) [ 0 ] ; string thing2 = ReturnStuff ( username , password ) [ 1 ] ; string thing3 = ReturnStuff ( username , password ) [ 2 ] ; } public static List < string > ReturnStuff ( string foo , string bar ) { // Crea... | Am I using Lists correctly ? |
C# | Is there a way to shrink these into just one group result ? I have a set of pages like these which simply return static content and thought there must be a more efficient way to do it . EDIT : Thanks for all the replies : ) | public ActionResult Research ( ) { return View ( ) ; } public ActionResult Facility ( ) { return View ( ) ; } public ActionResult Contact ( ) { return View ( ) ; } | Can I simplify this code for return views ? It seems very redundant |
C# | I was hoping someone might help me understand why Convert.ToDecimal when used within linq is rounding a decimal and when used outside , it does notGiven the following DB : CODE : Output | CREATE TABLE [ dbo ] . [ Widgets ] ( [ ID ] [ int ] NOT NULL , [ WidgetName ] [ varchar ] ( 50 ) NOT NULL , [ UnitsAvailable ] [ int ] NOT NULL , [ WeightInGrams ] [ decimal ] ( 10 , 6 ) NULL ) ON [ PRIMARY ] GOINSERT [ dbo ] . [ Widgets ] VALUES ( 1 , N'Best thing ever ' , 100 , CAST ( 10.000210 AS Decimal ( 10 , 6 ) ... | Why is Convert.ToDecimal returning different values |
C# | Though I can successfully do this at the top of a page : and then use a class like this later : I really would like to do this : so that I can use it like this later : but that gives me the error : The 'tagprefix ' attribute can not be an empty string.Is n't there a way to register an empty TagPrefix so it can be used ... | < % @ Register TagPrefix= '' me '' Namespace= '' MyNamespace '' % > < Usercontrol : DataRowTextBox ... > < Regexes > < me : RegularExpressionValidatorItem Type= '' USPhoneNumber '' / > < me : RegularExpressionValidatorItem Type= '' InternationalPhoneNumber '' / > < /Regexes > < /Usercontrol : DataRowTextBox > < % @ Reg... | Use an empty TagPrefix with a < % @ Register % > |
C# | I have a list of objects of the same type that each has a property that is an array of floats . Taking this list as input , what is the easiest way to return a new array that is the average of the arrays in the list ? The input objects look like this : The DataValues arrays will be guaranteed to have the same length . ... | Class MyDatas { float [ ] DataValues ; } ... List < MyDatas > InputList ; float [ ] result ; | Elegant averaging of arrays from different instances of an object in C # |
C# | After reading Stephen Cleary blog post about eliding async and await I 've decided to go and play around with it . I wrote very simple console app with HttpClient using Visual Studio For Mac.According to blog post it should throw an exception but it did n't . If I switch to Windows and try to run this app , I will get ... | public static async Task Main ( string [ ] args ) { Console.WriteLine ( await Get ( ) ) ; Console.WriteLine ( `` Hello World ! `` ) ; } public static Task < string > Get ( ) { using ( var http = new HttpClient ( ) ) return http.GetStringAsync ( `` http : //google.com '' ) ; } | Eliding async and await on HttpClient is not throwing exception on OSX |
C# | I am using Entity Framework 4.3.1 using the DbContext POCO approach against a SQL Server 2012 database . I have just two tables in the database and they look like this : NOTE : There are no foreign keys specified in the database at all - I am only enforcing the relationship in the model ( I can not change the database ... | public class Two { public long TwoId { get ; set ; } public string OneId { get ; set ; } public virtual One One { get ; set ; } } public class One { public string OneId { get ; set ; } public DateTime DeliveryDate { get ; set ; } public virtual ICollection < Two > Twos { get ; private set ; } public void AddTwo ( Two t... | Why would a datetime prevent a navigation property from getting loaded ? |
C# | I am working on some class room examples . This code works but I do not see why it works . I know that there is a generic type and that class implements Item but Item is just another class . Why would this code allow a int and double into the same list.I am sure that it has to do with the Generic but why I am not reall... | public class Item < T > : Item { } public class Item { } static void Main ( string [ ] args ) { var list = new List < Item > ( ) ; list.Add ( new Item < int > ( ) ) ; list.Add ( new Item < double > ( ) ) ; } | Why does this code work for different types ? |
C# | I am new to CSharp.I have seen `` this ( ) '' in some code.My question is Suppose if i callParemeterized constructor , am i invoking the paremeterless constructor forcefully ? .But According to constructor construction , i believe parameterless constructor will be executed first.Can you please explain this with simple ... | public OrderHeader ( ) { } public OrderHeader ( string Number , DateTime OrderDate , int ItemQty ) : this ( ) { // Initialization goes here ... . } | Using this ( ) in code |
C# | For example , if I have a class : and later create two instances of it : and call r sequentially , the r for both will give the same values . I 've read that this is because the default constructor for Random uses the time to provide `` randomness , '' so I was wondering how I could prevent this . Thanks in advance ! | public class Class { public Random r ; public Class ( ) { r= new Random ( ) } } Class a = new Class ( ) ; Class b = new Class ( ) ; | How do I have two randoms in a row give different values ? |
C# | I know other people wrote similar questions , but I think mine is a different case , since I could n't find any solution.I have an object assignment , something very simple like this : the assembly code generated is the followingnow , just for to understand what 's going on , I wanted to step inside the call ( why a ca... | _buffer3 = buffer ; //they are just simple reference types mov edx , dword ptr [ ebp-3Ch ] mov eax , dword ptr [ ebp-40h ] lea edx , [ edx+4 ] call 69C322F0 69C322F0 ? ? ? private class Test { int _X ; int _Y ; Test _t ; public void SetValues ( int x , int y , Test t ) { _X = x ; _Y = y ; } } _X = x ; 00000028 mov eax ... | Mysterious call is added when reference is assigned in c # |
C# | I have a view that displays a boolean ( currently defaulted to 0 ) in a box format in the view that I can not check to activate as true and also want to enter text in the result field to pass back to the controller and save both changes to a table . Can someone please explain what I have to do to allow this functionali... | public ActionResult P1A1Mark ( ) { List < MarkModel > query = ( from row in db.submits where row.assignment_no.Equals ( `` 1 '' ) & & row.group_no == 1 group row by new { row.assignment_no , row.student_no , row.student.firstname , row.student.surname } into g select new MarkModel { student_no = g.Key.student_no , stud... | Enable boolean and enter text in view then pass back to controller - MVC |
C# | I 've seen most people use member variables in a class like : But what 's the difference of that to this ? | string _foo ; public string foo { get { return _foo ; } ; private set { _foo = value } ; } public string foo { get ; private set ; } | Why use member variables in a class |
C# | Does anybody know how to write an extension function returning a ParallelQuery in PLINQ ? More specifically , I have the following problem : I want to perform a transformation within a PLINQ query that needs an engine , whose creation is costly and which can not be accessed concurrently.I could do the following : Here ... | var result = source.AsParallel ( ) .Select ( ( i ) = > { var e = new Engine ( ) ; return e.Process ( i ) ; } ) // helper class : engine to use plus list of results obtained in thread so farclass EngineAndResults { public Engine engine = null ; public IEnumerable < ResultType > results ; } var result = source.AsParallel... | How do I write a thread-aware extension function for PLINQ ? |
C# | In Haskell , the language I 'm most familiar with , there is a fairly precise way to determine the type of a variable . However , in the process of learning C # , I 've become somewhat confused in this regard . For example , the signature for the Array.Sort method is : Yet , this method will raise an exception if the a... | public static void Sort ( Array array ) | How do I determine the appropriate type for method parameters in C # ? |
C# | This is the xml stream : The corresponding classes look like this : the code to deserialise the xml ( the string replacement contains the xml code ) : The method stringToStreamThe result that i get is as following : The object XmlData is made and there is a list of taskEvents.The problem is in the list itself : it is e... | < ? xml version= '' 1.0 '' encoding= '' utf-8 '' ? > < historydetails > < taskEvent > < eventtype > Transitions < /eventtype > < historyevent > Task moved < /historyevent > < details > From 'Requested ' to 'In Validation ' < /details > < author > NAme < /author > < entrydate > 01 Jul 13 , 11:34 < /entrydate > < history... | deserialising does not work |
C# | I have seen people define their events like this : Can somebody explain how this is different from defining it without it ? Is it to avoid checking for null when raising the event ? | public event EventHandler < EventArgs > MyEvent = delegate { } ; | Why is this event declared with an anonymous delegate ? |
C# | This is probably a very beginner question but I have searched a lot of topics and could n't really find the same situation , although I 'm sure this kind of situation happens all the time.My project/program is going to track changes to drawings on construction projects and send notifications to people when drawings are... | public class Project { private readonly List < Drawing > _drawings = new List < Drawing > ( 30 ) ; private readonly List < Person > _autoRecepients = new List < Person > ( 30 ) ; public int ID { get ; private set ; } public string ProjectNumber { get ; private set ; } public string Name { get ; private set ; } public b... | Circular reference — architecture question |
C# | Given the code block above does not actually do anything but call the first DoSomethingElse method , what would be a clever approach to having the correct method call based on the real type of the parameters passed to the DoSomething method ? Is there a way I can get the method call resolved at runtime , or do I have t... | class Base { } class ClassA : Base { } class ClassB : Base { } public static class ExtensionFunctions { public static bool DoSomething ( this Base lhs , Base rhs ) { return lhs.DoSomethingElse ( rhs ) ; } public static bool DoSomethingElse ( this Base lhs , Base rhs ) { return true ; } public static bool DoSomethingEls... | C # enhanced Method overload resolution |
C# | Calling _thread.Join ( ) causes the GetConsumingEnumerable loop to be stuck on the last element . Why does this behavior occur ? The context for this approach is that I need to make sure that all operations are executed on one OS thread , which would allow a part of the app to use different credentials than the main th... | public abstract class ActorBase : IDisposable { private readonly BlockingCollection < Task > _queue = new BlockingCollection < Task > ( new ConcurrentQueue < Task > ( ) ) ; private readonly Thread _thread ; private bool _isDisposed ; protected ActorBase ( ) { _thread = new Thread ( ProcessMessages ) ; _thread.Start ( )... | Thread Join ( ) causes Task.RunSynchronously not to finish |
C# | In C # you are recommended to add the [ Flags ] attribute to bitmask enumerations , like so : I discovered I had code that erroneously performed bitwise operations on an enumeration without the [ Flags ] attribute that was not a bitmask at all ( First=1 , Second=2 , Third=3 , etc. ) . This was of course logically wrong... | [ Flags ] public enum Condiments { None = 0 , Ketchup = 1 , Mustard = 2 , Mayo = 4 , Pickle = 8 , AllTheWay = 15 } | Possible to prevent accidental bitwise operators on non-bitmask field ? |
C# | I 'm trying to write an extension method that , given a value , will returnThe value itself if it 's different from DBNull.ValueThe default value for value 's typeYeah , that 's not the clearest explanation , maybe some code will make what I 'm trying to accomplish obvious.As long as value 's boxed type is the same as ... | public static T GetValueOrDefault < T > ( this object value ) { if ( value == DBNull.Value ) return default ( T ) ; else return ( T ) value ; } | Casting boxed byte |
C# | I have an Item class that has a publicly accessible member NoSetter that does not contain a setter . The object does explicitly state a get , which retrieves a private readonly List object.When you create this object , you ca n't set NoSetter to a list , the compiler fails whenever you try . However if you create the l... | class Item { private readonly List < string > emptyString ; public Item ( ) { this.emptyString = new List < string > ( ) ; } public List < string > NoSetter { get { return this.emptyString ; } } } List < string > goldenString = new List < string > ( ) ; goldenString.Add ( `` Nope '' ) ; Item item = new Item ( ) { NoSet... | How does an inline list override a property with no setter ? |
C# | i have code . the constructor should enter the GetItems function but when i place breakpoint , it simply do not stop.what is the problem ? | namespace Storehouse { public partial class MainForm : Form { public MainForm ( ) { InitializeComponent ( ) ; var a = GetItems ( fILEToolStripMenuItem ) ; } public IEnumerable < ToolStripMenuItem > GetItems ( ToolStripMenuItem item ) { foreach ( ToolStripMenuItem dropDownItem in item.DropDownItems ) { if ( dropDownItem... | constructor do not enter a function C # |
C# | I ran into an issue the other day that I first believed to be an issue with Entity Framework . I posted a question about it the other day here . Since then , I have determined that this issue is not related to Entity Framework.Consider the following classes : If I add the following code to the Main method of an old Con... | public abstract class ModelBase { public Guid Id { get ; set ; } } public class User : ModelBase { public string Username { get ; set ; } } public abstract class ModelBaseConfiguration < T > where T : ModelBase { public virtual void Configure ( ) { ConfigureGuidProperty ( e = > e.Id ) ; } protected void ConfigureGuidPr... | Peculiar Issue When Using Expressions and ( Web ) Console Application |
C# | why can we have a static circular reference in struct but not a instance type circular reference ? | struct C { //following line is not allowed . Compile time error . // it 's a non static circular reference . public C c1 ; //But this line compiles fine . //static circular reference . public static C c2 ; } | Why is Circular reference in struct of instance type not allowed but circular reference of static type allowed ? |
C# | I have this model class : Then I add a few records in the database : Then I run this query : And I get : user2 Collection2 user1Why in Collection2 do I have a record ? And how to fix it ? UPDATE.This is a link to the test project https : //drive.google.com/file/d/0BxP-1gZwSGL5S1c4cWN1Q2NsYVU/view | public class User { public int Id { get ; set ; } public string Name { get ; set ; } public virtual ICollection < User > Collection1 { get ; set ; } = new List < User > ( ) ; public virtual ICollection < User > Collection2 { get ; set ; } = new List < User > ( ) ; } var context = new UsersContext ( ) ; var user1 = new ... | Strange behavior of Entity Framework |
C# | I have a variable of type Func < dynamic > and I am trying to assign it a value . If I assign it to a method that returns a value type ( e.g . int ) , I get the error 'int MethodName ( ) ' has the wrong return typeIf I wrap the method in a lambda call , however , it works fine . Also methods that return reference types... | private string Test ( ) { return `` '' ; } private int Test2 ( ) { return 0 ; } Func < dynamic > f = Test ; // WorksFunc < dynamic > g = Test2 ; // Does notFunc < dynamic > h = ( ) = > Test2 ( ) ; // Works | Ca n't assign methods that return value types to Func < dynamic > |
C# | The problem is after running Temp totals is an IEnumerable that contains a IEnumerable of a simple class of The idea is to then take this data and group it into a dictionary so that i can get a total of all of the amounts with the key being the type.The end result should look like : I know that I could just foreach it ... | reportData = dbContext.FinancialsBySupplierAuditPeriodStatusType .Where ( v = > v.ReviewPeriodID == reportFilter.ReviewPeriodID & & v.StatusCategoryID == reportFilter.StatusCategoryID ) .GroupBy ( s = > new { s.SupplierID } ) .Select ( g = > new DrilldownReportItem { SupplierID = g.Key.SupplierID , SupplierName = g.Max... | Turning an IEnumerable of IEnumerables into a dictionary |
C# | Let 's say I have a following C # interface : And SomeClass is defined as follows : Now I 'd like to define the implementation of the interface , which wo n't compile : before I change it to : Would n't it make sense that the type constraints are also `` inherited '' ( not the right word , I know ) from the interface ? | public interface IInterface < T > where T : SomeClass { void InterfaceMethod ( ) ; } public class SomeClass { public void SomeMethod ( ) ; } public class InterfaceImpl < T > : IInterface < T > { public void InterfaceMethod ( ) { T test = default ( T ) ; test.SomeMethod ( ) ; //Gives Error } } public class InterfaceImpl... | Why does a generic class implementing a generic interface with type constraints need to repeat these constraints ? |
C# | I have some values . I want to run the shift for 6 days . but after each 2 days Shift id 1 rotate to shift id 2 and again after two days shift id 2 rotate to shift id 1 and so on ... My output should be likeI am getting shift id through a foreach loop . I tried like below mentioned way but not getting a proper resul . ... | DateTime date=04/03/2015 ( date ) Total Woring days=6 ( total ) Rotation Days=2 ( rotationday ) Shift Group=S1 ( this group contain two shift id 1 and 2 ) 04/03/2015=105/03/2015=106/03/2015=207/03/2015=208/03/2015=109/03/2015=1 SqlCommand cmd2 = new SqlCommand ( `` select ShiftID from ShiftGroup where ShiftName= ' '' +... | How to iterate date in for loop ? |
C# | I 'm attempting to parse key-value pairs from strings which look suspiciously like markup using .Net Core 2.1.Considering the sample Program.cs file below ... My Questions Are:1.How can I write the pattern kvp to behave as `` Key and Value if exists '' instead of `` Key or Value '' as it currently behaves ? For example... | =============================input = < tag KEY1= '' vAl1 '' > -- -- -- -- -- -- -- -- -- -- kvp [ 0 ] = KEY1 key = KEY1 value = -- -- -- -- -- -- -- -- -- -- kvp [ 1 ] = vAl1 key = value = vAl1============================= =============================input = < tag KEY1= '' vAl1 '' > -- -- -- -- -- -- -- -- -- -- kvp [... | .Net Core Regular Expressions , Named groups , nested groups , backreferences and lazy qualifier |
C# | Hi guys I wrote a simple program that split a string in the argument into number , letter and operators , however I come across that 23x+3=8I found the output is separate into each char 2 and 3 i want to have 23 as a whole number . is there way to push 2 number together ? | foreach ( char x in args [ i ] ) { if ( char.IsNumber ( x ) ) { inter [ i ] = Convert.ToInt32 ( x ) ; Console.WriteLine ( `` { 0 } is a number `` , x ) ; } else if ( char.IsLetter ( x ) ) { apha [ i ] = x ; Console.WriteLine ( `` { 0 } is a Letter `` , x ) ; } else if ( char.IsSymbol ( x ) ) { symbol [ i ] = x ; Consol... | Separate int and char and making whole number |
C# | I am reading Concurrency in C # by Stephen Cleary in which there is an example that has puzzled me for a while . Normally the LINQ Select method requires a lambda method that returns the value for the result collection.In the book on page 30 there is an example where the lambda does n't return anything , but neverthele... | static async Task < int > DelayAndReturnAsync ( int val ) { await Task.Delay ( TimeSpan.FromSeconds ( val ) ) ; return val ; } static async Task ProcessTasksAsync ( ) { // Create a sequence of tasks Task < int > taskA = DelayAndReturnAsync ( 2 ) ; Task < int > taskB = DelayAndReturnAsync ( 3 ) ; Task < int > taskC = De... | Why does n't an async LINQ Select lambda require a return value |
C# | When going over the project source code , I stumbled upon a method and wondered about one thing . Are the following two methods EXACTLY same from the performance/memory/compiler point of view ? Is the return variable automatically created by compiler ? | public static string Foo ( string inputVar ) { string bar = DoSomething ( inputVar ) ; return bar ; } public static string Foo ( string inputVar ) { return DoSomething ( inputVar ) ; } | Is return variable automatically created by compiler ? |
C# | Scenario : I 'm trying to use Roslyn to merge a set of C # source fragments into a single code fragment.Issue : when parsing different classes with a leading comment , the comment above the first class ( SomeClass in the example ) is not preserved . For the second class ( AnotherClass ) , the comment IS preserved ... T... | using Microsoft.CodeAnalysis ; using Microsoft.CodeAnalysis.CSharp ; using Microsoft.CodeAnalysis.CSharp.Syntax ; using System.Collections.Generic ; using System.Diagnostics ; using System ; namespace roslyn01 { class Program { static void Main ( string [ ] args ) { var input = new [ ] { `` // some comment\r\nclass Som... | merging C # code with roslyn : comment disappears |
C# | I was following the guidelines by MSDN . Two questions : Have I correctly implemented the equals method ? Could someone show me how to implement GetHashCode Correctly for my class ? MSDN does x ^ y , but I ca n't do it for mine . | using System ; using System.Collections.Generic ; using System.Linq ; using System.Text ; using System.Threading.Tasks ; namespace Crystal_Message { class Person { private string firstName = '' '' ; private string lastName= `` '' ; private string phone= '' '' ; public Person ( string firstName , string lastName , strin... | C # Implementing the Equals Method Correctly and How do I implement the GetHashCode Method |
C# | I have two classes , BaseClass and Person . The Person class inherits from BaseClass . I then use the following generic method.Within the BaseClass I have a method , that invokes GetPropertyI then call this method from a unit test.When typeof ( T ) is used , BaseClass is returned . If I use item.GetType ( ) then Person... | public static PropertyInfo GetProperty < T > ( T item , Func < PropertyInfo , bool > predicate ) { return GetProperty ( typeof ( T ) , predicate ) ; } public class BaseClass { public void DoSomething ( ) { var property = GetProperty ( new Person ( ) , ( property ) = > p.Name == `` Name '' ) ; } } var person = new Perso... | Why is generic type not the correct type ? |
C# | ExampleI call the inherited ClassB constructor . I pass in a null . ToLower ( ) throws an exception on a null . I want to check for a null before that happens . How can I do this ? | public class ClassA { public ClassA ( string someString ) { } } public class ClassB : ClassA { public ClassB ( string someString ) : base ( someString.ToLower ( ) ) { } } | How do I do operations on an inherited base constructor in C # ? |
C# | what is the use of declaring like this to declare a private variablenow normally in the coding we use ID directly which in turn access the _ID which is private.How this offers more security instead of directly declaring as | private Int64 _ID ; public Int64 ID { get { return _ID ; } set { _ID = value ; } } ; public int64 ID { get ; set ; } | Private variable accessing |
C# | I 'm trying out Roslyn 's code-generation capabilities using LinqPad to run fragments . LinqPad 's .Dump ( ) extension method renders a formatted view of the object to the Result pane.The code generated by http : //roslynquoter.azurewebsites.net/ includes a lot of code that does n't seem to do much other than add bloat... | using Microsoft.CodeAnalysis ; using Microsoft.CodeAnalysis.CSharp ; using Microsoft.CodeAnalysis.CSharp.Syntax ; var syn = SyntaxFactory.ReturnStatement ( SyntaxFactory.LiteralExpression ( SyntaxKind.NullLiteralExpression ) // .WithToken ( SyntaxFactory.Token ( SyntaxKind.NullKeyword ) ) ) // .WithReturnKeyword ( // S... | Are Roslyn 's `` .WithFooToken ( ) '' calls superfluous ? |
C# | Given the following code packing four byte values into a uint.Is it possible to apply mathematical operators like * , + , / and - on the value in a manner that it can be unpacked into the correct byte equivalent ? EDIT.To clarify , if I attempt to multiply the value by another packed valueThen unpack using the followin... | private static void Pack ( byte x , byte y , byte z , byte w ) { this.PackedValue = ( uint ) x | ( ( uint ) y < < 8 ) | ( ( uint ) z < < 16 ) | ( ( uint ) w < < 24 ) ; } uint result = this.PackedValue * other.PackedValue public byte [ ] ToBytes ( ) { return new [ ] { ( byte ) ( this.PackedValue & 0xFF ) , ( byte ) ( ( ... | Mathematical operations on packed numerical values |
C# | I have this code : it outputs me : But , I thought it should be : Because Baz is overriding the method . What is happening here ? Am I missing something ? Why did the output for fooBaz.Test ( ) is `` Foo '' instead of `` Baz '' ? | using System ; namespace Test { class Program { static void Main ( string [ ] args ) { Foo foo = new Foo ( ) ; Bar bar = new Bar ( ) ; Baz baz = new Baz ( ) ; Foo fooBar = new Bar ( ) ; Foo fooBaz = new Baz ( ) ; Bar barBaz = new Baz ( ) ; foo.Test ( ) ; bar.Test ( ) ; baz.Test ( ) ; fooBar.Test ( ) ; fooBaz.Test ( ) ;... | c # 6 bug ? virtual new method strange behavior |
C# | Let 's assume , that we have the following classes : All of these classes are actually a lot longer , but also similar in the same degree . Is there a ( nice ) way of converting them all to one generic class ? The core problem is the line : because C # disallows calling parametrized ctors on generic class specializatio... | class ViewModelA { private ProxyA proxy ; public ViewModelA ( DataA data ) { proxy = new ProxyA ( data ) ; } public void DoSth ( ) { proxy.DoSth ( ) ; } public ProxyA Proxy { get { return proxy ; } } } class ViewModelB { private ProxyB proxy ; public ViewModelB ( DataB data ) { proxy = new ProxyB ( data ) ; } public vo... | Refactoring with generics |
C# | I am looking at some covariance/contravariance stuff , I have a much wider question but it all boils down to this : This does n't work , even though BaseEntity is the parent abstract class of ProductStyle , is there a way of achieving this ? | GenericRepository < BaseEntity > repo = new GenericRepository < ProductStyle > ( context ) ; | Generics - Using parent class to specify type in generics |
C# | I am having trouble with this , as I have difficulty properly formulating it too . Making it harder to google it . I will try to explain as clearly as possible . I 've simplified the code to make it clearer what my question isI have an abstract class that has methods and properties that are used by all clases that have... | public abstract class TheBaseClass { //some properties here public enum MyEnum { } // this one every class has . It is pretty much empty here . Not sure if this is best practice . //some methods here } public SpecializedClass : TheBaseClass { //some more properties here public new enum MyEnum { } //every single class h... | How to refer to an enum in the actual class rather than the base class in C # |
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