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C_sharp : 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... | Is there a way I can determine which row I am on in a foreach loop ? |
C_sharp : 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... | Best way in ASP.NET of configuring rows in a database to delete after a certain time |
C_sharp : 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 gi... | EF6 - not doing what I expected for .Any ( ) |
C_sharp : 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 ... | Achieving Local Runtime Immutability in C # |
C_sharp : 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 th... | Arrow rotating to face cursor needs to only do so while inside an angle made by two given directions |
C_sharp : 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 ? <code> public Expression < Func < Message , bool... | Returning Expression < > using various class properties |
C_sharp : 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 meth... | how to lock on a method content |
C_sharp : 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 g... | Comparing GenericTypeDefinition of interfaces |
C_sharp : 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... | Conventions in assignment code ? |
C_sharp : Example 1 : vsExample 2 : Is there any benefit to using the first method over the second , or vice versa ? <code> 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_sharp : 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... | Marshal - Do I need to free any resources ? |
C_sharp : 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 a... | Member selector expression combining two classes |
C_sharp : 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.... | Making a WPF project manually |
C_sharp : 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... | MSBuild v14 compiles a semantically incorrect assembly under some rare circumstances |
C_sharp : i do n't want to say : i want something like : Is this possible or is there also something else besides ! = . <code> ( trsaz ! = v1 ) & & ( trsaz ! = v2 ) & & ... trsaz ! = ( v1 , v4 , v7 , v11 ) | How do i say is not , is not |
C_sharp : 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 hav... | How aggressively should I subclass to keep DRY ? |
C_sharp : I would like to check in runtime that a variable of type Func < ... > is a specific class method.E.g . <code> 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_sharp : How can I call this constructor ? I thought of but I want to avoid object creation.So is this one ok ? <code> 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 ( )... | How to pass a type to a method ? |
C_sharp : 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 .... | What is happening with inheritance in my example ? And , what is the proper terminology in c # ? |
C_sharp : 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... | Why does my dropdown feel so clunky ? |
C_sharp : 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 is the purpose of the parenthesis in this switch and case label ? |
C_sharp : 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 h... | Is there any way to test my conversions to avoid using exceptions ? |
C_sharp : 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 ) - ... | Understand COM c # interfaces |
C_sharp : I have the following snippet : It treats x @ product.Count as a literal . How can I have a character placed right before the @ symbol ? <code> < 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_sharp : 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 q... | LINQ execution flow ( homework ) |
C_sharp : 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... | Is Activating a Struct Without Storing It as a Local Variable Expected to Be Slower than Not Storing It as a Local Variable ? |
C_sharp : 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 wh... | Stop the for-loop in-between before it completes |
C_sharp : 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 t... | Data grouping in SQL |
C_sharp : 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 an... | Evaluation of expressions within an if statement |
C_sharp : 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 . <code> var isTrue = ( new List < int > { 1,2,3 } is IEnumerable < object > ) ; | VS debug issue , who can help me to explain this below ? |
C_sharp : 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 con... | Factory class using generics but without base class |
C_sharp : 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 betwee... | Next text input on different line |
C_sharp : 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 th... | executing a method after several methods run |
C_sharp : 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 ... | Object flips 180 degrees on z-axis in -z and -x corner |
C_sharp : 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... | How to Add a Quantity Column on a DataGrid from ListView selection in WPF |
C_sharp : 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 ? <code> List < Student > result2 = StudentRepository.GetStud... | What is the difference between my codes when I use 'dynamic ' to use AsQueryable method ? |
C_sharp : 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 ... | Can not Upload File using C # HttpClient , Postman works OK |
C_sharp : 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 pr... | Creating a specific JSON format |
C_sharp : 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 ? <code> string a = '' Hello '' ; string b = '' Hello '' ; string c = new string ( new char [ ... | False after casting interned strings to objects |
C_sharp : 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 quest... | Benefits of scoping blocks ? |
C_sharp : 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 <code> string [ ] cars = { `` Volvo '' , `` BMW '' , `` Volvo '' , `` Mazda '' , '' BMW '' , '' BMW '' } ; Label1.... | Get the list of index for a string in an array ? |
C_sharp : 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 ... | Is it possible to add characters ( instead replace defaults ) for string.Trim ( ) ? |
C_sharp : 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... | Incorrect result with too many threads |
C_sharp : 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 t... | How to get the best number format string ? |
C_sharp : 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 ? <code> TestStruct1 ReadRecFromStream2 ( Stream stream ... | How to make these struct functions generic ? |
C_sharp : 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 o... | Object instantiation fails when using overloaded constructor |
C_sharp : 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 l... | What exactly does the == operator do ? |
C_sharp : 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 ,... | Does this TPL idiom exist ? |
C_sharp : 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 . <code> static DateTime time ; if ( time == null ) { /* do somet... | Why is this a valid comparison |
C_sharp : 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... | Is it possible to make 1 generic method out of these 2 linq statements ? |
C_sharp : 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 CreateFo... | Priorities of multiple constraints on a generic type parameter |
C_sharp : 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 . <code> public class A { public virtual void Print ( int x ) { Console.WriteLine ( `` int in base '' ) ; } } public class B : A { public override void Pri... | C # Overloaded method invocation with Inheritance |
C_sharp : 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 ? <code... | What are we extending when creating a generic extension method ? |
C_sharp : 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 h... | Copy row from datatable to another where there are common column headers |
C_sharp : 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 ? <code> protected void Page_Load ( object sender , EventArgs e ) { string thing1 = ReturnStuff ( username , password ) [ 0 ] ; string thing2 = ReturnStuff ( username ... | Am I using Lists correctly ? |
C_sharp : 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 : ) <code> public ActionResult Research ( ) { return View ( ) ; } public ActionResult Faci... | Can I simplify this code for return views ? It seems very redundant |
C_sharp : 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 <code> CREATE TABLE [ dbo ] . [ Widgets ] ( [ ID ] [ int ] NOT NULL , [ WidgetName ] [ varchar ] ( 50 ) NOT NULL , [ UnitsAv... | Why is Convert.ToDecimal returning different values |
C_sharp : 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 ca... | Use an empty TagPrefix with a < % @ Register % > |
C_sharp : 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... | Elegant averaging of arrays from different instances of an object in C # |
C_sharp : 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... | Eliding async and await on HttpClient is not throwing exception on OSX |
C_sharp : 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... | Why would a datetime prevent a navigation property from getting loaded ? |
C_sharp : 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... | Why does this code work for different types ? |
C_sharp : 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 wi... | Using this ( ) in code |
C_sharp : 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 a... | How do I have two randoms in a row give different values ? |
C_sharp : 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 ... | Mysterious call is added when reference is assigned in c # |
C_sharp : 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 f... | Enable boolean and enter text in view then pass back to controller - MVC |
C_sharp : I 've seen most people use member variables in a class like : But what 's the difference of that to this ? <code> 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_sharp : 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 followi... | How do I write a thread-aware extension function for PLINQ ? |
C_sharp : 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 exceptio... | How do I determine the appropriate type for method parameters in C # ? |
C_sharp : 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... | deserialising does not work |
C_sharp : 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 ? <code> public event EventHandler < EventArgs > MyEvent = delegate { } ; | Why is this event declared with an anonymous delegate ? |
C_sharp : 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 dr... | Circular reference — architecture question |
C_sharp : 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 d... | C # enhanced Method overload resolution |
C_sharp : 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 t... | Thread Join ( ) causes Task.RunSynchronously not to finish |
C_sharp : 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 logic... | Possible to prevent accidental bitwise operators on non-bitmask field ? |
C_sharp : 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 th... | Casting boxed byte |
C_sharp : 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 cr... | How does an inline list override a property with no setter ? |
C_sharp : i have code . the constructor should enter the GetItems function but when i place breakpoint , it simply do not stop.what is the problem ? <code> namespace Storehouse { public partial class MainForm : Form { public MainForm ( ) { InitializeComponent ( ) ; var a = GetItems ( fILEToolStripMenuItem ) ; } public ... | constructor do not enter a function C # |
C_sharp : 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 ... | Peculiar Issue When Using Expressions and ( Web ) Console Application |
C_sharp : why can we have a static circular reference in struct but not a instance type circular reference ? <code> 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_sharp : 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 <code> publi... | Strange behavior of Entity Framework |
C_sharp : 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 refer... | Ca n't assign methods that return value types to Func < dynamic > |
C_sharp : 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 f... | Turning an IEnumerable of IEnumerables into a dictionary |
C_sharp : 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 i... | Why does a generic class implementing a generic interface with type constraints need to repeat these constraints ? |
C_sharp : 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 prope... | How to iterate date in for loop ? |
C_sharp : 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 ? F... | .Net Core Regular Expressions , Named groups , nested groups , backreferences and lazy qualifier |
C_sharp : 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 ? <code> foreach ( char x in args [ i ]... | Separate int and char and making whole number |
C_sharp : 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 ... | Why does n't an async LINQ Select lambda require a return value |
C_sharp : 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 ? <code> public static string Foo ( string inputVar ) { str... | Is return variable automatically created by compiler ? |
C_sharp : 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 prese... | merging C # code with roslyn : comment disappears |
C_sharp : 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 . <code> using System ; using System.Collections.Generic ; using System.Linq ; usi... | C # Implementing the Equals Method Correctly and How do I implement the GetHashCode Method |
C_sharp : 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 ( ) t... | Why is generic type not the correct type ? |
C_sharp : 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 ? <code> public class ClassA { public ClassA ( string someString ) { } } public class ClassB : ClassA { public ClassB ( string some... | How do I do operations on an inherited base constructor in C # ? |
C_sharp : 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 <code> private Int64 _ID ; public Int64 ID { get { return _ID ; } set { _ID = value ; }... | Private variable accessing |
C_sharp : 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... | Are Roslyn 's `` .WithFooToken ( ) '' calls superfluous ? |
C_sharp : 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 th... | Mathematical operations on packed numerical values |
C_sharp : 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 '' ? <code> using System ; namespace Test { class Program { static void Main ( string... | c # 6 bug ? virtual new method strange behavior |
C_sharp : 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 spe... | Refactoring with generics |
C_sharp : 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 ? <code> GenericRepository < BaseEntity > repo = new GenericRepository... | Generics - Using parent class to specify type in generics |
C_sharp : 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... | How to refer to an enum in the actual class rather than the base class in C # |
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