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C_sharp : Most of the implementation complexity of the collection framework arises from the fact , that Scala can - unlike C # 's LINQ or other collection frameworks - return the `` best '' collection type for higher order functions : Why does this principle not hold for methods like seq , par , view , force ? Is there... | Can Scala collection 's seq/par/view/force be seen as a violation of the uniform return type principle ? |
C_sharp : We are building an ASP.NET project , and encapsulating all of our business logic in service classes . Some is in the domain objects , but generally those are rather anemic ( due to the ORM we are using , that wo n't change ) . To better enable unit testing , we define interfaces for each service and utilize D... | Why not lump all service classes into a Factory method ( instead of injecting interfaces ) ? |
C_sharp : I ran into a weird case where Close event of the child window propagate to the parent window and causes it to close as well . I made a minimum example as shown belowFor TestWindow there is nothing but the default WPF window generated by VSand in App.xaml.cs I override the OnStartup event and use it as a custo... | Why would Window.Close event propagate ? |
C_sharp : I have something like the following to be a key for a generic dictionary.From what I understand of EqualityComparer < T > .Default , it should see that I have implemented IEquatable < T > and therefore create an EqualityComparer on the fly . Dictionary < TKey , TValue > requires an equality implementation to ... | My IEquatable is still using Object.GetHashcode for Dictionary < T > [ ] |
C_sharp : Basically , the title says what I 'd like to do.I have a string such as the following.I 'd like to convert this into a 2-dimensional boolean array ( obviously , 0 - > false and 1 - > true ) . My current approach is removing non-linebreak-whitespace , then iterating through the lines of the string.This leaves ... | How to transform a string of 0s and 1s into a boolean array |
C_sharp : Let we have two members equal by signature , but one is static and another - is not : but such code generate brings a compiler error : Type 'Foo ' already defines a member called 'Test ' with the same parameter typesBut why ? Let we compiled that successfully , then : Foo.Test ( ) should output `` static '' n... | Why does C # compiler overload resolution algorithm treat static and instance members with equal signature as equal ? |
C_sharp : I am working through a code sample , and I just want to hear some opinions on the way that they have done things . They use plain old ADO.NET . They have a generic function called Read that brings back 1 record . Here is the code : I do n't know why : They use Func < IDataReader , T > make as part of the meth... | Creating a generic retrieval method to return 1 record |
C_sharp : I need to load a collection of items as documents in AvalonDock 2.0 . These objects inherit from an abstract class , for which I want to render a frame inside the document depending on which subclass are.This is my XAML : So far I 've achieved to show as many documents as items are in the OpenProjects collect... | How do I bind an ObservableCollection to an AvalonDock DocumentPaneGroup ? |
C_sharp : Let 's imagine we got the following : A ) Factory interface such asB ) Concrete factory such asC ) Employees family : Manager and Sales inherited from an abstract Employee . More on my simple ) architectureSome client codeI wanted to ask about some business logic architecture details . Using the architecture ... | Roles , Abstract Pattern , Loose Coupling |
C_sharp : I often need to augment a object with a property for instance . Until now ( tired of it ; ) and it 's ugly too ) I have done it this way : Is there a clever way to do this ? What I have done previously is something like this : I guess this could be done with some reflection , but I imagine there is a faster a... | How to augment anonymous type object in C # |
C_sharp : ( This question was first asked in the Ninject Google Group , but I see now that Stackoverflow seems to be more active . ) I 'm using the NamedScopeExtension to inject the same ViewModel into both the View and the Presenter . After the View have been released , memory profiling shows that the ViewModel is sti... | NamedScope and garbage collection |
C_sharp : I want to provide a set of filters for a user to pick from , and each filter will correspond to an Expression < Func < X , bool > > . So , I might want to take a dynamic list of available items ( 'Joe ' , 'Steve ' , 'Pete ' , etc ) , and create a collection of `` hard-coded '' filters based on those names , a... | LINQ : How to force a value based reference ? |
C_sharp : Following two methods ( one uses IEnumerator < int > , and other uses List < int > .Enumerator ) even though looks identical produces different results.There are couple of questions which clearly explains this behavior , you can check them here , here , and here.I still have following two doubtsWhy List.Enume... | Behavior of Reset method of List < T > .Enumerator |
C_sharp : I have an observable stream that produces values at inconsistent intervals like this : And I would like to sample this but without any empty samples once the a value has been produced : I obviously thought Replay ( ) .RefCount ( ) could be used here to provide the last known value to Sample ( ) but as it does... | Reactive Extensions ( Rx ) - sample with last known value when no value is present in interval |
C_sharp : Resharper just prompted me on this line of code : indicating that I should not say `` = false '' because bools , apparently , default to false in C # . I 've been programming in C # for over a year and a half and never knew that . I guess it just slipped through the cracks , but this leaves me wondering what ... | Is it always OK to not explicitly initialize a value if you would only be setting it to its default value ? |
C_sharp : So I 'm using SharpSVN ( SharpSvn.1.7-x86 1.7008.2243 ) and I keep running into a problem . Every time I try to use the SvnWorkingCopyClient on a repo that 's at the root of a drive ( for example say I have the D : \ drive , and it itself is a repo ) it throws a svn_dirent_is_absolute error at me.In fact the ... | Ca n't read root |
C_sharp : I have 3 classes : A , B , and CAll of these classes implement an interface IMyInterfaceI would like the interface to be defined like so : So that it can return data of type E.The type `` E '' will be a POCO object created with the Entity Framework v4.In a separate class I have : I tried putting < object > in... | C # Dependency Injection problem |
C_sharp : I was n't exactly sure how to ask this so I made an SSCCEI have this simple WCF serviceand I 'm trying to get a Winforms client to call the webservice method ; this is what I havenow on the service side , some of the properties are null as shown by the following screenshot.Why is it that the FileName has the ... | Simple WCF service , not all parameters from client making through to the service |
C_sharp : Why after starting the program will be displayed C : :Foo ( object o ) ? I can not understand why when you call C : : Foo , selects method with the object , not with int . What 's the class B and that method is marked as override ? In class C , there are two methods with the same name but different parameters... | Why overloading does not work ? |
C_sharp : What is the WPF equivalent of the following Java SWT code ? I want to create an Image from a list of RGBA values and display on a Canvas.Then draw it on a Canvas : <code> private Image GetImage ( ) { ImageData imageData = new ImageData ( imageWidth , imageHeight,32 , palette ) ; int pixelVecLoc=0 ; for ( int ... | What is the WPF equivalent of displaying an Image on a Canvas using ImageData in Java SWT |
C_sharp : I am trying to do a simple test , in which I pass in two generic objects to a test function , see if they can be cast to List < S > , and further , check if the counts of the lists are equal.The following code works : But if I uncomment the line marked with LINE MARKER 1 , I get the following error : I do not... | Can not cast a generic type to list in C # |
C_sharp : Consider this code : andQuestion 1.If I use discard instead of a variable name , does it have performance benefit ? eg . by reducing assignment operations.Question 2.Is there any way to write the MultSum smart enough so it does n't calculate the discards ! ? <code> var ( mult , sum ) = MultSum ( a , b ) ; var... | Are there any performance benefits in C # discards ? |
C_sharp : I 'm storing an update operation as thus : For example : Then I 'm trying to apply this update later ( simplified ) : However , myUpdate.Value is a DateTime , not a DateTime ? . This is because when you cast a nullable to an object , it either becomes null or boxes the value type.Since ( DateTime ? ) myUpdate... | Unboxing nullable types - workaround ? |
C_sharp : I need to inform a so-called worker thread to stop work at the next available oppertunity . Currently I 'm using something like this : The concern I have is that StopRequested is being set to True on a different thread . Is this safe ? I know I ca n't lock a boolean . Perhaps there 's a different way to infor... | Options for informing a Thread to stop |
C_sharp : I found some examples of how to create unit of work with ef4 , i have n't used di/ioc and i would like to keep things simple and this an example ( 90 % inspired ) and i think it 's ok but since i am looking at a pattern to use from now on i would like to ask an opinion one last time.And finallyAfter getting r... | Am i using correctly Unit of Work here ? ( Entityi Framework 4 POCO ) |
C_sharp : output ( 32 bit ) : output ( 64 bit ) : Storing the ints alone ( in an array ) would require about 80000 . <code> long b = GC.GetTotalMemory ( true ) ; SortedDictionary < int , int > sd = new SortedDictionary < int , int > ( ) ; for ( int i = 0 ; i < 10000 ; i++ ) { sd.Add ( i , i+1 ) ; } long a = GC.GetTotal... | Why does sortedDictionary need so much overhead ? |
C_sharp : I 'm trying to make if-else working in IL by System.Reflection and System.Reflection.Emit . This is the code which I currently have : Now , on line where I 'm marking label it throws me this exception : Object reference not set to an instance of an object.But I think it 's stupidity because that label is asso... | C # if else exception |
C_sharp : I 've gotten to a point now where I can receive responses from a client website I 've made ( for internal use in the company I work at ) on my WCF Webservice . But whenever I get a response it 's always null.I 've look around for various solutions and none of them seems to fix this issue . I have the followin... | Client Website always return Null Json String |
C_sharp : I am looking at some C # code written by someone else . Whenever a form is instantiated and then shown , the following is done . Is this correct ? Why would you use `` using '' in this context ? Additional question : Could the following code be substituted ? <code> MyForm f ; using ( f = new MyForm ( ) ) { f.... | C # : `` using '' when instantiating a form ? |
C_sharp : I would like to enable multisampling when drawing triangles like on the following picture : I found a way to do with SlimDX in another question but it does n't work in exclusive mode.Here is my code : The last line alway crashs with a D3DERR_INVALIDCALL error even if the CheckDeviceMultisampleType return alwa... | Multisampling does n't work in exclusive mode |
C_sharp : Accidently I actually wrote this method : It is working as suspected , but I was very surprised that is it allowed to use the new keyword in the return type of the method . Is there any effect/difference if i put there new or not ? Or what is the new used for ? And is this also possible in other OO-languages ... | Whats the effect of new keyword in return type of a C # method ? |
C_sharp : I have been very intriuged by design patterns lately , and specifically following correct design patterns in my classes that implement one or several interfaces.Let 's take an example . When a class implement IDisposable you should follow a specific pattern to make sure that your resources are properly cleane... | Using specific patterns to implement interfaces |
C_sharp : I 'd like to create a component , which consist from a board and its surrounding corner . The size of the board ( and therefore also of the border ) is defined at run-time . Some examples ( board is bright and border is dark ) : alt text http : //img340.imageshack.us/img340/3862/examplegw.pngThe board consist... | What data structure to use in my example |
C_sharp : I have following two approaches for same functionality - one with `` if ” condition and one with `` ? ? and casting '' . Which approach is better ? Why ? Code : UPDATEBased on the answers , following are the benefits of ? ? Increased readabilityDecreased branching deapth of program flow ( reduced cyclomatic c... | Is “ If ” condition better than ? ? and casting |
C_sharp : If i have some code like this and an error occurs in the second using statement , will the dispose method on 1st using not be called ? -- EDIT -- Also is it better to write Try / Finally block or using statement . Internally compilter will generate Try / Finally for using statement but as per coding standards... | nested using statements - which one wont get disposed |
C_sharp : Out of curiosity : This code is valid and executes : See it working on .NET FiddleBut this doesn´t even compile ( unassigned local variable ) : See it ( not ) working on .NET FiddleDateTime is a non nullable value type , so it doesn´t need to be assigned and initialized to have a value , it has a default one.... | C # Compiler - Unassigned Field and Local Variable Initial Value |
C_sharp : I 'm still trying to get my FxCop rule working.As part of this , i need to work out what methods a method calls . Previously i was using CallGraph.CallersFor ( ) ( doing it in reverse , which is my final aim anyway ) , however it appears to have the same issue i describe below.As an alternative to using the C... | How to get the method actually called by the callvirt IL instruction within FxCop |
C_sharp : Lets say I have items and have ordering : [ 2 , 3 , 1 ] to get an enumerable I expect it to be something in the lines ofbut is there a cleaner solution ? Following I have verified that work ( HimBromBeere , Domysee , qxg ) Fwi , this was for verification test : <code> items : [ { id:1 , ... } , { id:2 , ... }... | How to sort based on ordering |
C_sharp : If I had a non-anonymous class like this , I know I can use DisplayNameAttribute like this.but I haveand I use records for DataSource for a DataGrid . The column headers show up as Foo and Bar but they have to be The Foo and The Bar . I can not create a concrete class for a few different internal reasons and ... | DisplayNameAttribute for anonymous class |
C_sharp : [ this question is in the realm of Reactive Extensions ( Rx ) ] A subscription that needs to continue on application restartNow I need to serialize and deserialize the state of this subscription so that next time the application is started the buffer count does NOT start from zero , but from whatever the buff... | store retrieve IObservable subscription state in Rx |
C_sharp : For instance , along the lines of : vsWhich is better both for clarity , ease of use , and most importantly performance . <code> public bool Intersect ( Ray ray , out float distance , out Vector3 normal ) { } public IntersectResult Intersect ( Ray ray ) { } public class IntersectResult { public bool Intersect... | Is it better to use out for multiple output values or return a combined value type ? |
C_sharp : I am working with a code that contains following overloaded method in generic class : When parametrizing the class for string do I lose the possibility to call the version with generic parameter ? <code> public class A < T > { public void Process ( T item ) { /*impl*/ } public void Process ( string item ) { /... | Method overloading in generic class |
C_sharp : Consider following interfaces : I have implemented IPowerSwitch in a class like this : Now I want to implement IHeatingElement interface in this class . IHeatingElement has the same methods as IPowerSwitch . So how I can implement the SwitchOn and SwitchOff of IHeatingElement.If I try to implement something l... | How to implement multiple interfaces with same methods inhereted from parent interfaces |
C_sharp : I am trying to learn the threading in C # . Today I sow the following code at http : //www.albahari.com/threading/ : In Java unless you define the `` done '' as volatile the code will not be safe . How does C # memory model handles this ? Guys , Thanks all for the answers . Much appreciated . <code> class Thr... | Is the following C # code thread safe ? |
C_sharp : Consider this scenario.You have a repository that allows certain calls to be made on it . These calls use LINQ and could be relatively expensive in terms of the amount of data returned.Given that in my case , it 's not overly bad if the data is old - one could implement a cache , so that the large and expensi... | Caching LINQ expressions by equality |
C_sharp : I have a .NET Core console app that downloads files from an FTP server and processes them . I moved the app onto a new server , and it stopped working . Disabling Windows Firewall on the new server solves the problem , but obviously I do n't want to leave it wide open - I need a targeted way of enabling this ... | How do I allow a .NET Core console app FTP connection through Windows Firewall ? |
C_sharp : First , an example of something that works as expected : ( all code was executed in VS2008 immediate window ) So far so good . Now let 's try on an object where the interface is inherited via a base type : In the immediate window : No surprises here either . How come the following code does n't show any inter... | Why does this object 's type show no interfaces via reflection , despite implementing at least two ? |
C_sharp : I am teaching myself C # ( I do n't know much yet ) . In this simple example : Intuitively I understand why the GetType ( ) method would throw an exception . The instance n is null which would explain that but , why do n't I get an exception for the same reason when using n.GetHashCode ( ) and ToString ( ) ? ... | why does n.GetHashCode ( ) work but n.GetType ( ) throws and exception ? |
C_sharp : I just saw this question : Is it safe to use static methods on File class in C # ? . To summarize OP has an IOException because file is in use in this ASP.NET code snippet : My first thought has been it 's a simple concurrent access issue because of multiple ASP.NET overlapping requests . Something I 'd solve... | Is `` sequential '' file I/O with System.IO.File helper methods safe ? |
C_sharp : Hi I am trying to send a simple HTTP message from Flex to C # server , but it seems that I am getting tow calls , first is the real one and the second is an empty one.Why is that and how can I handle it ? This is my C # code : this is the SocketHandler : And this is my flex code : I am always getting 2 calls.... | Handle http fired by Flex in C # server |
C_sharp : I am writing a small logger and I want to open the log file once , keep writing reactively as log messages arrive , and dispose of everything on program termination.I am not sure how I can keep the FileStream open and reactively write the messages as they arrive.I would like to update the design from my previ... | Write to open FileStream using reactive programming |
C_sharp : I was looking through some code today and saw something like the following : When I asked why it was so , since Resharper confirmed that all the casts are redundant , I was told that the Designer done it that way and they had copied that.I had a look and sure enough the Designer generates code the same as abo... | Why does the Windows Forms Designer cast int to byte then back to int for FromArgb ? |
C_sharp : I have a simple loop for : I would like to do DoSomething ( 1 ) in processor thread 1 , DoSomething ( 2 ) in thread 2 ... DoSomething ( 8 ) in thread 8 . Is it possible ? If yes than how ? Thanks for answers . <code> for ( int i = 1 ; i < = 8 ; i++ ) { DoSomething ( i ) ; } int nopt = 8 ; //number of processo... | Using Multi-core ( -thread ) processor for FOR loop |
C_sharp : So I just came across this very odd scenario and was wondering if anyone might know what the problem is . I have the following EF Linq query.When I inspect that query in the debugger it shows the following SQLIf I run that in SQL Server Management Studio substituding @ p__linq__0 with the value of dashboardId... | EF returning different values than query |
C_sharp : I am going to create a `` long '' ( Int64 ) surrogate which has to be atomic , so its copy in a concurrent application will be inherently safe . I can not use an Int32 because it spans too short as range.I know that the atomicity should be guarantee as long the involved data can fit in a double-word ( 32 bits... | Is it atomic this `` Int64 '' surrogate ? |
C_sharp : We have an application running with .Net Framework 4.6.1 that access to Linkedin calling to the endpoint : It was working until past 2020/07/14 after that it started failing in all of our environments with the following error : An error occurred while sending the request.The underlying connection was closed :... | Underlying connection was closed with linkedin |
C_sharp : While writing some code handling assemblies in C # I noticed inconsistencies in field values of Assembly object ( example of System assembly ) : but when accessing CultureName field of AssemblyName object directly , its value is an empty string : When I run the same test on Linux ( mono 3.99 ) I got another r... | CultureName of System assembly in .NET |
C_sharp : i wanted to try the following code : but it occured runtime error occasionly in following situation i. m.terms == null ii . m.terms ! = null , but m.terms [ 0 ] does not intialized . iii . m.terms ! = null , and m.terms [ 0 ] has been exist but m.terms [ 0 ] .label does not initialized ... .so i did modify it... | more short code about if statement |
C_sharp : I have an array of tasks and I am awaiting them with Task.WhenAll . My tasks are failing frequently , in which case I inform the user with a message box so that she can try again . My problem is that reporting the error is delayed until all tasks are completed . Instead I would like to inform the user as soon... | How can I await an array of tasks and stop waiting on first exception ? |
C_sharp : I need to calculate PI with predefined precision using this formula : So I ended up with this solution.So this works correct , but I faced the problem with efficiency . It 's very slow with precision values 8 and higher.Is there a better ( and faster ! ) way to calculate PI using that formula ? <code> private... | Calculate PI using sum of inverse squares |
C_sharp : I 'm trying to create an Rx operator that seems pretty useful , but I 've suprisingly not found any questions on Stackoverflow that match precisely . I 'd like to create a variation on Throttle that lets values through immediately if there 's been a period of inactivity . My imagined use case is something lik... | Custom Rx operator for throttling only when there 's a been a recent value |
C_sharp : In the following I get a compile time error that says `` Use of unassigned local variable 'match ' '' if I just enter string match ; but it works when I use string match = null ; So what is the difference and in general , if a string is not being assigned a value right away should I be assigning to null like ... | What does assigning variable to null do ? |
C_sharp : I am using VS2010 SP1.After creating a demo project for C # Form application , my solution structure has the following informationHere is the question , I can see the Form1 is a partial class . However , how does the compiler know where to find the another part of it ? *In other words , is there a binding bet... | C # - How does the compiler find the another part of the partial class ? |
C_sharp : Below is a simple program that with a small change , makes a significant performance impact and I do n't understand why.What the program does is not really relevant , but it calculates PI in a very convoluted way by counting collisions between two object of different mass and a wall . What I noticed as I was ... | Surprisingly different performance of simple C # program |
C_sharp : While I am testing post increment operator in a simple console application , I realized that I did not understand full concept . It seems weird to me : The output has been false . I have expected that it would be true . AFAIK , at line 2 , because of the post increment , compiler does comparison and assigned ... | C # Post Increment |
C_sharp : I have a need to keep track of a task and potentially queue up another task after some delay so the way I 'm thinking of doing it looks something like this : My question is , if I do something like this , creating potentially long chains of tasks is will the older tasks be disposed or will they end up stickin... | Chaining tasks with delays |
C_sharp : The implementation of Volatile.Read merely inserts a memory barrier after the read : Thus , usage of the method like so ... ... would be equivalent to : Given the above , would n't the resulting behavior be identical if the parameter was not a ref ? I guess that the ref parameter was used simply to prevent pr... | Why does Volatile.Read take ref parameter ? |
C_sharp : Suppose I am developing an application for a product distributor in C # .The distributor does the following 3 types of transactions : ( 1 ) Indent ( 2 ) Sell ( 3 ) StockI am designing my classes as follows : Now if I want to save these three types of information in three separate tables then how should I desi... | OO Design vs Database Design |
C_sharp : Note : This is more of a logic/math problem than a specific C # problem.I have my own class called Number - it very simply contains two separate byte arrays called Whole and Decimal . These byte arrays each represent essentially an infinitely large whole number , but , when put together the idea is that they ... | How to carry number from decimal to whole byte array |
C_sharp : I noticed a few questions about finding the nth occurrence of a character in a string . Since I was curious ( and have several uses for this in an application , but mainly out of curiosity ) , I coded and benchmarked two of these methods in Visual Studio 2010 , and I 'm wondering why method 1 ( FindNthOccurre... | Why is one method for finding the position of the nth occurrence of a character in a string much faster than another ? |
C_sharp : I have a linq query for project euler problem 243 : The problem is , for prime factors 2 and 3 , it produces the y = { 6 , 6 } where it needs to just be { 6 } .Is there a way to do this without calling y.Distinct ( ) or y.Contains ( ) multiple times ? I also thought about using two foreach loops , but the pro... | Linq query that automatically excludes duplicates ( one-liner ) |
C_sharp : I am using CultureInfo.CurrentCulture when formating my strings using string.formatTo quote this blog This just has the implication that if you are using CurrentCulture a lot , it might be worth reading it into a private variable rather than making lots of calls to CultureInfo.CurrentCulture , otherwise you '... | performance consideration when using properties multiple times |
C_sharp : I was wondering what were the best practices for making a query in sql with a dynamic value , lets say i have a Value ( nvarchar ( max ) ) value : `` 912345678 '' value : `` Michael '' value : `` Street number 10 '' This approuches are a bit slow since searching for a number that has 9 digits would be faster ... | SQL Server and performance for dynamic searches |
C_sharp : This code does not compile with the latest C # compiler : When you attempt to compile it , it raises ( 3,22,3,29 ) : Error CS0119 : 'IntEnum ' is a type , which is not valid in the given contextStrangely , changing the casted value to a positive number ( such as 4 ) , or using a const value ( such as int.MinV... | Why is n't the C # compiler able to cast a literal negative value to an enum ? |
C_sharp : I 'm trying to query an Elasticsearch index from C # via Elasticsearch.net ( not NEST ) . Specifically , I need to get all documents with a status of `` success '' that have been created since a specific date . In an attempt to do this , I have : I 'm not sure what to use for the range part . In fact , I 'm n... | Elasticsearch.net - Range Query |
C_sharp : Would the following method ensure that only one thread can read an ID at a time ? I have a parallel process which uses the following method and I need it to return unique IDs . Unfortunately I can not change the way the ID is structured . <code> private static int Seq = 0 ; private static long dtDiff = 0 ; pr... | Lock an object that creates ID |
C_sharp : Using Identity Serve 4 with .Net Core 3.1 , razor pages . Also using Cookie AuthenticationProblem -In a web application John logged-in 2 times1st Login on Chrome2nd Login on edgeSo , if John again trying to logged-in on 3rd time on Firefox without logout from previous browsers , then I want to logout John fro... | How to Logout user from a particular session Identity Server 4 , .Net Core ? |
C_sharp : I have a class Person , and created an equality comperer class derived from EqualityComparer < Person > . Yet the default EqualityComparer does n't call the Equals function of my equality comparerAccording to MSDN EqualityComparer < T > .Default property : The Default property checks whether type T implements... | EqualityComparer < T > .Default does n't return the derived EqualityComparer |
C_sharp : I used this pattern in a few projects , ( this snipped of code is from CodeCampServer ) , I understand what it does , but I 'm really interesting in an explanation about this pattern . Specifically : Why is the double check of _dependenciesRegistered.Why to use lock ( Lock ) { } .Thanks . <code> public class ... | Explain the code : c # locking feature and threads |
C_sharp : If an object realizes IDisposable in C # one can writeI 've always wondered why the using looks like a C # keyword , but requires an interface defined in the .Net framework . Is using a keyword ( in this context , obviously it is for defining your library imports ) , or has Microsoft overloaded it 's use in V... | Is 'using ' a C # keyword ? |
C_sharp : i try to confirm a sale and i need sum information about the product..my Viewi tryed with the ' $ .getJSON ' like this : and on the controllerbut i dont know how to return it to the onclick confirm msg or into my ViewModel..any help ? <code> @ using ( Html.BeginForm ( ) ) { @ Html.ValidationSummary ( true ) <... | Getting information from my controller into onclick confirm ( alert ) |
C_sharp : I recently asked a question here , and someone provided this answer : What is that = > doing ? It 's the first time I 'm seeing this . <code> private void button1_Click ( object sender , EventArgs e ) { var client = new WebClient ( ) ; Uri X = new Uri ( `` http : //www.google.com '' ) ; client.DownloadStringC... | What is the symbol `` = > '' doing after my method in this C # code ? |
C_sharp : EDIT Additional options and a slightly extended question below.Consider this contrived and abstract example of a class body . It demonstrates four different ways of performing a `` for '' iteration.EDIT : Addition of some options from answers and research.My question comes in two parts . Have I missed some si... | When to use which for ? |
C_sharp : In the spirit of polygenelubricants ' efforts to do silly things with regular expressions , I currently try to get the .NET regex engine to multiplicate for me.This has , of course , no practical value and is meant as a purely theoretical exercise.So far , I 've arrived at this monster , that should check if ... | Multiplication with .NET regular expressions |
C_sharp : For ex : <code> public static Domain.Recruitment.Recruitment Map ( this Data.Recruitment dv ) { //some code return new Domain.Recruitment.Recruitment { } } | Why do we put `` this '' in front of a parameter ? |
C_sharp : I 'm trying to make instance of class EndpointAddress where parameter contains German umlaut . For example : It always throws exception that given uri can not be parsed . I have tried to replace the umlaut with an encoded value , but I get same exception : Invalid URI : The hostname could not be parsed.Did an... | German umlauts in EndpointAddress with net.tcp |
C_sharp : I 'm creating an application that enables a user to insert , update and delete data that has been entered and then shown in a data-grid ( CRUD operations ) .In my View Model , it contains properties which are bound to the xaml ( Firstname for example ) . It also contains a navigation property as well as valid... | Is this correct way to implement MVVM ? |
C_sharp : The following raises complaints : but I ca n't imagine where this would n't be type-safe . ( snip* ) Is this the reason why this is disallowed , or is there some other case which violates type safety which I 'm not aware of ? * My initial thoughts were admittedly convoluted , but despite this , the responses ... | Why does the variance of a class type parameter have to match the variance of its methods ' return/argument type parameters ? |
C_sharp : There is a table called UserFriends that holds records for users ' friendships.For each friendship , there is just one record , which is equal in terms of business logic tobut both ca n't happen for one pair.What is the most efficient ( yet readable and not involving plain SQL ) Entity Framework query to dete... | What is an efficient Entity Framework query to check if users are friends ? |
C_sharp : When trying to get properties accessors from derived properties or use CanRead / CanWrite , for some reason base auto-properties are not taken into account.CanRead and CanWrite return values based only on the derived type , also GetMethod and SetMethod do n't contain methods from base type.However when writin... | Why do CanRead and CanWrite return false in C # for properties with overridden accessors ? |
C_sharp : I have the following C # Code ( I reduced it to the bare minimum to simplify it ) . Visual Studio 2019 , .NET Framework 4.7.2.From my understanding , there is nothing wrong about it . The function may fail ( I do n't want to catch it ) but before leaving , it will report successful execution to another method... | Visual Studio IDE0059 C # Unnecessary assignment of a value bug ? |
C_sharp : The String.Contains method looks like this internallyThe IndexOf overload that is called looks like thisHere another call is made to the final overload , which then calls the relevant CompareInfo.IndexOf method , with the signatureTherefore , calling the final overload would be the fastest ( albeit may be con... | Why does n't String.Contains call the final overload directly ? |
C_sharp : Being mainly a Java developer , I was a bit surprised by the result when I one day accidentally used new keyword instead of override.It appears that the new keyword removes the `` virtualness '' of the method at that level in the inheritance tree , so that calling a method on an instance of child class that i... | What is the use case for C # allowing to use new on a virtual method ? |
C_sharp : Given these type declarations , what part of the C # specification explains why the last line of the following code fragment prints `` True '' ? Can developers rely on this behavior ? Note that if the T type parameter in ICloneable were not declared out , then both lines would print `` False '' . <code> inter... | Does I < D > re-implement I < B > if I < D > is convertible to I < B > by variance conversion ? |
C_sharp : Consider the following code : If you run this code inside a .NET 4.7.2 console application , you will get the following output : I do understand that the differences in the output arise from the fact that SetValueInAsyncMethod is not really a method , but a state machine executed by AsyncTaskMethodBuilder whi... | ExecutionContext does not flow up the call stack from async methods |
C_sharp : So I have the following code in C # : The app.Use ( ) is defined as Owin.AppBuilderUserExtensions.Use ( ) and looks like this : public static IAppBuilder Use ( this IAppBuilder app , Func < IOwinContext , Func < Task > , Task > handler ) ; The VB equivalent is as follows : For some reason , in the VB version ... | C # function uses extension function but VB equivalent does not ? |
C_sharp : I was recently looking at wrapper classes and googled the following page ... http : //wiki.developerforce.com/page/Wrapper_ClassWhile I understood wrapper classes , I was baffled by the following ... and in particular ... What is that select and from ? Where can I look at more info for this in the foreach ? I... | Foreach with a select/from in square brackets ? |
C_sharp : I 'm trying to apply Specification pattern to my validation logic . But I have some problems with async validation.Let 's say I have an entity AddRequest ( has 2 string property FileName and Content ) that need to be validated.I need to create 3 validators : Validate if FileName does n't contains invalid char... | Specification pattern async |
C_sharp : I want to write a regexp to get multiple matches of the first character and next three digits . Some valid examples : A123 , V322 , R333.I try something like thatbut it gets me just the first match ! Could you possibly show me , how to rewrite this regexp to get multiple results ? Thank you so much and Have a... | RegExp multiply matches in text |
C_sharp : I 'm working on a LightSwitch custom control that is able ( well , at least this is intended ... ) to bind to and edit various different properties , based on a discriminating value.Let me explain a bit further . The table looks like this : Now , based on the value of Datenformat , the control binds itself dy... | Why is my custom control always read-only ? |
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