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C_sharp : We need to write some logs in our code . The logs are being written via a network request which logs some info ( the logger is an Http-API module ) , But we do n't want to break the whole flow if there 's an exception in the API.I do n't to use Task.Run for this kind of operation , because it 's bad.But then ... | Non awaitable as `` fire & forget '' - is it safe to use ? |
C_sharp : In some obscure way a derived class which does n't add new functionality ( yet ) behaves different from it 's base class . The derived class : MyCheckButton inherits from a ( GTK # , part of the Mono project ) CheckButton . However in the following code snippet they behave differently : The underscore in the ... | Why does this derived class behave different from it 's base class |
C_sharp : My situation : This gives me an error : Can not cast expression of type 'T ' to type 'T2 ' ( or Can not convert type 'T ' to 'T2 ' ) I understand that it is because neither T or T2 are constrained with class , but if I know - due to IsAssignableFrom - that I can use T where I need T2 , how can I convince comp... | Unconstrained type parameters casting |
C_sharp : I initialize a property within the Controller 's Constructor.I have an Action Method which reset the property again on a button click event.Following javascript code is in my view which is called when the button is clicked.My problem is when I click the button , value of property changes in the Controller . B... | C # property value does n't get modified within Javascript/ jquery |
C_sharp : Can I have two same function name with same parameters but different meaning.For example : Thank you . <code> public void test ( string name ) public void test ( string age ) | function overload |
C_sharp : When implementing the INotifyPropertyChanged interface in its most basic form , most people seem to implement it like this : :My question is : Why the extra assignment of var propertyChanged = PropertyChanged ; ? Is it just a matter of preference , or is there a good reason for it ? Surely the following is ju... | INotifyProperyChanged - why the extra assignment ? |
C_sharp : Caution , before You read the restThis question is not about POST method , redisplaying view with submited form or binding input values to controller method parameters . It 's purely about rendering the View using html helper ( HiddenFor or Hidden - both returns the same ) .I created a simple hidden field usi... | MVC @ Html.HiddenFor renders html form with no value |
C_sharp : I have written a user control , MenuItem , which inherits from a Form Label.I have a backgroundworker thread whose IsBusy property is exposed through a property in the MainForm as IsBackgroundBusy.How do I read this property from the MenuItem usercontrol ? I am currently using Application.UseWaitCursor and I ... | How do I read a property from my main form in a user control |
C_sharp : Here is the code example : Now , if there was an exception inside of loggingProvider.ReadLogs ( ) method , it will be caught and traced . But if , for example , there is no ParticipantObjects [ 0 ] , this exception wo n't be caught and traced here . It seems that it has something to do with lambda expressions... | Why was exception not caught within the closure ? |
C_sharp : I have a to rewrite a part of an existing C # /.NET program using Java . I 'm not that fluent in Java and am missing something handling regular expressions and just wanted to know if I 'm missing something or if Java just does n't provide such feature.I have data likeThe Regex pattern I 'm using looks like : ... | Regex Captures in Java like in C # |
C_sharp : I have a RavenDB 3.5 collection `` Municipalities '' with documents structured like this : Note that the districts property can also be null.Now I 'm working on a typehead feature where you can search for both municipality names and district names . So I want to ( wildcard all ) query over both fields and als... | How to do a RavenDB query over multiple ( complex structure ) fields and return the matched values ? |
C_sharp : Suppose I have a struct with just one field : This works great , until I want to do stuff like this : So , I implemented IEquatable < in T > and IComparable < in T > , but that still did n't enable any operators ( not even == , < , > = , etc . ) .So , I started providing operator overloads.For example : This ... | Do I have to define every single operator ? |
C_sharp : I 'm trying to implement a strategy pattern to allow me to allow me to apply some `` benefit '' to an `` account '' . In the code below , I ca n't add my implementation of an interface to a dictionary expecting the interface . I think it 's some kind of contravariance problem , but it feels like I should be a... | Invariant inheritance problem |
C_sharp : Can someone tell me if or what the difference of the following statements is : whenever I press += the first choice pops up when I click tab so I 've always left it . but I 'm wondering if I can just write the second . I 'm guessing that they both get compiled the same , but I 'm curious if that 's true . I '... | adding an event handler |
C_sharp : I have a methodwhich , very descriptively , executes some work on a remote machine by : Queueing a message on a message bus signalling that work should be doneA remote agent picks up the message and executes the workThe work finishes and the agent queues a message on a message bus to say that the work is done... | Is there a way to know if a Task is being awaited ? |
C_sharp : I am making my first attempt at using threads in an application , but on the line where I try to instantiate my thread I get the error 'method name expected ' . Here is my code : <code> private static List < Field.Info > FromDatabase ( this Int32 _campId ) { List < Field.Info > lstFields = new List < Field.In... | threading question |
C_sharp : I am testing the Extreme Optimization C # library , precisely the nonlinear system solvers.As an example I find that I have to pass the solver the nonlinear system in the following shape : The problem is that the system I try to solve can not be specified at design time . It is a nonlinear system composed by ... | Define a function dynamically |
C_sharp : I 'm working on some customized authentication code based on Microsoft 's membership stuff . While looking into the Profile functionality , I looked into the ProfileBase class found in System.Web.dll v4.0.30319 . There are a few class level variables that are declared as a type but then and then initialized t... | Microsoft is casting null to a type , should I ? |
C_sharp : I am creating an MVC application where I am sending an email to JIRA . I initially had it working when I had the ModelType in the view just IssueTable , but when I changed it too ModelType ViewModelClass.ViewModel it stopped working correctly.In the controller : In the view : This initially worked but I neede... | Null value error when trying to make viewmodel item equal variable |
C_sharp : I 'd like to animate a Button 's Background if the Mouse is over the Button.The Button 's Background is bound to a custom dependency property I 've created in the Code Behind of my UserControlNow if I try to animate the Button 's background by usingI get an exception that says : can not animate an immutable p... | UserControl Animate Button 's Background |
C_sharp : I 'm working on programming a basic media player , and I 'm having some trouble writing polymorphic code , which is something I 've studied , but never actually implemented before.There are four relevant classes : MediaInfo , MovieInfo , Media , and Movie . MediaInfo is an abstract base class that holds infor... | Polymorphism : Deriving from a protected member in a base class ? |
C_sharp : UPDATE May this post be helpful for coders using RichTextBoxes . The Match is correct for a normal string , I did not see this AND I did not see that `` ä '' transforms to `` \e4r '' in the richTextBox.Rtf ! So the Match.Value is correct - human error.A RegEx finds the correct text but Match.Value is wrong be... | Match.Value and international characters |
C_sharp : I am using ASP.NET MVC and EF to create a vehicle reservation app in which a user will be able to reserve multiple vehicles for one datetime , if they want . I created a stored procedure to prevent double booking of vehicles , but am having trouble figuring out how to add the results to a list . Example : I w... | How do I create a list from stored procedure results Entity Framework |
C_sharp : I have a feature that I only want to happen on Debug , but do not want to ship the dll 's that this feature requires . Is that possible to do ? I have : Of course MyAssembly is being referenced by the project . I would like MyAssembly.dll to not be shipped on a release mode . Can that be achieved ? Will using... | C # using statement inside # if DEBUG but not ship assembly |
C_sharp : I am using a fairly simple DI pattern to inject my data repository into my controller classes , and I 'm getting the CA2000 code analysis warning ( Dispose objects before losing scope ) on every one of them . I know why the warning is happening , and can usually figure out how to fix it , but in this case I c... | CA2000 and Dependency Injection |
C_sharp : In C # and its cousin languages , we always useBut you can also use ( I found this out only recently and while fooling around with the compiler ) I do not have any formal training in programming and everything is self-tought . I have been using { get ; set ; } without any thought just like we use 1 + 1 = 2 Is... | Using { set ; get ; } instead of { get ; set ; } |
C_sharp : I have an interface with methods annotated with the Pure attribute from System.Diagnostics.Contracts : I wish to iterate over the members of the interface and check if the member is pure or not.Currently I 'm not able to get any attributes from the member info : What am I missing ? Note that I do not have a c... | Check if Generic Interface Member is `` Pure '' ( has Pure Attribute ) |
C_sharp : I need to process a list of records returned from a service.However the processing algorithm for a record changes completely based on a certain field on the record.To implement this , I have defined an IProcessor interface which has just one method : And I have two concrete implementations of IProcessor for t... | How to implement usage of multiple strategies at runtime |
C_sharp : I have the following code : If I try this it throws an error : Can not convert bool ? to boolHaving searched for this this I 'm not sure why the error is thrown , where as it will allow me to doWhy am I unable to use .Any ( ) in this case - why is it classed as a nullable bool yet the count is n't a nullable ... | Why is ? .Any ( ) classed as a nullable bool ? |
C_sharp : Is it possible to use one AdControl in a Windows 8.1 app with multiple AdUnitIds ? I followed the approach from different sources on the net to get the AdControl somewhat working , but now I 've found out ( after adding an event handler to the AdControls ErrorOccurred event ) that the error code is NoAdAvaila... | How can I use an AdControl with multiple AdUnitIds ? |
C_sharp : This is confusing to me please expalin me the behaviour of this ? A declaration of a new member hides an inherited member only within the scope of the new member.CopyIn the example above , the declaration of F in Derived hides the F that was inherited from Base , but since the new F in Derived has private acc... | c # hiding confusion |
C_sharp : I have the following piece of codes.When executed , the assertion passed . However , the assertion failed when the constructor for Reg class is disabled . On a closer look , I 've found that the implicit constructor of Reg class is called before Main ( ) . If the constructor of Reg class is explicitly defined... | Implicit static constructor called before Main ( ) |
C_sharp : I have a List of custom a datatype , simplified example ( myMovies ) : Now I am trying to remove all duplicates from myMovies but ignoring TVIndex.I have tried looking at But can not figure out how to ignore TvIndex . Is this possible ? <code> public class Movie { public Int32 TVIndex ; public string MovieNam... | Select distinct from List < t > ignoring one element |
C_sharp : If I use the Resharper code cleanup function , I 'm finding my code ... is changed to ... But then Resharper makes a suggestion `` To extension method invocation '' for the Enumerable.ToList so the code goes back to ... I 've checked in the Resharper code editing options , but I ca n't see where/how I can sto... | How to stop Resharper toggling between Enumerable.ToList and Select suggestion |
C_sharp : Is there a way to get MVC4 to call different actions based on a GET variable in the URL ? For example , let 's say I have the following two actions.Is there a way I can use the following URLs to have MVC4 'choose ' which action to call ? UPDATE : I am very much aware that I can use actions / urls the way they... | Different MVC4 action based on GET variable |
C_sharp : Sample program below : This sample program represents the interfaces my actual program uses , and demonstrates the problem I 'm having ( commented out in FakeRepository ) . I would like for this method call to be generically handled by the base class ( which in my real example is able to handle 95 % of the ca... | Can you explain this generics behavior and if I have a workaround ? |
C_sharp : I 'm stuck at this problem I would really appreciate if someone can help me solve this problem.I want to add spaces for sub-folder like this format down below . ( it must be done with recursion ) I want to add spaces for sub-folder like this format down below . ( itmust be done with recursion ) <code> using S... | Start new line with spaces |
C_sharp : What happens behind the curtains when I include a function into my compiled query , like I do with DataConvert.ToThema ( ) here to convert a table object into my custom business object : and call it like thisApparently the function is not translated in to SQL or something ( how could it ) , but it also does n... | including `` offline '' code in compiled querys |
C_sharp : I 've just started using C # 4.0 ( RC ) and come up with this problem : Note , I 've never tried this actual code , but I 've just looked at the results of doing GetConstructor using debugging in VS2010This is perfect for the two first classes ( 1 and 2 ) , the first one prints an actual ConstructorInfo-objec... | Reflecting constructors with default values in C # 4.0 |
C_sharp : I have an application that loads a list of client/matter numbers from an input file and displays them in a UI . These numbers are simple zero-padded numerical strings , like `` 02240/00106 '' . Here is the ClientMatter class : I 'm using MVVM , and it uses dependency injection with the composition root contai... | Using abstraction and dependency injection , what if implementation-specific details need to be configurable in the UI ? |
C_sharp : Sometimes back I was trying the following statement in C # Does space has impact in expressions ? In what way the above statements are different ? Ramachandran <code> i+++++i // does not compile < bt > i++ + ++i // executed | Does C # has impact when evaluating /parsing expressions ? |
C_sharp : Hi , I have a problem with getting data from youtube xml : address of youtube xml : http : //gdata.youtube.com/feeds/api/videos ? q=keyword & orderby=viewCountI try this , but the program does n't go into the linq inquiry.Anyone has idea , how to solve this ? Thanks ! <code> key = @ '' http : //gdata.youtube.... | How to get data from xml , by linq , c # |
C_sharp : I 've a filename : How can i split the above filename to 4 string groups . I tried : but i 'm not getting the above required four strings <code> NewReport-20140423_17255375-BSIQ-2wd28830-841c-4d30-95fd-a57a7aege412.zip NewReport20140423_17255375BSIQ2wd28830-841c-4d30-95fd-a57a7aege412.zip string [ ] strFileTo... | Splitting a filename |
C_sharp : I am using Linux containers on the latest Windows build Windows 10 2004 and enabled WSL 2 and Docker Desktop 2.3.0.3 ( 45519 ) .I right click the docker-compose file , and select Set as Startup Project.I then hit F5 to debug.I can see the image running with docker ps however breakpoints are not being hit.I ca... | Unable to debug dotnet core GenericHost docker container |
C_sharp : I am trying to understand how inheritance works in C # . I wrote the following code : The CIL ( Common Intermediate Language ) code for the Main ( ) looks like the following : The lines in CIL that are troubling me are : After the castclass of animal to Dog type the code executes dog.OverRideMe ( ) ; . This i... | Regarding Inheritance C # |
C_sharp : I try to use trial version of third party software written C # .While I try to use its API , I face up with a strange problem.I am using visual studio 2015 and I found an interesting extended method signature in their API-SDKThe second parameter type is not exist.Never seen before in C # . I try to give a gen... | Method Parameter Without A Parameter Type In C # |
C_sharp : You can only have one View per class name in the DisplayTemplates folder as the class name is used as the name of the view.cshtml file.However , you can have two classes in a solution with the same name if they appear in different namespaces : Both try to use the DisplayTemplate defined by view : However in t... | How to handle MVC DisplayTemplates for two classes with the same name ( different namespaces ) |
C_sharp : I have many strings with numbers.I need to reformat the string to add commas after all number sequences.Numbers may sometimes contain other characters including 12-3 or 12/4e.g . `` hello 1234 bye '' should be `` hello 1234 , bye '' '' 987 middle text 654 '' should be `` 987 , middle text 654 , '' '' 1/2 is a... | C # Add comma after every number sequence in string |
C_sharp : I 'm calling the following two lines . The second line crashes . : However , if I modify the values to not have ' , ' characters and remove the NumberStyles enum it works . e.g.Am I doing something wrong ? Is this a known issue ? Is there an acceptable work-around that does n't involve hacky string manipulati... | Why does NumberStyles.AllowThousands cause an exception when passing a negative number ? |
C_sharp : i have following caseI have added a quickwatch in debug to some fields in my case : And now the strange behaviour also from quickwatch and of course the resultSo the addition of 8.39 + -0.49 does n't give me 7.9 but 8.39This code was running for 600k cases on at least two i had this behaviour the others behav... | Addition in C # .net does n't work in some cases |
C_sharp : I have business models named Product and Category like below in which I add the validations : For the view model I have created something like this : A friend of mine suggested keeping all the validations in the view model and mapping all the properties of the business model in the view model like this : I as... | What should be in my View Models ? |
C_sharp : I 'm having trouble with the Random class in .NET , I 'm implementing a threaded collection which is working fine , except for one smaller detail . The collection is a Skip list and those of you familiar with it know that for every node inserted I need to generate a new height that is < = CurrentMaxHeight+1 ,... | Problem with Random and Threads in .NET |
C_sharp : I have defined an interface in F # I would like other apps in the same appdomain to implement it so that I can call Update on any that implement the interface ( I gather the implementations in an TinyIoC container ) . The return type Async < bool > can indicate if the update succeeded or not without having to... | How to define an async f # interface that can be implemented in c # ? |
C_sharp : Is it possible to call a throwing C # function from a C++ call in a C # app such that the C++ stack is unwound properly ? Is there any documentation of this ? For example , please consider this C # code : Along with this C++ code : I tried this out , and the C # exception was caught successfully , but release... | How to call a throwing C # function from C++ in a C # app such that the C++ stack is unwound properly ? |
C_sharp : I got some old LED board to which you 'd send some text and hang it up somewhere ... it was manufactured in 1994/95 and it communicates over a serial port , with a 16-bit MS-DOS application in which you can type in some text.So , because you probably could n't run it anywhere except by using DOSBox or similar... | How would I reverse this simple-looking algorithm ? |
C_sharp : Is it possible to compare two objects without knowing their boxed types at compile time ? For instance , if I have a object { long } and object { int } , is there a way to know if the boxed values are equal ? My method retrieves two generic objects , and there 's no way to know what their inner types are at c... | Compare boxed objects in C # |
C_sharp : Problem : return all records where Jon Doe = < bus_contact > OR < bus_sponsor > .Current code returns record 1 , so what modifications are required to return records 1 and 2 using just one query ? .XMLC # Edit : This is not exactly the same problem as pointed out in the possible duplicate link . Yes , it part... | How to add OR condition in LINQ while querying XML ? |
C_sharp : I have about 20 functions with almost the same pattern , i run on array of Sites , create SiteOperation with Site object and perform some operation ( in this case with one param but sometimes there are none or more ) Is it possible to wrap this code , so i will just send action to lets say _sitesManagement wh... | similar function refactoring pattern |
C_sharp : Failed : I wish to know what is happening behind the scenes in ToString ( ) etc to cause this behavior.EDIT After seeing Jon 's Answer : Result : Same result with capital and small ' o ' . I 'm reading up the docs , but still unclear . <code> [ Test ] public void Sadness ( ) { var dateTime = DateTime.UtcNow ;... | What is causing this behavior , in our C # DateTime type ? |
C_sharp : I am instantiating a List < T > of single dimensional Int32 arrays by reflection . When I instantiate the list using : I see this strange behavior on the list itself : If I interface with it through reflection it seems to behave normally , however if I try to cast it to its actual type : I get this exception ... | Unable to cast List < int [ * ] > to List < int [ ] > instantiated with reflection |
C_sharp : I 've just seen a video-class by Jon Skeet , where he talks about unit testing asynchronous methods . It was on a paid website , but I 've found something similar to what he says , in his book ( just Ctrl+F `` 15.6.3 . Unit testing asynchronous code '' ) .The complete code can be found on his github , but I h... | Was ManuallyPumpedSynchronizationContext required in Jon Skeet 's `` TimeMachine '' async unit test framework ? |
C_sharp : I have the following piece of code : But the stringBuilder appends text MyNamespace.MyClass+CD instead of A or X . Why does this happen ? <code> delegate string CD ( ) ; void MyFunction ( ) { stringBuilder.Append ( ( CD ) delegate ( ) { switch ( whatever ) { case 1 : return `` A '' ; ... default : return `` X... | Anonymous function not returning the correct string |
C_sharp : I need to make a connection to an API using a complicated authentication process that I do n't understand.I know it involves multiple steps and I have tried to mimic it , but I find the documentation to be very confusing ... The idea is that I make a request to an endpoint which will return a token to me that... | Authentication with hashing |
C_sharp : I 'm setting up a really small Entity-Component-System example and have some problems with the component pools.Currently my entities are just IDs ( GUIDs ) which is fine.Each system has to implement the ISystem interface and is stored in a KeyedByTypeCollection . This collection makes sure , that each system ... | create performant component pooling for system loops |
C_sharp : Came across the following MS Unit Test : I have never seen the use of generics when doing Assertions . This is how i would write the Assertion : What is the difference ? When i hover over the AreNotEqual ( ) overload i am using , the method is using the overload which compares two doubles ( not sure why there... | What is the difference between these two Unit Test Assertions ? |
C_sharp : Hi I am trying to achive something like this ; if I can succeed on that , then I can visit this expression and get the GetData Method and use it for creating a dynamic sql query . I could do this by giving method name as a string however I do n't want to break the strongly type world of my developer friends.I... | Lambda expression that returns a delegate |
C_sharp : In my program i have some very long task , which should be interruptable from GUI ( WPF ) . Any advices about threading architecture ? This task looks like N thread with such code : <code> public void DoLongOperation ( ) { for ( int i=beginPoint ; i < endPoint ; i++ ) { doSomethingStupid ( dataArray [ i ] ) ;... | Threading in C # . Interruptable task |
C_sharp : I 'm writing an asp.net MVC application and decide to try Knockout.js for dynamic UI stuff . It 's a great framework it helped me so much so far . But I faced 2 problems that I ca n't solve and find any useful information on that.I 'll start with code to show you what I have and then I shall try to explain wh... | Posting Collection with Knockout.js |
C_sharp : I have two different jwt auth tokens from two different providers my api accepts , setup as so : These auth providers have access to different APIs so when a access token attempts to access a API it 's not allowed to I will throw a 403 . I accomplish this with the following policy setup I am running into the ... | Using multiple authentication schemes on policy causes signature validation failures |
C_sharp : People usually ask why they get always the same numbers when they use Random . In their case , they unintenionally create a new instance of Random each time ( instead of using only one instance ) , which of course leads to the same numbers the whole time . But in my case , I do need several instances of Rando... | Create different seeds for different instances of `` Random '' |
C_sharp : I 've been trying to learn more about the CLR and while doing so noticed that the following interface in C # will be compiled to IL that contains some kind of `` abstract interface '' .Given that declaring an interface as abstract in C # is not valid , what does it mean to allow an abstract interface at the I... | Why does an interface get emitted at the IL level as an `` abstract interface '' ? |
C_sharp : I have a DataSet with 1-3 tables , each table have a column named m_date ( string ) I want to get max value from all of them using LINQ.I know how to get each table Maximum value : but I do n't know how to get Max value from all the tables information Edit : I now have something like this which works : but I ... | Get a Maximum Date value from X tables in DataSet |
C_sharp : Is there a way to make the parameters of this extension method 'intellisensible ' from my view ? At the moment , I can get a tooltip nudge of what the parameters ( in the controller action method ) are but would love to confidently IntelliSense type the parameter names for 'safety ' . Anyway , without further... | LINQ extension method help sought II |
C_sharp : to avoid confusion I summarised some code : When I debug the code I get an InvalidCastException in Main ( ) .I know that ISpecificEntity implements IIdentifier.But obviously a direct cast from an IManager < ISpecificEntity > into an IManager < IIdentifier > does not work.I thought working with covariance coul... | How to implement generic polymorphism in c # ? |
C_sharp : I was toying with Await/Async and CancellationTokens . My code works , but what happens to the Task when it 's Cancelled ? Is it still taking up resources or is it garbage collected or what ? Here is my code : <code> private CancellationTokenSource _token = new CancellationTokenSource ( ) ; public Form1 ( ) {... | What Happens To a Task When It 's Cancelled ? |
C_sharp : I am trying to convert Ruby 's time to C # , but I am stuck now.Here 's my try : I am new to C # , and maybe this one should be easy , and I know I want to use Extensionmethods . But since functions are not 'first class ' in C # , I am stuck for now.So , what parametertype should I use for of WhatGoesHere ? <... | Convert Ruby 's times to C # |
C_sharp : I 've been testing this code at https : //dotnetfiddle.net/ : If I compile with .NET 4.7.2 I get8590917637But if I do Roslyn or .NET Core , I get8590917630Why does this happen ? <code> using System ; public class Program { const float scale = 64 * 1024 ; public static void Main ( ) { Console.WriteLine ( unche... | C # overflow behavior for unchecked uint |
C_sharp : I see some code of some guy that goes like this : What is while ( ... ) { ... } while ( ... ) statement ? is the following equivalent code ? <code> while ( ! ( baseType == typeof ( Object ) ) ) { ... . baseType = baseType.BaseType ; if ( baseType ! = null ) continue ; break ; } while ( baseType ! = typeof ( O... | unknown while while statement |
C_sharp : I 'd like to modify a source string which is looking like and transfer it into a string with slashes to use it as a folder string which has the following structure : Do you know more elegant ways to realize this , than my solution below ? I 'm not very satisfied with my for-loops . <code> `` one.two.three '' ... | Building a new path-like string from an existing one |
C_sharp : Is it possible for me to render unbundled and unminified scripts and styles for users in `` Admin '' role ? I 've searched and found how to disable bundling and minificationin Global.asax.cs Application_Start , but I want this logic to be per-user , not per app instance , so it should not only be running on a... | render unbundled assets for admin user role |
C_sharp : Background : I will be working on tools that will be dependent on a rapidly changing API and rapidly changing data model over which I will have zero control . Data model and API changes are common , the issue here is that my code must continue to work with current and all past versions ( ie 100 % backwords co... | Suggestions for change tolerance |
C_sharp : Using Reflector or DotPeek , the System.Linq.Data.Binary implementation of the equality operator overload looks like this : I must be missing something obvious , or there is a mechanism taking place of which I 'm unaware ( such as implicitly calling object == within the body ? ) . I admit , I rarely if ever n... | Referencing equality operator within equality operator implementation |
C_sharp : This might be a trivial question , but I did n't find any information about this : is it `` harmful '' or considered bad practice to make a type T implement IComparable < S > ( T and S being two different types ) ? Example : Should this kind of code be avoided , and if yes , why ? <code> class Foo : IComparab... | Implementing IComparable < NotSelf > |
C_sharp : I 've recently come across this code in a WinForm application and I ca n't figure if there is any reason to run async code inside a Task.Run that is awaited.Would n't this code do the exact same thing without the Task.Run ? <code> public async Task SaveStuff ( ) { await Task.Run ( ( ) = > SaveStuffAsync ( ) .... | Is there any reason to run async code inside a Task.Run ? |
C_sharp : In his PluralSight course Asynchronous C # 5 , Jon Skeet provides this implementation for a convenience extension method called InCOmpletionOrder : In this question , Martin Neal provides a , seemingly more elegant , implementation using yield returnBeing still somewhat new to the rigours of asynchronous prog... | Is there a reason to prefer one of these implementations over the other |
C_sharp : I 'm learning C # ( background in C++ ) , and I have a question about LINQ expressions . The following two functions both do the same thing ( near as I can tell ) . The type of Wombats is System.Data.Linq.Table < Wombat > .I 'm interested to know Which is more efficient ? Does it even matter ? Is there someth... | Compare efficiency of two different LINQ statements |
C_sharp : A discussion has come up at work : We 've got a class that has an IList . Fact is an abstract base class , and there are several concrete subclasses ( PopulationFact , GdpFact , etc ) .Originally we 'd query for a given fact in this fashion , i.e . by type : Now , however , the question 's been raised whether... | Performance of Linq query by type |
C_sharp : I have this situation ( drastically simplified ) : Here is typical implementation : So on a HexGrid , the client can make a call to get a point on a dual grid , with exactly the right type : So far so good ; the client does not need to know anything about the type how the two points relate , all she needs to ... | Expressing type relationships and avoiding long type parameter lists in C # |
C_sharp : At my work I have to maintain some C # projects . The original developer is not around anymore . Lately I noticed some strange code mostly found in situations like this : What is the 0.ToString ( ) for ? Most of the code was written under stress , so I can think of two possibilities : It 's a placeholder ( li... | Strange Exception Handling dummy instruction |
C_sharp : I thought the whole reason for Interfaces , Polymorphism , and a pattern like Inversion of Control via Dependency Injection was to avoid tight coupling , separation , modularity , and so on.Why then do I have to explicitly `` wire up '' an Interface to a concrete class like in ASP.NET ? Wo n't me having the r... | Why do I have to `` wire up '' Dependency Injection in ASP.NET MVC ? |
C_sharp : In Java I can specify generic with wildcard `` ? '' . It is possible to create a map like this one : Map < String , ? > .I 'm working with C # and I need a Dictionary < String , SomeInterface < ? > > ( where ? can be int , double , any type ) . Is this possible in C # ? EDIT : Example : I was trying to map th... | Question about generics in C # comparing to Java |
C_sharp : I 'm writing a system that underlies programmer applications and that needs to detect their access to certain data . I can mostly do so with properties , like this : Then I go in and tweak the get and set accessors so that they handle the accesses appropriately . However this requires that the users ( applica... | An `` elegant '' way of identifying a field ? |
C_sharp : I 'm building a book library app , I have a abstract book Class , two types of derived books and two Enums that will save the genre of the book.Each Book can be related to one genre or more.Now i want to save the discounts based on the book genres ( no double discounts , only the highest discount is calculate... | selecting correct list of Enums from 2 derived classes |
C_sharp : I 'm working on an engine which is meant to be configurable by the user ( not end user , the library user ) to use different components.For example , let 's say the class Drawer must have an ITool , Pencil or Brush , and an IPattern , Plain or Mosaic . Also , let 's say a Brush must have an IMaterial of eithe... | Using Generics in a non-collection-like Class |
C_sharp : I have the following action methods : When I hit submit received model in POST method is incomplete . It contains FirstName , LastName etc . But UserID is null . So I ca n't update object . What am I doing wrong here ? <code> public ActionResult ProfileSettings ( ) { Context con = new Context ( ) ; ProfileSet... | Model object incomplete when try to update |
C_sharp : Please take a look at the code . It should n't take long to have a glimpse.Since GetCourse ( ) returns a reference of _items , calling t.GetCourses ( ) .Clear ( ) ; is clearing the underlying Course-list in the Teacher instance . I want to prevent this behaviour . That is , the GetCourse ( ) would return a li... | List < T > is cleared problem |
C_sharp : I have a following design in Java ( 7 ) application : There is a method where i pass collection of objects of some type and object that I call `` predicate '' that is used to filter given collection.Predicate is an interface with one method called test - it takes an object and return a boolean value.In such s... | How to achieve similar design ( from Java ) that use interface and implementing classes , using delegates in C # |
C_sharp : I 'm trying to append some numbers to a string , that string already contains Persian character and StringBuilder always appends Persian number to the string.Even when I 'm explicitly using English numbers like ones in the above code , I still end up with Persian numbers . How can I append English numbers to ... | StringBuilder appends Persian Numbers |
C_sharp : Each item has an interface , IItem . As well as this , there is a interface known as IDrawableItem which inherits from Item.The code below , is trying to draw a drawable item , but can not as the collection this class stores accepts only IItem . You can add anything that inherits from IItem to this class , bu... | Casting and interface inheritance |
C_sharp : What ( if any ) is the upside or downside ( performance , good coding practice , garbage collection etc . ) of invoking a non-static method of a class in the manner below : as against the more `` traditional '' way ofAny thoughts would be greatly appreciated . <code> new ClassA ( ) .MethodA ( param1 , param2 ... | Invoking nonstatic methods of a class |
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