Task does not contain a definition for GetAwaiter

Question

Client  iGame Channel   new ChannelFactory lt iGame gt    new BasicHttpBinding   BasicHttpSecurityMode   None     new EndpointAddress   new Uri    http   localhost 58597 Game svc          CreateChannel       public Task lt SerializableDynamicObject gt  Client   SerializableDynamicObject Packet         return Task lt SerializableDynamicObject gt    Factory   FromAsync   Channel   BeginConnection   Channel   EndConnection   Packet   null        Contract       OperationContract   AsyncPattern   true        IAsyncResult BeginConnection   SerializableDynamicObject Message   AsyncCallback Callback   object State         SerializableDynamicObject EndConnection   IAsyncResult Result      Service  public IAsyncResult BeginConnection   SerializableDynamicObject Message   AsyncCallback Callback   object State         dynamic Request   Message      dynamic Response   new SerializableDynamicObject          if   Request   Operation    test                  Response   Status   true            Response   Status   false       return new CompletedAsyncResult lt SerializableDynamicObject gt    Response       public SerializableDynamicObject EndConnection   IAsyncResult Result         return   Result as CompletedAsyncResult lt SerializableDynamicObject gt      Data      Exposing Service from Silverlight Client  private async void myButton   object sender   RoutedEventArgs e         dynamic Request   new SerializableDynamicObject          Request   Operation    test        var task   Client   Request        var result   await task       lt ------------------------------ Exception     Exception  Task lt SerializableDynamicObject  gt  does not contain a definition for  GetAwaiter    What s wrong      Edit 1    Briefly     Visual studio 2012 RC Silverlight 5 Application consumes Game WCF 4 Service hosted in ASP net 4 Application with ChannelFactory technique via Shared Portable Library  NET4 SL5 contains the iGame interface with Async CTP  Graph   ASP NET  lt   Class Library   Game    lt   Portable Library   iGame      Silverlight     Edit 2     Microsoft CompilerServices AsyncTargetingPack Silverlight5 dll is added in my SL5 Client using System   Threading   Tasks

User · Answer

Make sure your  NET version 4 5 or greater

User · Answer

Just experienced this in a method that executes a linq query   public async Task lt Foo gt  GetSomething         return await  from foo in Foos                   select foo  FirstOrDefault        Needed to use  FirstOrDefaultAsync   instead  N00b mistake

User · Answer

If you are writing a Visual Studio Extension  VSIX  then ensure that you have a using statement for Microsoft VisualStudio Threading  as such  using Microsoft VisualStudio Threading

User · Answer

You have to install Microsoft Bcl Async NuGet package to be able to use async await constructs in pre- NET 4 5 versions  such as Silverlight 4 0    Just for clarity - this package used to be called Microsoft CompilerServices AsyncTargetingPack and some old tutorials still refer to it   Take a look here for info from Immo Landwerth

User · Answer

In my case just add using System  solve the issue

User · Answer

public async Task lt model gt  GetSomething int id        return await context model FindAsync id

User · Answer

I had this problem because I was calling a method  await myClass myStaticMethod myString     but I was setting myString with   var myString   String Format  some dynamic-type values     which resulted in a dynamic type  not a string  thus when I tried to await on myClass myStaticMethod myString   the compiler thought I meant to call myClass myStaticMethod dynamic myString    This compiled fine because  again  in a dynamic context  it s all good until it blows up at run-time  which is what happened because there is no implementation of the dynamic version of myStaticMethod  and this error message didn t help whatsoever  and the fact that Intellisense would take me to the correct definition didn t help either   Tricky   However  by forcing the result type to string  like    var myString   String Format  some dynamic-type values     to   string myString   String Format  some dynamic-type values     my call to myStaticMethod routed properly

User · Answer

I had the same issue  I had to remove the async keyword from the method and also remove the await keyword from the calling method to use getawaiter   without any error

User · Answer

I had this issue in one of my projects  where I found that I had set my project s  Net Framework version to 4 0 and async tasks are only supported in  Net Framework 4 5 onwards   I simply changed my project settings to use  Net Framework 4 5 or above and it worked

User · Answer

GetAwaiter    that is used by await  is implemented as an extension method in the Async CTP  I m not sure what exactly are you using  you mention both the Async CTP and VS 2012 RC in your question   but it s possible the Async targeting pack uses the same technique   The problem then is that extension methods don t work with dynamic  What you can do is to explicitly specify that you re working with a Task  which means the extension method will work  and then switch back to dynamic   private async void MyButtonClick object sender  RoutedEventArgs e        dynamic request   new SerializableDynamicObject        request Operation    test        Task lt SerializableDynamicObject gt  task   Client request       dynamic result   await task          use result here     Or  since the Client   method is actually not dynamic  you could call it with SerializableDynamicObject  not dynamic  and so limit using dynamic as much as possible   private async void MyButtonClick object sender  RoutedEventArgs e        var request   new SerializableDynamicObject        dynamic dynamicRequest   request      dynamicRequest Operation    test        var task   Client request       dynamic result   await task          use result here

User · Answer

The Problem Occur Because the application I was using and the dll i added to my application both have different Versions   Add this Package- Install-Package Microsoft Bcl Async -Version 1 0 168  ADDING THIS PACKAGE async Code becomes Compatible in version 4 0 as well  because Async only work on applications whose Versions are more than or equal to 4 5

User · Answer

In case it helps anyone  the error message    does not contain a definition for  GetAwaiter   etc   also occurs if the await is incorrectly placed before the variable like this   instead of  RtfAsTextLines   await OpenNoUserInterface FilePath

User · Answer

You could still use framework 4 0 but you have to include getawaiter for the classes   MethodName parameters  ConfigureAwait false  GetAwaiter   GetResult

[c#] Task<> does not contain a definition for 'GetAwaiter'

Examples related to c#

Examples related to wcf

Examples related to silverlight-5.0

Examples related to async-ctp