.NET 4.5 beta INotifyCompletion error

Question

After installing Visual Studio 2012 beta and nuget package "<package id="Rx_Experimental-Main" version="1.1.11111" />"
XXXAsync method has the following error.

ex) var first = await Observable.Range(1, 100).FirstOrDefaultAsync();

The error message Is :

//Error 2 'System.Reactive.Subjects.AsyncSubject<int>' does not implement 'System.Runtime.CompilerServices.INotifyCompletion' C:\Users\kap\Documents\Visual Studio 11\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs 20 25 ConsoleApplication1

Answer 1

Hi,

The awaitable pattern has changed in .NET 4.5 and a compatible version of Rx has not been released yet.

See the Await Pattern section of this blog post for more info:

http://blogs.msdn.com/b/pfxteam/archive/2012/02/29/10274035.aspx

- Dave

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http://davesexton.com/blog

Answer 2

We've shipped Rx v2.0 Beta today and will post more details tomorrow. To solve your problem, try installing the pre-release package of Rx-Main using the instructions shown here: https://nuget.org/packages/Rx-Main/2.0.20304-beta. Also read this thread for more general notes about this release and how to use it from NuGet and with the SDK installer.

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using (Microsoft.Sql.Cloud.DataProgrammability.Rx) { Signature.Emit("Bart De Smet"); }

Answer 3

> After installing Visual Studio 2012 beta

Visual Studio 11 beta ?

Answer 4

Final naming of the Visual Studio 11 product hasn't been announced yet :-). So, yes, it seems that "KapRyeong kim" made a naming prediction when posting this question.

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using (Microsoft.Sql.Cloud.DataProgrammability.Rx) { Signature.Emit("Bart De Smet"); }