.NET 4.0中的异步/等待：兼容的DLL集？

Question

I would like to use async / await syntax when targeting .NET FX 4.0.

I fetched the Microsoft.Bcl.Async.1.0.168 Nuget package.
It has the assembly Microsoft.Threading.Tasks, Version=1.0.12.0
which implements all the magic and has a reference to System.Runtime, Version=1.5.11.0 .

The System.Runtime assembly is available in the companion Nuget package Microsoft.Bcl.1.1.8 , but has a different version 2.6.8.0 in there.

As a result, its usages won't compile without special tricks and hacks.
The DLL reference does not resolve because of the version number mismatch.

So, is it possible to get a consistent set of BCL Async DLLs which reference one another by matching version numbers and which can be compiled right away?

(Tried looking in other Nuget versions or other target ilb folders, found some matching versions but they're for a different platform and with a different set of classes, eg with a duplicate Task class)

UPD: Also mind the runtime behavior: with netfx45, these assemblies get unified into runtime and work like a charm, but on a vanilla netfx40 system you'd get a System.IO.FileLoadException with Could not load file or assembly 'System.Threading.Tasks, Version=1.5.11.0, […]

Answer 1

All you need is the one Nuget package, and VS2012 or higher. (with Nuget 2.3 or higher)
https://www.nuget.org/packages/Microsoft.Bcl.Async

Nuget will install all dependencies with the correct version (unless you specify otherwise). I've done this many times, and I'll tell you right now you only need to use that one package, and if its not working there is something else wrong with your setup.

If you don't have VS2012, you can download the Express (free) version in order to use this.

If my word isnt enough, you can read the official MSDN blog on the subject.
http://blogs.msdn.com/b/bclteam/archive/2012/10/22/using-async-await-without-net-framework-4-5.aspx
http://blogs.msdn.com/b/bclteam/archive/2013/04/17/microsoft-bcl-async-is-now-stable.aspx