It’s done. About five months ago, we shipped our Microsoft.Bcl.Async NuGet package which provides support for the async/await keywords for pre-.NET 4.5 platforms, such as .NET 4, Silverlight 4, and Windows Phone 7.5. Of course, this includes support for portable class libraries as well.
We believe we’ve baked Microsoft.Bcl.Async enough to flip the switch and mark it as stable. This might not sound like a big deal but it is the NuGet equivalent of shipping an RTM.
Read more: Base Class Library (BCL) Blog
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