How Can I Implement Async-Await in .NET Framework 4.0?

Implementing Async-Await in .NET Framework 4.0

Compiler Selection:

To leverage async-await in .NET 4.0, you can choose among several options:

• VS2010 with AsyncCTP: This setup is no longer recommended due to potential code generation bugs.
• VS2012 Preview (or final): Targeting .NET 4.0 with VS2012 Preview provides a newer code generator with fewer bugs.
• Mono: Mono 2.12 does support async-await, but it may lack some features and optimizations compared to Microsoft's implementation.

Runtime Selection:

Considering the target platform of .NET 4.0, you should select the following runtime:

Microsoft.Bcl.Async (Async Targeting Pack): This official NuGet package from Microsoft provides a compatible async runtime for .NET 4.0. It offers stable and reliable async support.

Deployment Options:

For distributing your application, you can opt for the following deployment strategies:

• Same Directory: Place the Microsoft.Bcl.Async DLL alongside your application's executable for easy deployment.
• Cross-Platform Compatibility: If you require support for Mono on non-Windows platforms, ensure your application targets Mono's built-in async runtime or uses a compatible third-party implementation.

Recommended Approach:

As outlined by the answer provided by the expert, the best solution for targeting XP and leveraging async-await in .NET 4.0 is to utilize:

• Visual Studio 2012 C#5 for the compiler
• Async Targeting Pack (Microsoft.Bcl.Async) as the async runtime

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