IAsyncEnumerable not working with in Visual Studio project that targets .Net 4.8

Question

When attempting to use IAsyncEnumerable, I get this error:

The type or namespace name IAsyncEnumerable<> could not be found (are you missing a using directive or assembly reference?)

How do I make this compatible with c# 8?

Answer 1

Some C# 8 and .NET Framework combination are not (and may not ever) be officially supported by Microsoft. It's dying a slow, painful death.

As of today IAsyncEnumerable<T> is only officially available for the following frameworks

• .NET Core 3.0
• .NET Platform Extensions 3.0
• .NET Standard 2.1

However, check out the following post, you might be able to mash it in

Does C# 8 support the .NET Framework?