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C# 9–Use Record types in .NET Standard 2.0

I created a small Record type in C#:

However the compiler didn’t like it:

Why? Because I was adding this code to a .NET Standard 2.0 library that doesn’t support C# 9 features.

As a reminder, a small overview:

Target framework Version C# Language Version
.NET 5 C# 9.0
.NET Core 3.x C# 8.0
.NET Core 2.x C# 7.3
.NET Standard 2.1 C# 8.0
.NET Standard 2.0 C# 7.3

I didn’t want to upgrade to .NET 5 so what are my options? Turns out, that you can work around this with a small compiler hack…

Let’s try it:

  • First you need to override the language version in the csproj file:
  • Then you should add the following code to get rid of the compiler error:
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