C# 9 top-level programs and target-typed expressions

Re:C# 9 top-level programs and target-typed expressions by nycdotnet on Tuesday March 30, 2021 @05:48PM (#26640998)

We use C# 9 in our WebForms monolith and it works fine. Just add `<LangVersion>latest</LangVersion>` to your .csproj file. (This assumes you're using recent Visual Studio version and use a recent version of MSBuild as well)

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Re:C# 9 top-level programs and target-typed expressions by linknoid on Wednesday March 31, 2021 @07:11AM (#26645772)

There are a few language features which require a specific type to be defined, but you can define those types yourself.

For example, to use record syntax, you need to define this attribute:

    namespace System.Runtime.CompilerServices { public class IsExternalInit : Attribute { } }

And supporting the new indexing syntax requires you to define System.Index and System.Range types, which are a bit more involved, but still pretty trivial:

https://docs.microsoft.com/en-us/dotnet/api/system.index?vie... https://docs.microsoft.com/en-us/dotnet/api/system.range?vie...

But pretty much all the other new C# language features I've tried have just worked straight out of the box with .NET 4.7.2.

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