How to fix this?

Question

Hello everyone,

• I have added a CodeFile page to the ControlLibrary project in my NewTims project. I used the code provided in the accepted answer on the webpage https://stackoverflow.com/questions/3586975/what-is-iif-in-c. However, the code is showing up as red-lined. The error is

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CS8370 Feature 'static local functions' is not available in C# 7.3. Please use language version 8.0 or greater.

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    Can someone please guide me on how to fix this issue?

• I believe my Visual Studio can run C# 8.0 or 9.0. I'd like to know how to force my system to use C# 8.0 or 9.0.

Answer 1

Try the following.

public static class Extensions
{
    public static T IIf<T>(this bool expression, T truePart, T falsePart) 
        => expression ? truePart : falsePart;
}