[paphillips]

Related to this, for anyone not fully up to date on recent C# features there is also the CallerArgumentExpression [1], [2] feature introduced in C# 10. While it is not a pretty printer for an expression, it does allow the full expression passed from the call site as an argument value to be captured and used within the method. This can be useful for custom assert extensions.

For example:

    public void CheckIsTrue(bool value, [CallerArgumentExpression("value")] string? expression = null)
    {
        if (!value) 
        { 
            Debug.WriteLine($"Failed: '{expression}'"); 
        }
    }

So if you call like this: CheckIsTrue(foo != bar && baz == true), when the value is false it prints "Failed: 'foo != bar && baz == true'".

[1] https://learn.microsoft.com/en-us/dotnet/csharp/language-ref... [2] https://learn.microsoft.com/en-us/dotnet/csharp/language-ref...