named parameter type constraints

Question

I am designing a custom attribute class.

public class MyAttr: Attribute
{
    public ValueRange ValRange { get; set; }
}

Then I am attempti

Answer 1

Attribute parameter values need to be resolvable at compile time (i.e constants).

See Attribute Parameter Types on MSDN:

Values passed to attributes must be known to the compiler at compile time.

If you can create a ValueRange that is a constant, you can use it.