Why doesn't C# allow a typeof as a default parameter?

Question

class MyClass
{
    public void MyMethod(Type targetType = typeof(MyClass))
    {
    }
}

Isn't typeof(MyClass) a compile-time constant?

Answer 1

From MSDN - Named and Optional Parameters:

A default value must be one of the following types of expressions:

• a constant expression;

• an expression of the form new ValType(), where ValType is a value type, such as an enum or a struct;

• an expression of the form default(ValType), where ValType is a value type.

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typeof does not necessarily return a compile time constant as it may return different results depending on context.