Why does Type.IsByRef for type String return false if String is a reference type?

Question

According to this a string (or String) is a reference type.

Yet given:

Type t = typeof(string);

then

if (t.IsBy         


        

Answer 1

You should use IsValueType instead:

bool f = !typeof (string).IsValueType; //return true;

As for IsByRef, the purpose of this property is to determine whether the parameter is passed into method by ref or by value.

Example you have a method which a is passed by ref:

public static void Foo(ref int a)
{
}

You can determine whether a is pass by reference or not:

  bool f = typeof (Program).GetMethod("Foo")
                                 .GetParameters()
                                 .First()
                                 .ParameterType
                                 .IsByRef;   //return true