How to test whether a value is boxed in C# / .NET?

Question

I\'m looking for a way to write code that tests whether a value is boxed.

My preliminary investigations indicate that .NET goes out of its way to conceal the fact,

Answer 1

This approach is similar to Jared Par's answer. But I think !typeof(T).IsValueTypeis cleaner than enumerating all types which could contain a boxed value.

public static bool IsBoxed(T value)
{
    return !typeof(T).IsValueType && (value != null) && value.GetType().IsValueType;
}

Unlike Jared's code this will handle the case where T is System.ValueType correctly.

Another subtle point is that value.GetType().IsValueType comes after !typeof(T).IsValueType since otherwise GetType() would create a temporary boxed copy of the value.