Question

I have a generic method behavior of which depends on T is reference type or value type. It looks so:

T SomeGenericMethod <T> (T obj)
{
  if (T is class) //What condition I must write in the brackets?
   //to do one stuff
  else //if T is a value type like struct, int, enum and etc.
   //to do another stuff
}

I can’t duplicate this method like:

T SomeGenericMethod <T> (T obj) where T : class
{
 //Do one stuff
}

T SomeGenericMethod <T> (T obj) where T : struct
{
 //Do another stuff
}

because their signatures are equal. Can anyone help me?

Answer 1

You can use the typeof operator with generic types, so typeof(T) will get the Type reference corresponding to T, and then use the IsValueType property:

if (typeof(T).IsValueType)

Or if you want to include nullable value types as if they were reference types:

// Only true if T is a reference type or nullable value type
if (default(T) == null)