How to determine whether T is a value type or reference class in generic?

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) 

Answer 2

[The following answer does not check the static type of T but the dynamic type of obj. This is not exactly what you asked for, but since it might be useful for your problem anyway, I'll keep this answer for reference.]

All value types (and only those) derive from System.ValueType. Thus, the following condition can be used:

if (obj is ValueType) {     ... } else {     ... }