How do I convert a System.Type to its nullable version?

Question

Once again one of those: "Is there an easier built-in way of doing things instead of my helper method?"

So it's easy to get the underlying type from a nullable type, but how do I get the nullable version of a .NET type?

So I have

typeof(int) typeof(DateTime) System.Type t = something; 

and I want

int?  DateTime? 

or

Nullable<int> (which is the same) if (t is primitive) then Nullable<T> else just T 

Is there a built-in method?

Answer 1

Here is the code I use:

Type GetNullableType(Type type) {     // Use Nullable.GetUnderlyingType() to remove the Nullable<T> wrapper if type is already nullable.     type = Nullable.GetUnderlyingType(type) ?? type; // avoid type becoming null     if (type.IsValueType)         return typeof(Nullable<>).MakeGenericType(type);     else         return type; }