Question

To check if a value type is nullable I’m currently doing something like this:

int? i = null;
bool isNullable = i.GetType().ToString().Contains("System.Nullable");

Is there a more elegant way to do this?

Answer 1

You can use Nullable.GetUnderlyingType(Type) – that will return null if it’s not a nullable type to start with, or the underlying value type otherwise:

if (Nullable.GetUnderlyingType(t) != null)
{
    // Yup, t is a nullable value type
}

Note that this uses the Nullable static class, rather than the Nullable<T> structure.