Generic Types

The MakeGenericType method converts an unbound into a closed generic type.

 
using System;
using System.Reflection;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Type unbound = typeof(List<>);
        Type closed = unbound.MakeGenericType(typeof(int));
        Type unbound2 = closed.GetGenericTypeDefinition();  // unbound == unbound2

    }
}

IsGenericType property is true if a Type is generic

The following tests whether a type is a nullable value type:

 
using System;
using System.Reflection;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Type nullable = typeof(bool?); 
        Console.WriteLine(nullable.IsGenericType && nullable.GetGenericTypeDefinition() == typeof(Nullable<>));
    }
}

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