Csharp/CSharp Tutorial/Reflection/Generic Type

Reflection with Generics

using System;
using System.Reflection;
public class Program
{
  static void Main()
  {
      Type type;
      type = typeof(System.Nullable<>);
      Console.WriteLine(type.ContainsGenericParameters);
      Console.WriteLine(type.IsGenericType);
      type = typeof(System.Nullable<DateTime>);
      Console.WriteLine(!type.ContainsGenericParameters);
      Console.WriteLine(type.IsGenericType);
  }
}

Type: MakeGenericType

using System;
using System.Collections.Generic;
public class MainClass
{
    static void Main() {
        IList<int> intList = (IList<int>) CreateClosedType<int>( typeof(List<>) );
        IList<double> doubleList = (IList<double>) CreateClosedType<double>( typeof(List<>) );
        Console.WriteLine( intList );
        Console.WriteLine( doubleList );
    }
    static object CreateClosedType<T>( Type genericType ) {
        Type[] typeArguments = {
            typeof( T )
        };
        Type closedType = genericType.MakeGenericType( typeArguments );
        return Activator.CreateInstance( closedType );
    }
}

System.Collections.Generic.List`1[System.Int32]
System.Collections.Generic.List`1[System.Double]

Using Reflection with Generic Types

using System;
using System.Collections.Generic;
public class Program
{
  public static void Main()
  {
      Stack<int> s = new Stack<int>();
      Type t = s.GetType();
      foreach(Type types in t.GetGenericArguments())
      {
          System.Console.WriteLine(
              "Type parameter: " + types.FullName);
      }
      // ...
  }
}