using System;

​

public class A<T>

{

    public static Test<T> t = new Test<T>();

    public static int i = 10;

​

    public void Write()

    {

        Console.WriteLine(typeof(T));

    }

}

​

public class Test<T>

{

    public Test()

    {

        Console.WriteLine("Built a Test instance : " + typeof(T));

    }

}

​

public class Program

{

    private static void InvokeWrite<T>()

    {

        Type genericType = typeof(A<>).MakeGenericType(new Type[]{typeof(T)});

        object o = Activator.CreateInstance(genericType);

        genericType.GetMethod(nameof(A<object>.Write)).Invoke(o, null);

    }

    private static void Set<T>(int i)

    {

        Type genericType = typeof(A<>).MakeGenericType(new Type[]{typeof(T)});

        object o = Activator.CreateInstance(genericType);

        genericType.GetField(nameof(A<object>.i)).SetValue(o, i);

    }

    private static void Get<T>()

    {

        Type genericType = typeof(A<>).MakeGenericType(new Type[]{typeof(T)});

        object o = Activator.CreateInstance(genericType);

        Console.WriteLine(genericType.GetField(nameof(A<object>.i)).GetValue(o).ToString());

    }

​

    public static void Main()

    {

​

        Set<int>(20);

        Set<string>(15);

        Get<string>();

        InvokeWrite<object>();

    }

}