.net - How to use typeof or GetType() as Generic's Template?

Question

If it's harder to explain using words, let's look at an example I have a generic function like this

void FunctionA<T>() where T : Form, new()
{
}

If I have a reflected type, how do I use it with the above function? I'm looking forward to do this

Type a = Type.GetType("System.Windows.Forms.Form");
FunctionA<a>();

Of cause the above method doesn't work.

Answer 1

class Program
{
    static void Main(string[] args)
    {
        int s = 38;


        var t = typeof(Foo);
        var m = t.GetMethod("Bar");
        var g = m.MakeGenericMethod(s.GetType());
        var foo = new Foo();
        g.Invoke(foo, null);
        Console.ReadLine();
    }
}

public class Foo
{
    public void Bar<T>()
    {
        Console.WriteLine(typeof(T).ToString());
    }
}

it works dynamicaly and s can be of any type