gistfile1.txt

using System;
namespace test {

   static class Test<T> {
     static Test(){ 
        System.Console.WriteLine("Cons: {0}", typeof(T).Name);
     }
  
     public static void Do(T t) {
        System.Console.WriteLine("Do 1 {0}", t.GetType().Name);    
     }
   }


   class Program {

       static void Do<T>(T t) {
          System.Console.WriteLine("Do 2 {0}", t.GetType().Name);    
          Test<T>.Do(t);
       }

       static void Caller(object obj){
            dynamic tmp = obj;
            Do(tmp);
       }

       static void Main(string[] args) {
           Caller("1");
           Caller(2);
           Caller(3.0);
       }
   }
}

Do 2 String
Cons: String
Do 1 String
Do 2 Int32
Cons: Int32
Do 1 Int32
Do 2 Double
Cons: Double
Do 1 Double