C#泛型方法

 class Program {
        public static string GetSum(T a, T b)
        {
            return a + "" + b;
        } 
        static void Main(string[] args) {
            Console.WriteLine(GetSum(12,34));
            Console.WriteLine(GetSum(12.3,34.5));
            Console.WriteLine(GetSum("23r,","wer3l2kj"));
            Console.ReadKey();
        }
    }