C# 模板方法 T

 class Program
    {
        static void Main(string[] args)
        {
            int a = 1;
            int b = 2;

            char c = 'a';
            char d = 'b';

            swap<int>(ref a, ref b);
            Console.WriteLine( "{0} {1}", a, b );

            swap<char>(ref c, ref d);
            Console.WriteLine("{0} {1}", c, d);

            Console.ReadLine();
        }

        // 交换位置
        static void swap(ref T a, ref T b) {
            T temp;
            temp = a;
            a = b;
            b = temp;
        }
    }

注意‘ref’相当于C++的指针变量，引用传递