泛型委托Func

class Program
{
        double AddInt(int x, int y)
        {
            return x + y;
        }

        string AddString(string s1, string s2)
        {
            return s1 + s2;
        }

        static void Main(string[] args)
        {
            Program p = new Program();

            // 以为前两个参数为int,他们运行的结果为double,最后一个参数与AddInt返回值一致
            Func<int, int, double> funcInt = p.AddInt;
            Console.WriteLine("funcInt的值为{0}", funcInt(100, 300));

            Func<string, string, string> funcString = p.AddString;
            Console.WriteLine("funcString的值为{0}", funcString("aaa", "bbb"));
        }
}