Action 和 Func 的用法以及区别

public static void test(string s)
        {
            Console.WriteLine("name1:{0}", s); 
        }
static void Main(string[] args)
        {
            Action<string> action_ = new Action<string>(test);
            action_ -= test;
            action_ += delegate(string s) { Console.WriteLine("name2:{0}", s); };
            action_("1");
}