C#委托和字典的结合使用

目录

 

例1：

例2：

---

例1：

 class Program
    {      
        static void Main(string[] args)
        {
            Dictionary<char, Func<float, float, float>> myDictionary = new Dictionary<char, Func<float, float, float>>();
            myDictionary.Add('+', Add);
            myDictionary.Add('-', Substract);
            myDictionary.Add('*', Multiply);
            myDictionary.Add('/', Divide);

            Console.WriteLine(myDictionary['+'](9, 3));
            Console.WriteLine(myDictionary['-'](9, 3));
            Console.WriteLine(myDictionary['*'](9, 3));
            Console.WriteLine(myDictionary['/'](9, 3));

            Console.ReadKey();
        }
        public static float Add(float a,float b)
        {
            return a + b;
        }
        public static float Substract(float a,float b)
        {
            return a - b;
        }
        public static float Multiply(float a,float b)
        {
            return a * b;
        }
        public static float Divide(float a,float b)
        {
            return a / b;
        }

    }

例2：

 class Program
    {      
        static void Main(string[] args)
        {
            Dictionary<string, Action<string>> myDictionary = new Dictionary<string, Action<string>>();
            if(!myDictionary.ContainsKey ("姓名"))
            {
                myDictionary["姓名"] = null;
            }
            myDictionary["姓名"] += Test1;
            myDictionary["姓名"] += Test2;
            myDictionary["姓名"] += Test3;
            myDictionary["姓名"]("李疆");

            Console.ReadKey();
        }
        public static void Test1(string name)
        {
            Console.WriteLine("你好,"+name );
        }
        public static void Test2(string name)
        {
            Console.WriteLine("很高兴认识你,"+name );
        }
        public static void Test3(string name)
        {
            Console.WriteLine("拜拜,"+name );
        }
    }