C#委托和字典的结合使用

àì夳堔傛蜴生んèń 2021-09-17 12:26 288阅读 0赞

**目录**

例1：

例2：

--------------------

# 例1： #

namespace ConsoleApp9
    {
        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);
    
                myDictionary['+'](9, 3);
                myDictionary['-'](9, 3);
                myDictionary['*'](9, 3);
                myDictionary['/'](9, 3);
    
                Console.ReadKey();
            }
            public static float Add(float a, float b)
            {
                float result = a + b;
                Console.WriteLine(a + "+" + b + "的值为：" + result);
                return result ;
            }
            public static float Substract(float a, float b)
            {
                float result = a - b;
                Console.WriteLine(a + "-" + b + "的值为：" + result);
                return result;
            }
            public static float Multiply(float a, float b)
            {
                float result = a * b;
                Console.WriteLine(a + "*" + b + "的值为：" + result);
                return result;
            }
            public static float Divide(float a, float b)
            {
                float result = a / b;
                Console.WriteLine(a + "/" + b + "的值为：" + result);
                return result;
            }
        }
    }

![20190116134309387.png][]

# 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 );
            }
        }

![20190105154623981.png][]

[20190116134309387.png]: /images/20210725/7b8cacd532bc424f9c89c0bfe9c5be61.png
[20190105154623981.png]: /images/20210725/bd62c54e14104300aa4c69d94beb8c1f.png