C#事件 

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Diagnostics.Tracing;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Threading.Tasks;
 7 
 8 namespace JSONTest
 9 {
10     class Class2
11     {
12         static void Main()
13         {
14             Customer customer = new Customer();
15             Waiter waiter = new Waiter();
16             customer.Order += waiter.Action;
17             customer.Action();
18             customer.PayBill();
19         }
20     }
21     public class OrderEventArgs:EventArgs
22     {
23         public string DishName { get; set; }
24         public string Size { get; set; }
25 
26 
27     }
28     public delegate void OrderEventHandler(Customer customer, OrderEventArgs e);
29     public class Customer
30     {
31         private OrderEventHandler orderEventHandler;
32         public event OrderEventHandler Order
33         {
34             add
35             {
36                 this.orderEventHandler += value;
37             }
38             remove
39             {
40                 this.orderEventHandler -= value;
41             }
42         }
　　　　　　　　//以上为声明事件Order
43         public double Bill { get; set; }
44         public void PayBill()
45         {
46             Console.WriteLine("Pay{0}",this.Bill);
47         }
48         public void WalkIn()
49         {
50             Console.WriteLine("Walk into the restaurant");
51         }
52         public void SitDown()
53         {
54             Console.WriteLine("SitDown");
55         }
56         public void Think()
57         {
58             Console.WriteLine("Thinking");
59             if(this.orderEventHandler!=null)
60             {
61                 OrderEventArgs e = new OrderEventArgs();
62                 e.DishName = "鸡丁";
63                 e.Size = "Big";
64                 this.orderEventHandler.Invoke(this, e);
65             }
66         }
67         public void Action()
68         {
69             Console.ReadLine();
70             WalkIn();
71             SitDown();
72             Think();
73         }
74     }
75     class Waiter
76     {
77         public void Action(Customer customer, OrderEventArgs e)
78         {
79             Console.WriteLine("上菜{0}", e.DishName);
80             double price = 10;
81             switch(e.Size)
82             {
83                 case "small":
84                     price *= 0.5;
85                     break;
86                 case "Big":
87                     price *= 1.5;
88                     break;
89                 default:
90                     break;
91             }
92             customer.Bill += price;
93         }
94     }
95 }

以上是创建自定义事件的完整格式

 

 

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Diagnostics.Tracing;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Threading.Tasks;
 7 
 8 namespace JSONTest
 9 {
10     class Class2
11     {
12         static void Main()
13         {
14             Customer customer = new Customer();
15             Waiter waiter = new Waiter();
16             customer.Order += waiter.Action;
17             customer.Action();
18             customer.PayBill();
19         }
20     }
21     public class OrderEventArgs:EventArgs
22     {
23         public string DishName { get; set; }
24         public string Size { get; set; }
25 
26 
27     }
28     public delegate void OrderEventHandler(Customer customer, OrderEventArgs e);
29     public class Customer
30     {
31         public event OrderEventHandler Order;
32         public double Bill { get; set; }
33         public void PayBill()
34         {
35             Console.WriteLine("Pay{0}",this.Bill);
36         }
37         public void WalkIn()
38         {
39             Console.WriteLine("Walk into the restaurant");
40         }
41         public void SitDown()
42         {
43             Console.WriteLine("SitDown");
44         }
45         public void Think()
46         {
47             Console.WriteLine("Thinking");
48             if(this.Order!=null)
49             {
50                 OrderEventArgs e = new OrderEventArgs();
51                 e.DishName = "鸡丁";
52                 e.Size = "Big";
53                 this.Order.Invoke(this, e);
54             }
55         }
56         public void Action()
57         {
58             Console.ReadLine();
59             WalkIn();
60             SitDown();
61             Think();
62         }
63     }
64     class Waiter
65     {
66         public void Action(Customer customer, OrderEventArgs e)
67         {
68             Console.WriteLine("上菜{0}", e.DishName);
69             double price = 10;
70             switch(e.Size)
71             {
72                 case "small":
73                     price *= 0.5;
74                     break;
75                 case "Big":
76                     price *= 1.5;
77                     break;
78                 default:
79                     break;
80             }
81             customer.Bill += price;
82         }
83     }
84 }

以上为简略声明事件

 

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Diagnostics.Tracing;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Threading.Tasks;
 7 
 8 namespace JSONTest
 9 {
10     class Class2
11     {
12         static void Main()
13         {
14             Customer customer = new Customer();
15             Waiter waiter = new Waiter();
16             customer.Order += waiter.Action;
17             customer.Action();
18             customer.PayBill();
19         }
20     }
21     public class OrderEventArgs:EventArgs
22     {
23         public string DishName { get; set; }
24         public string Size { get; set; }
25 
26 
27     }
28     //public delegate void OrderEventHandler(Customer customer, OrderEventArgs e);
29     public class Customer
30     {
31         public event EventHandler Order; //用系统自带的EventHandler声明事件
32         public double Bill { get; set; }
33         public void PayBill()
34         {
35             Console.WriteLine("Pay{0}",this.Bill);
36         }
37         public void WalkIn()
38         {
39             Console.WriteLine("Walk into the restaurant");
40         }
41         public void SitDown()
42         {
43             Console.WriteLine("SitDown");
44         }
45         public void Think()
46         {
47             Console.WriteLine("Thinking");
48             if(this.Order!=null)
49             {
50                 OrderEventArgs e = new OrderEventArgs();
51                 e.DishName = "鸡丁";
52                 e.Size = "Big";
53                 this.Order.Invoke(this, e);
54             }
55         }
56         public void Action()
57         {
58             Console.ReadLine();
59             WalkIn();
60             SitDown();
61             Think();
62         }
63     }
64     class Waiter
65     {
66         public void Action(object sender, EventArgs e) //事件处理器也要符合格式
67         {
68             Customer customer = sender as Customer; //转换
69             OrderEventArgs orderInfo = e as OrderEventArgs; 
70             Console.WriteLine("上菜{0}", orderInfo.DishName);
71             double price = 10;
72             switch (orderInfo.Size)
73             {
74                 case "small":
75                     price *= 0.5;
76                     break;
77                 case "Big":
78                     price *= 1.5;
79                     break;
80                 default:
81                     break;
82             }
83             customer.Bill += price;
84         }
85     }
86 }

以上为不自己声明委托类型，而用系统自带的EventHandler

 

posted @ 2020-10-22 13:21  荼离伤花  阅读(3)  评论(0)  编辑  收藏  举报