C# 關於委托的小例子。本站提示廣大學習愛好者:(C# 關於委托的小例子)文章只能為提供參考,不一定能成為您想要的結果。以下是C# 關於委托的小例子正文
本例子是一個關於委托的小例子[貓叫,狗跳,人喊]。
委托是C#開發中一個十分重要的概念,了解起來也和慣例的辦法不同,但一旦了解清楚,就可以信手拈來,隨處可用。
委托是對辦法的籠統。它存儲的就是一系列具有相反簽名和前往回類型的辦法的地址。調用委托的時分,委托包括的一切辦法將被執行。
觸及到的知識點:
委托的定義
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效果圖如下【點擊翻開貓,彈出CatForm,點擊喵喵按鈕,觸發事情,調用其他類的委托】:
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代碼如下:
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace DemoDelegate 7 { 8 public delegate void Handler();//定義一個委托類型 9 /// <summary> 10 /// 貓貓 11 /// </summary> 12 public class Cat 13 { 14 15 public Handler Miao; 16 17 /// <summary> 18 /// Miao叫的舉措 19 /// </summary> 20 public void MaioMiao() 21 { 22 var action = Miao; 23 if (action != null) 24 { 25 action(); 26 } 27 } 28 } 29 } 30 /////////////////////////////////////////////////// 31 using System; 32 using System.Collections.Generic; 33 using System.Linq; 34 using System.Text; 35 36 namespace DemoDelegate 37 { 38 /// <summary> 39 /// 心愛的狗狗 40 /// </summary> 41 public class Dog 42 { 43 public Handler Tiao; 44 45 /// <summary> 46 /// 狗跳的舉措 47 /// </summary> 48 public void DogTiao() 49 { 50 var action = Tiao; 51 if (action != null) 52 { 53 action(); 54 } 55 } 56 } 57 } 58 59 /////////////////////////////////////////////// 60 61 using System; 62 using System.Collections.Generic; 63 using System.Linq; 64 using System.Text; 65 66 namespace DemoDelegate 67 { 68 /// <summary> 69 /// 主人 70 /// </summary> 71 public class Master 72 { 73 public Handler Han; 74 75 public void HanJiao() 76 { 77 var action = Han; 78 if (action != null) 79 { 80 action(); 81 } 82 } 83 84 } 85 }View Code
界面類代碼如下:
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 10 namespace DemoDelegate 11 { 12 public partial class MainForm : Form 13 { 14 private Dog dog; 15 16 private Master master; 17 18 public MainForm() 19 { 20 InitializeComponent(); 21 InitInfo(); 22 } 23 24 /// <summary> 25 /// 初始化信息 26 /// </summary> 27 private void InitInfo() { 28 dog = new Dog(); 29 dog.Tiao += TiaoMethod; 30 master = new Master(); 31 master.Han += HanMethod; 32 } 33 34 /// <summary> 35 /// 喵喵 36 /// </summary> 37 /// <param name="sender"></param> 38 /// <param name="e"></param> 39 private void btnCatMiao_Click(object sender, EventArgs e) 40 { 41 CatForm catForm = new CatForm(); 42 catForm.MiaoAction += MaioMethod; 43 catForm.ShowDialog(); 44 } 45 46 private void MaioMethod(object sender,EventArgs e) { 47 this.txtCat.Text = "貓在父頁面叫了"; 48 this.dog.DogTiao(); 49 this.master.HanJiao(); 50 } 51 52 private void TiaoMethod() 53 { 54 this.txtDog.Text = "狗跳了"; 55 } 56 57 private void HanMethod() 58 { 59 this.txtMaster.Text = "別叫了"; 60 } 61 } 62 } 63 ///////////////////////////////////////////////////////////////// 64 using System; 65 using System.Collections.Generic; 66 using System.ComponentModel; 67 using System.Data; 68 using System.Drawing; 69 using System.Linq; 70 using System.Text; 71 using System.Windows.Forms; 72 73 namespace DemoDelegate 74 { 75 public partial class CatForm : Form 76 { 77 private Cat cat; 78 79 public event EventHandler MiaoAction; 80 81 public CatForm() 82 { 83 InitializeComponent(); 84 InitInfo(); 85 } 86 87 public void InitInfo() { 88 cat = new Cat(); 89 cat.Miao += MaioMethod; 90 } 91 92 private void MaioMethod() 93 { 94 this.txtCat.Text = "貓叫了"; 95 var action = MiaoAction; 96 if (action != null) { 97 action(cat, null); 98 } 99 } 100 101 private void btnCatMiao_Click(object sender, EventArgs e) 102 { 103 this.cat.MaioMiao(); 104 } 105 } 106 }View Code
關於委托,功用和用處還有很多,這裡只是拋磚引玉,希望能對大家有協助