| 下面的代码是一个网上常见的例程,大家可以拷贝下来，保存为.cs文件，用CSC编译就行 代码如下: using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace Events_Interfaces { public delegate void dele();//声明代表 delegate 关键字通知编译器 dele 是一个委托类型 public interface IEvents //定义接口IEvents，包含方法FireEvent事件event1 { event dele event1; void FireEvent(); } public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.Label label1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Button button1; private System.Windows.Forms.Label label3; private System.ComponentModel.Container components =null; public Form1() { InitializeComponent(); } protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code private void InitializeComponent() { this.textBox1 = new System.Windows.Forms.TextBox(); this.label1 = new System.Windows.Forms.Label(); this.button1 = new System.Windows.Forms.Button(); this.label2 = new System.Windows.Forms.Label(); this.label3 = new System.Windows.Forms.Label(); this.SuspendLayout(); this.textBox1.Location = new System.Drawing.Point(8, 80); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(56,23); this.textBox1.TabIndex = 1; this.textBox1.Text = ""; this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Key_Press); this.label1.Location = new System.Drawing.Point(16, 16); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(256,64); this.label1.TabIndex = 0; this.label1.Text = "Whenever you use the arrow keys inside the text box, Corresponding events will be" +"fired to display the label appropriately. Have a try!!"; this.button1.Location = new System.Drawing.Point(240, 112); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(48,23); this.button1.TabIndex = 3; this.button1.Text = "Exit"; this.button1.Click += new System.EventHandler(this.button1_Click); // // label2 // this.label2.Location = new System.Drawing.Point(88, 80); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(184,23); this.label2.TabIndex = 2; this.label2.TextAlign =System.Drawing.ContentAlignment.MiddleCenter; // // label3 // this.label3.Location = new System.Drawing.Point(8, 104); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(64,23); this.label3.TabIndex = 4; this.label3.TextAlign =System.Drawing.ContentAlignment.MiddleCenter; // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 16); this.ClientSize = new System.Drawing.Size(292,141); this.Controls.AddRange(new System.Windows.Forms.Control[]{this.label3,this.button1,this.label2,this.textBox1,this.label1}); this.Font= new System.Drawing.Font("ComicSansMS",8.25F,System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point,((System.Byte)(0))); this.Name = "Form1"; this.Text = "Events"; this.ResumeLayout(false); } #endregion static void Main() { Application.Run(new Form1()); } private void Key_Press(object sender, System.Windows.Forms.KeyEventArgs e) { textBox1.Text = ""; label2.Text = ""; string keyId = e.KeyCode.ToString(); switch (keyId)//判断是否按下方向键 { case "Right": label3.Text = ""; IEvents id1 = new EventClass1(); //实例化一个接口 id1.event1 += new dele(EventFired1);//定义EventClass1中的事件响应方法 id1.FireEvent();//调用EventClass1中的FireEvent方法，触发event1 事件，事件调用EventFired1方法 break; case "Left": label3.Text = ""; IEvents id2 = new EventClass2(); id2.event1 += new dele(EventFired2); id2.FireEvent(); break; case "Down": label3.Text = ""; IEvents id3 = new EventClass3(); id3.event1 += new dele(EventFired3); id3.FireEvent(); break; case "Up": label3.Text = ""; IEvents id4 = new EventClass4(); id4.event1 += new dele(EventFired4); id4.FireEvent(); break; default: label3.Text = keyId; break; } } //EventFired1方法 public void EventFired1() { label2.Text = ""; label2.Text = "You pressed RIGHT arrow key"; } public void EventFired2() { label2.Text = ""; label2.Text = "You pressed LEFT arrow key"; } public void EventFired3() { label2.Text = ""; label2.Text = "You pressed DOWN arrow key"; } public void EventFired4() { label2.Text = ""; label2.Text = "You pressed UP arrow key"; } private void button1_Click(object sender, System.EventArgs e) { Application.Exit(); } } public class EventClass1 : IEvents { public event dele event1; public void FireEvent() { event1(); } } public class EventClass2 : IEvents { public event dele event1; public void FireEvent() { event1(); } } public class EventClass3 : IEvents { public event dele event1; public void FireEvent() { event1(); } } public class EventClass4 : IEvents//EventClass1继承接口IEvents { public event dele event1;//定义事件成员event1 //当事件发生时 public void FireEvent() { event1();//调用事件处理 } } } |
正在阅读：Visual C#事件与接口编程实例Visual C#事件与接口编程实例
2004-02-14 09:34
出处：PConline
责任编辑：ycx
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