一个自定义事件的处理程序
界面布置如上图，这个事例是依照《C#程序设计实用教程》（唐耀）写的，
每个铵钮的Tag属性分别设置成0，1，2，3，4，-1
代码如下。
新建两个类，一个是事件类，一个是Break类
代码如下：
//Break.cs
using System;
using System.Collections.Generic;
using System.Text;
namespace WinFormEvent
{
class Break
{
public delegate void BreakHandler(object sender , BreakArgs e);
public event BreakHandler changeBreak;
public void onChangeBreak(object sender, BreakArgs e)
{
if (changeBreak != null)
{
changeBreak(sender, e);
}
}
}
}
//BreakArgs.cs
using System;
using System.Collections.Generic;
using System.Text;
namespace WinFormEvent
{
class BreakArgs:EventArgs
{
private int i;
public int Level
{
get
{
return i;
}
set
{
i = value;
}
}
}
}
//form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WinFormEvent
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button1 .Click += new System.EventHandler(this.btnStart_Click);
button2.Click += new System.EventHandler(this.btnStart_Click);
button3.Click += new System.EventHandler(this.btnStart_Click);
button4.Click += new System.EventHandler(this.btnStart_Click);
btnBack . Click += new System.EventHandler(this.btnStart_Click);
}
private void btnStart_Click(object sender, EventArgs e)
{
Break b = new Break();
b.changeBreak += new WinFormEvent.Break.BreakHandler(b_changeBreak);
BreakArgs ee = new BreakArgs();
switch (Convert.ToInt32(((Button)sender).Tag))
{
case 0:
ee.Level = 0;
break;
case 1:
ee.Level = 1;
break;
case 2:
ee.Level = 2;
break;
case 3:
ee.Level = 3;
break;
case 4:
ee.Level = 4;
break;
case -1:
ee.Level = -1;
break;
}
b.onChangeBreak(sender, ee);
}
void b_changeBreak(object sender, BreakArgs e)
{
switch (e.Level)
{
case 0:
label1.Text = "启动";
break;
case 1:
label1.Text = "一档";
break;
case 2:
label1.Text = "二档";
break;
case 3:
label1.Text = "三档";
break;
case 4:
label1.Text = "四档";
break;
case -1:
label1.Text = "倒档";
break;
}
//throw new Exception("The method or operation is not implemented.");
}
}
}
//Form1.Designer.cs
namespace WinFormEvent
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.btnStart = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.button1 = new System.Windows.Forms.Button();
this.btnBack = new System.Windows.Forms.Button();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(45, 28);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(41, 12);
this.label1.TabIndex = 0;
this.label1.Text = "label1";
//
// groupBox1
//
this.groupBox1.Controls.Add(this.btnBack);
this.groupBox1.Controls.Add(this.button1);
this.groupBox1.Controls.Add(this.button4);
this.groupBox1.Controls.Add(this.button3);
this.groupBox1.Controls.Add(this.button2);
this.groupBox1.Controls.Add(this.btnStart);
this.groupBox1.Location = new System.Drawing.Point(31, 86);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(589, 94);
this.groupBox1.TabIndex = 1;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "档位摸拟";
//
// btnStart
//
this.btnStart.Location = new System.Drawing.Point(16, 39);
this.btnStart.Name = "btnStart";
this.btnStart.Size = new System.Drawing.Size(75, 23);
this.btnStart.TabIndex = 0;
this.btnStart.Tag = "0";
this.btnStart.Text = "启动";
this.btnStart.UseVisualStyleBackColor = true;
this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(203, 38);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 1;
this.button2.Tag = "2";
this.button2.Text = "2";
this.button2.UseVisualStyleBackColor = true;
//
// button3
//
this.button3.Location = new System.Drawing.Point(294, 38);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(75, 23);
this.button3.TabIndex = 2;
this.button3.Tag = "3";
this.button3.Text = "3";
this.button3.UseVisualStyleBackColor = true;
//
// button4
//
this.button4.Location = new System.Drawing.Point(386, 38);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(75, 23);
this.button4.TabIndex = 3;
this.button4.Tag = "4";
this.button4.Text = "4";
this.button4.UseVisualStyleBackColor = true;
//
// button1
//
this.button1.Location = new System.Drawing.Point(111, 38);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 4;
this.button1.Tag = "1";
this.button1.Text = "1";
this.button1.UseVisualStyleBackColor = true;
//
// btnBack
//
this.btnBack.Location = new System.Drawing.Point(481, 38);
this.btnBack.Name = "btnBack";
this.btnBack.Size = new System.Drawing.Size(75, 23);
this.btnBack.TabIndex = 5;
this.btnBack.Tag = "-1";
this.btnBack.Text = "倒档";
this.btnBack.UseVisualStyleBackColor = true;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(651, 195);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Label label1;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.Button btnBack;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button btnStart;
}
}
实现效果如下：
当你按下任一个铵钮时都会产生一个事件，通知Label显示相应的信息。
