为C#自定义控件添加自定义事件

为C#自定义控件添加自定义事件展开全文用户控件的实现比较简单，直接从erControl继承。

public class UserControl1 : erControl为了便于测试我在上面添加了一个TextBox,并注册TextBox的TextChanged事件，this.textBox1.TextChanged += new System.EventHandler(this.textBox1_T extChanged);事件处理函数，private void textBox1_TextChanged(object sender, System.EventArgs e){MessageBox.Show(this.textBox1.Text);}这里演示如果控件中文本框的内容改变就会用MessageBox显示当前的文本框内容。

窗体中添加上面的用户控件，当我们改变textBox的文本时，可以看到跳出一个对话框，很简单吧。

下面来看看对控件添加属性。

这里定义一个私有变量。

private string customValue;添加访问他的属性public string CustomValue{get{return customValue;}set{customValue =value;}}在窗体中使用的时候像普通控件一样进行访问，userControl11.CustomValue = "用户控件自定义数据";通过事件可以传递消息到窗体上，在定义之前我们先来写一个简单的参数类。

public class TextChangeEventArgs : EventArgs{private string message;public TextChangeEventArgs(string message){this.message = message;}public string Message{get{return message;}}}定义委托为，public delegate void TextBoxChangedHandle(object sender, TextChangeEventArgs e);接下去在用户控件中添加事件，//定义事件public event TextBoxChangedHandle UserControlValueChanged;为了激发用户控件的新增事件，修改了一下代码，private void textBox1_TextChanged(object sender, System.EventArgs e){if(UserControlValueChanged != null)UserControlValueChanged(this,new TextChangeEventArgs(this.textBox1.Text));}好了，为了便于在Csdn上回答问题，把完整的代码贴了出来：using System;using System.Collections;using ponentModel;using System.Drawing;using System.Data;using System.Windows.Forms;namespace ZZ.WindowsApplication1{public class UserControl1 : erControl{private System.Windows.Forms.TextBox textBox1;private string customValue;private ponentModel.Containercomponents = null;public string CustomValue{get{return customValue;}set{customValue =value;}}//定义事件public event TextBoxChangedHandle UserControlValueChanged;public UserControl1(){InitializeComponent();}protected override void Dispose( bool disposing ){if( disposing ){if(components != null){components.Dispose();}}base.Dispose( disposing );}#region组件设计器生成的代码private void InitializeComponent(){this.textBox1 = new System.Windows.Forms.TextBox();this.SuspendLayout();this.textBox1.Location = new System.Drawing.Point(12, 36); = "textBox1";this.textBox1.TabIndex = 0;this.textBox1.Text = "textBox1";this.textBox1.TextChanged+= new System.EventHandler(this.textBox1_TextChanged);this.Controls.Add(this.textBox1); = "UserControl1";this.Size = new System.Drawing.Size(150, 92);this.ResumeLayout(false);}#endregionprivate void textBox1_TextChanged(object sender, System.EventArgs e){if(UserControlValueChanged != null)UserControlValueChanged(this,new TextChangeEventArgs(t his.textBox1.Text));}}//定义委托public delegate void TextBoxChangedHandle(object sender, TextChangeEventArgs e);public class TextChangeEventArgs : EventArgs{private string message;public TextChangeEventArgs(string message){this.message = message;}public string Message{get{return message;}}}}使用时要在窗体中注册上面的事件，比较简单都贴源代码了，using System;using System.Drawing;using System.Collections;using ponentModel;using System.Windows.Forms;using System.Data;namespace ZZ.WindowsApplication1{public class Form1 : System.Windows.Forms.Form{private erControl1 userControl11;private ponentModel.Container components = null;public Form1(){InitializeComponent();userControl11.CustomValue = "用户控件自定义数据";erControlValueChanged+= new TextBoxChangedHandle(userControl11_UserControlValu eChanged);}protected override void Dispose( bool disposing ){if( disposing ){if (components != null){components.Dispose();}}base.Dispose( disposing );}#region Windows 窗体设计器生成的代码private void InitializeComponent(){erControl11= new erControl1();this.SuspendLayout();erControl11.Location = new System.Drawing.Point(8, 8); = "userControl11";erControl11.Size = new System.Drawing.Size(150, 84);erControl11.TabIndex = 0;this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);this.ClientSize = new System.Drawing.Size(292, 193);this.Controls.Add(erControl11); = "Form1";this.Text = "Form1";this.ResumeLayout(false);}#endregion[STAThread]static void Main(){Application.Run(new Form1());}private void userControl11_UserControlValueChanged(objec t sender, TextChangeEventArgs e){MessageBox.Show("当前控件的值为:" + e.Message);}}}另外需要动态加载，就把控件添加在容器的Controls集合就行了，下面是在构造函数中添加控件，public Form1(){InitializeComponent();UserControl1 uc = new UserControl1();uc.CustomValue = "动态加载的用户控件";erControlValueChanged+= new TextBoxChangedHandle(userControl11_UserControlValu eChanged);this.Controls.Add(uc);}另外从中的工具箱中拖动用户控件到窗体上，如果是第一次需要编译一下项目。