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为C#自定义控件添加自定义事件
大气象 原文 为C#自定义控件添加自定义事件
这两个按钮的共用单击事件处理代码如下:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Linq; using System.Text; using System.Windows.Forms; namespace UcDll { public partial class UcTest : UserControl { public UcTest() { InitializeComponent(); } //定义委托 public delegate void BtnClickHandle(object sender, EventArgs e); //定义事件 public event BtnClickHandle UserControlBtnClicked; private void btn_Click(object sender, EventArgs e) { if (UserControlBtnClicked != null) UserControlBtnClicked(sender, new EventArgs());//把按钮自身作为参数传递 } } }
在事件里可以找到UserControlBtnClicked事件。
private void ucTest1_UserControlBtnClicked(object sender, EventArgs e) { Button btn = sender as Button; MessageBox.Show(btn.Tag.ToString()); }
这个操作很有用。
url:http://greatverve.cnblogs.com/archive/2012/02/15/csharp-usercontrol-event.html
c# 自定义控件如何在属性栏添加自定义事件?可以双击生成+=代码?
用户控件的实现比较简单,直接从System.Windows.Forms.UserControl继承。
public class UserControl1 : System.Windows.Forms.UserControl
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_TextChanged);
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 =http://www.mamicode.com/value;} }
在窗体中使用的时候像普通控件一样进行访问,
userControl11.CustomValue = "http://www.mamicode.com/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 System.ComponentModel; using System.Drawing; using System.Data; using System.Windows.Forms; namespace ZZ.WindowsApplication1 { public class UserControl1 : System.Windows.Forms.UserControl { private System.Windows.Forms.TextBox textBox1; private string customValue; private System.ComponentModel.Container components = null; public string CustomValue { get{return customValue;} set{customValue =http://www.mamicode.com/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); this.textBox1.Name = "textBox1"; this.textBox1.TabIndex = 0; this.textBox1.Text = "textBox1"; this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged); this.Controls.Add(this.textBox1); this.Name = "UserControl1"; this.Size = new System.Drawing.Size(150, 92); this.ResumeLayout(false); } #endregion private void textBox1_TextChanged(object sender, System.EventArgs e) { if(UserControlValueChanged != null) UserControlValueChanged(this,new TextChangeEventArgs(this.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 System.ComponentModel; using System.Windows.Forms; using System.Data; namespace ZZ.WindowsApplication1 { public class Form1 : System.Windows.Forms.Form { private WindowsApplication1.UserControl1 userControl11; private System.ComponentModel.Container components = null; public Form1() { InitializeComponent(); userControl11.CustomValue = "用户控件自定义数据"; userControl11.UserControlValueChanged += newTextBoxChangedHandle(userControl11_UserControlValueChanged); } 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() { this.userControl11 = new WindowsApplication1.UserControl1(); this.SuspendLayout(); this.userControl11.Location = new System.Drawing.Point(8, 8); this.userControl11.Name = "userControl11"; this.userControl11.Size = new System.Drawing.Size(150, 84); this.userControl11.TabIndex = 0; this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(292, 193); this.Controls.Add(this.userControl11); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion [STAThread] static void Main() { Application.Run(new Form1()); } private void userControl11_UserControlValueChanged(object 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"; uc.UserControlValueChanged += new TextBoxChangedHandle(userControl11_UserControlValueChanged); this.Controls.Add(uc); }
另外从VS.net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。
//如果我有一个写好的控件,想在Form中使用如何???????
在控件中:
public delegate void OnSubBureauSelectChanged();//定义委托
public event OnSubBureauSelectChanged onSubBureauSelectChanged;//定义事件
//以下代码放在你要用在窗体中调用的事件中,可以是控件中有的也可以自己写的
if ( ( subBureaus.Count > 0 ) && ( onSubBureauSelectChanged != null ) )
onSubBureauSelectChanged ();
//以下写在窗体构造中
searchPanel.onSubBureauSelectChanged += new SearchPanel.OnSubBureauSelectChanged ( OnSubBureauSelectChanged );
//以下再写一个自己写的事件
private void OnSubBureauSelectChanged ( )
{这样就可以了}
为C#自定义控件添加自定义事件