c# 自定义控件如何在属性栏添加自定义事件

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 =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 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 =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 += new TextBoxChangedHandle(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}

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