用戶控件的實現比較簡單，直接從System.Windows.Forms.UserControl繼承。
public class UserControl1 : System.Windows.Forms.UserControl
爲了便於測試我在上面添加了一個TextBox,並註冊TextBox的TextChanged事件，
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
事件處理函數，
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
MessageBox.Show(this.textBox1.Text);
}
這裏演示如果控件中文本框的內容改變就會用MessageBox顯示當前的文本框內容。
窗體中添加上面的用戶控件，當我們改變textBox的文本時，可以看到跳出一個對話框，很簡單吧。
下面來看看對控件添加屬性。
這裏定義一個私有變量。
private string customValue;
添加訪問他的屬性
public string CustomValue
{
get{return customValue;}
set{customValue =value;}
}
在窗體中使用的時候像普通控件一樣進行訪問，
userControl11.CustomValue = "用戶控件自定義數據";
通過事件可以傳遞消息到窗體上，在定義之前我們先來寫一個簡單的參數類。
public class TextChangeEventArgs : EventArgs
{
private string message;
public TextChangeEventArgs(string message)
{
this.message = message;
}
public string Message
{
get{return message;}
}
}
定義委託爲，
public delegate void TextBoxChangedHandle(object sender,TextChangeEventArgs e);
接下去在用戶控件中添加事件，
//定義事件
public event TextBoxChangedHandle UserControlValueChanged;
爲了激發用戶控件的新增事件，修改了一下代碼，
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
if(UserControlValueChanged != null)
UserControlValueChanged(this,new TextChangeEventArgs(this.textBox1.Text));
}
好了，爲了便於在Csdn上回答問題，把完整的代碼貼了出來：
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;}
}
//定義事件
public event TextBoxChangedHandle UserControlValueChanged;
public UserControl1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region組件設計器生成的代碼
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));
}
}
//定義委託
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;}
}
}
}
使用時要在窗體中註冊上面的事件，比較簡單都貼源代碼了，
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 = "用戶控件自定義數據";
userControl11.UserControlValueChanged += new TextBoxChangedHandle(userControl11_UserControlValueChanged);
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗體設計器生成的代碼
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("當前控件的值爲:" + e.Message);
}
}
}
另外需要動態加載，就把控件添加在容器的Controls集合就行了，下面是在構造函數中添加控件，
public Form1()
{
InitializeComponent();
UserControl1 uc = new UserControl1();
uc.CustomValue = "動態加載的用戶控件";
uc.UserControlValueChanged += new TextBoxChangedHandle(userControl11_UserControlValueChanged);
this.Controls.Add(uc);
}
另外從VS.net中的工具箱中拖動用戶控件到窗體上，如果是第一次需要編譯一下項目。
//如果我有一個寫好的控件，想在Form中使用如何？？？？？？？
在控件中：
public delegate void OnSubBureauSelectChanged();//定義委託
public event OnSubBureauSelectChanged onSubBureauSelectChanged;//定義事件
public delegate void OnSubBureauSelectChanged();//定義委託
public event OnSubBureauSelectChanged onSubBureauSelectChanged;//定義事件
//以下代碼放在你要用在窗體中調用的事件中，可以是控件中有的也可以自己寫的
if ( ( subBureaus.Count > 0 ) && ( onSubBureauSelectChanged != null ) )
onSubBureauSelectChanged ();
onSubBureauSelectChanged ();
//以下寫在窗體構造中
searchPanel.onSubBureauSelectChanged += new SearchPanel.OnSubBureauSelectChanged ( OnSubBureauSelectChanged );
//以下再寫一個自己寫的事件
private void OnSubBureauSelectChanged ( )
{這樣就可以了}
{這樣就可以了}
