Windows 窗体支持三种用户定义的控件：复合、扩展和自定义，复合控件是封装在公共容器内的 Windows 窗体控件的集合。这种控件有时称为“用户控件”，包含的控件称为“构成控件”。
控件代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace WindowsControlLibrary1
{
public partial class UserControl1 : UserControl
{
public delegate void TextBoxChangedHandle(string message);
public delegate void MyButtonClickHandle();
public event TextBoxChangedHandle TextBoxChanged;
public event MyButtonClickHandle MyButtonClick;
public UserControl1()
{
InitializeComponent();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
TextBoxChanged(this.textBox1.Text);
}
private void button1_Click(object sender, EventArgs e)
{
if (MyButtonClick != null)
{
MyButtonClick();
} }
}
}
调用窗体：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void userControl11_MyButtonClick()
{
MessageBox.Show("你点击用户控件中的按钮！" );
}
private void userControl11_TextBoxChanged(string message)
{
MessageBox.Show("你改变了用户控件中TextBox的值:" + message);
}
}
}