动态添加控件

本程序实现在程序运行中向窗体添加Button控件，点击按钮就会在窗体上新增一个Button实例，程序界面如下。

添加鼠标滑过按钮改变按钮颜色的代码，点击按钮，TextBox中显示按钮信息，程序代码如下。

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
namespace eg42_addCtrlAtRuntimeApp
{
	public partial class MainForm : Form
	{
		private int count;
		public MainForm()
		{
			InitializeComponent();
		}
		
		void Btn_MouseEnter(object sender, EventArgs e)
		{
			Button currentButton=(Button)sender;
			currentButton.BackColor=Color.Blue;
		}
		
		void Btn_MouseLeave(object sender, EventArgs e)
		{
			Button currentButton=(Button)sender;
			currentButton.BackColor=System.Windows.Forms.Control.DefaultBackColor;
		}
		
		void Btn_Click(object sender, MouseEventArgs e)
		{
			Button currentButton=(Button) sender;
			txt_msg.Text="你点击了"+currentButton.Text;
		}
		
		void Btn_addButtonMouseClick(object sender, MouseEventArgs e)
		{
			count+=2;
			int localX=this.btn_addButton.Height*count;
			int localY=10*count;
			Button toAddButton=new Button();
			toAddButton.Name="Button"+count;
			toAddButton.Text="按钮"+count+"";
			toAddButton.Location=new Point(localX,localY);
			toAddButton.MouseEnter+=new EventHandler(this.Btn_MouseEnter);
			toAddButton.MouseLeave+=new EventHandler(this.Btn_MouseLeave);
			toAddButton.MouseClick+=new MouseEventHandler(this.Btn_Click);
			this.Controls.Add(toAddButton);
		}
	}
}