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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Win
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		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
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(74, 212);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(120, 26);
            this.button1.TabIndex = 0;
            this.button1.Text = "关闭程序";
            this.button1.Click  = new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.BackColor = System.Drawing.Color.Silver;
            this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
            this.ClientSize = new System.Drawing.Size(354, 258);
            this.Controls.Add(this.button1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "演示创建不规则窗体";
            this.TransparencyKey = System.Drawing.Color.Silver;
            this.MouseUp  = new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
            this.MouseMove  = new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
            this.MouseDown  = new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
            this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//关闭应用程序
			this.Close();
		}
		private Point MousePos;        //记录鼠标指针的坐标
		private bool bMouseDown = false; //记录鼠标按键是否按下

		private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{//响应鼠标按下
			if (e.Button == MouseButtons.Left) 
			{
				MousePos.X = -e.X - SystemInformation.FrameBorderSize.Width;
				MousePos.Y = -e.Y - SystemInformation.CaptionHeight -SystemInformation.FrameBorderSize.Height;				
				bMouseDown = true;
			}
		}

		private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
		{//响应鼠标移动
			if (bMouseDown) 
			{
				Point CurrentPos = Control.MousePosition;
				CurrentPos.Offset( MousePos.X,  MousePos.Y);
				Location = CurrentPos;

			}
		}

		private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{//响应鼠标弹起
			if (e.Button == MouseButtons.Left) 
			{
				bMouseDown = false;
			}
		}

 


    

	}
}