[转载]Winform等待窗口的实现（附源代码）

在开发Winform程序的时候，经常会用到等待窗口（如网络通讯、数据库连接等需要一定时间来执行的操作），这样可以给用户提供更好的体验。

等待窗口的主要功能是一边执行需要等待的操作，一边显示一个等待界面。当执行完毕时等待界面消失。用户可以提前取消操作，还可以设置操作的最大等待时间，若超过指定时间仍没完成操作可结束当前操作。等待窗口的操作处理内容可用λ表达式，在后面的应用实例中可看到使用方法。

实现界面如下图：

 

等待界面主要包含的部分：

• 等待图片；
• 等待消息文字("正在处理数据，请稍后...")：可自定义；
• 计时器：可设置不显示；
• 取消返回按钮：可设置不显示；
• 另外等待窗口显示和关闭的时候都有渐变的一个简单特效，等待窗口的颜色是在一定范围内随即的。

等待窗口实现代码：

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;   namespace WinForm_Test {     public partial class frmWaitingBox : Form     {         #region Properties         private int _MaxWaitTime;         private int _WaitTime;         private bool _CancelEnable;         private IAsyncResult _AsyncResult;         private EventHandler<EventArgs> _Method;         private bool _IsShown = true;         private readonly int _EffectCount = 10;         private readonly int _EffectTime = 500;         /// <summary>         /// 控制界面显示的特性         /// </summary>         private Timer _Timer;         public string Message { get; private set; }         public int TimeSpan { get; set; }         public bool FormEffectEnable { get; set; }         #endregion           #region frmWaitingBox         public frmWaitingBox(EventHandler<EventArgs> method,int maxWaitTime,string waitMessage,bool cancelEnable,bool timerVisable)         {             maxWaitTime *= 1000;             Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);         }         public frmWaitingBox(EventHandler<EventArgs> method)         {             int maxWaitTime=60*1000;             string waitMessage = "正在处理数据，请稍后...";             bool cancelEnable=true;             bool timerVisable=true;             Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);         }         public frmWaitingBox(EventHandler<EventArgs> method, string waitMessage)         {             int maxWaitTime = 60 * 1000;             bool cancelEnable = true;             bool timerVisable = true;             Initialize(method, maxWaitTime, waitMessage, cancelEnable, timerVisable);         }         public frmWaitingBox(EventHandler<EventArgs> method, bool cancelEnable, bool timerVisable)         {             int maxWaitTime = 60*1000;             string waitMessage = "正在处理数据，请稍后...";             Initialize(method, maxWaitTime,waitMessage, cancelEnable, timerVisable);         }         #endregion           #region Initialize         private void Initialize(EventHandler<EventArgs> method, int maxWaitTime,string waitMessage,bool cancelEnable, bool timerVisable)         {             InitializeComponent();             //initialize form             this.FormBorderStyle = FormBorderStyle.None;             this.StartPosition = FormStartPosition.CenterParent;             this.ShowInTaskbar = false;             Color[] c = GetRandColor();             this.panel1.BackColor = c[0];             this.BackColor = c[1];             this.labMessage.Text = waitMessage;             _Timer = new Timer();             _Timer.Interval = _EffectTime/_EffectCount;             _Timer.Tick += _Timer_Tick;             this.Opacity = 0;             FormEffectEnable = true;             //para             TimeSpan = 500;             Message = string.Empty;             _CancelEnable = cancelEnable;             _MaxWaitTime = maxWaitTime;             _WaitTime = 0;             _Method = method;             this.pictureBoxCancel.Visible = _CancelEnable;             this.labTimer.Visible = timerVisable;             this.timer1.Interval = TimeSpan;             this.timer1.Start();         }         #endregion           #region Color         private Color[] GetRandColor()         {             int rMax = 248;             int rMin = 204;             int gMax = 250;             int gMin = 215;             int bMax = 250;             int bMin = 240;             Random r = new Random(DateTime.Now.Millisecond);             int r1 = r.Next(rMin, rMax);             int r2 = r1 + 5;             int g1 = r.Next(gMin, gMax);             int g2 = g1 + 5;             int b1 = r.Next(bMin, bMax);             int b2 = b1 + 5;             Color c1 = Color.FromArgb(r1, g1, b1);             Color c2 = Color.FromArgb(r2, g2, b2);             Color[] c = { c1, c2 };             return c;         }         #endregion           #region Events         private void btnCancel_Click(object sender, EventArgs e)         {             this.Message = "您结束了当前操作！";             this.Close();         }           private void timer1_Tick(object sender, EventArgs e)         {             _WaitTime += TimeSpan;             this.labTimer.Text = string.Format("{0}秒", _WaitTime / 1000);             if (!this._AsyncResult.IsCompleted)             {                 if (_WaitTime > _MaxWaitTime)                 {                     Message = string.Format("处理数据超时{0}秒，结束当前操作！", _MaxWaitTime / 1000);                     this.Close();                 }             }             else             {                 this.Message = string.Empty;                 this.Close();             }                       }           private void frmWaitingBox_Shown(object sender, EventArgs e)         {             _AsyncResult = _Method.BeginInvoke(null, null, null, null);             //Effect             if (FormEffectEnable)             {                 _Timer.Start();             }             else                 this.Opacity = 1;         }         private void frmWaitingBox_FormClosing(object sender, FormClosingEventArgs e)         {             if (FormEffectEnable)             {                 if(this.Opacity>=1)                     e.Cancel = true;                 _Timer.Start();             }         }         private void _Timer_Tick(object sender, EventArgs e)         {             if (_IsShown)             {                 if (this.Opacity >= 1)                 {                     _Timer.Stop();                     _IsShown = false;                 }                 this.Opacity += 1.00 / _EffectCount;             }             else             {                 if (this.Opacity <= 0)                 {                     _Timer.Stop();                     _IsShown = true;                     this.Close();                 }                 this.Opacity -= 1.00 / _EffectCount;             }         }         #endregion                 } }

应用实例代码：

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string res;  DataTable dt=null;  frmWaitingBox f = new frmWaitingBox((obj,args)=>      {          Thread.Sleep(5000);          string sql = "SELECT * FROM [test].[dbo].[studentInfo]";          SQLHelper sqlHelper=new SQLHelper();          dt = sqlHelper.ExecuteSqlStr(sql,out res);      });  f.ShowDialog(this);    dataGridView1.DataSource = dt;

源码下载：下载地址——（http://files.cnblogs.com/anding/WinForm_Test1.rar）

原文地址:http://www.cnblogs.com/anding/archive/2010/10/07/1845251.html