C# winform 使用进度条(两种形式)

C# winform 使用进度条(两种形式)

2009年02月07日 星期六 15:11

在用c#做WinFrom开发的过程中。我们经常需要用到进度条（ProgressBar）用于显示进度信息。这时候我们可能就需要用到多线程，如果不采用多线程控制进度条，窗口很容易假死（无法适时看到进度信息）。下面我就简单结合一个我写的例子给大家做一个介绍。 第一步：设计界面不说了...注意需要引用 using System.Threading; 第二步：定义一个代理，用于更新ProgressBar的值（Value）         //更新进度列表         private delegate void SetPos(int ipos); 第三步：进度条值更新函数（参数必须跟声明的代理参数一样）         private void SetTextMessage(int ipos)          {             if (this.InvokeRequired)              {                  SetPos setpos = new SetPos(SetTextMessage);                 this.Invoke(setpos, new object[] { ipos});              }             else              {                 this.label1.Text = ipos.ToString() + "/100";                 this.progressBar1.Value = Convert.ToInt32(ipos);              }          } 第四步：函数实现         private void button1_Click(object sender, EventArgs e)          {              Thread fThread = new Thread(new ThreadStart(SleepT));//开辟一个新的线程              fThread.Start();          } 第五步：新的线程执行函数：         private void SleepT()          {             for (int i = 0; i < 500; i++)              {                  System.Threading.Thread.Sleep(100);//没什么意思，单纯的执行延时                  SetTextMessage(100 * i / 500);              }          }   ============================= 使用浮动进度条 1.浮动窗口    ///         /// Increase process bar         ///         /// the value increased         ///         public bool Increase(int nValue)         {             if (nValue > 0)             {                 if (prcBar.Value + nValue < prcBar.Maximum)                 {                     prcBar.Value += nValue;                     return true;                 }                 else                 {                     prcBar.Value = prcBar.Maximum;                     this.Close();                     return false;                 }             }             return false;         }   2.使用进度的窗口 using System.Threading;      private frmProcessBar myProcessBar = null;         private delegate bool IncreaseHandle(int nValue);         private IncreaseHandle myIncrease = null;        private void ShowProcessBar()         {             myProcessBar = new frmProcessBar();             // Init increase event             myIncrease = new IncreaseHandle(myProcessBar.Increase);             myProcessBar.StartPosition = FormStartPosition.CenterScreen;             myProcessBar.ShowDialog();             myProcessBar = null;         }         private void ThreadFun()         {             MethodInvoker mi = new MethodInvoker(ShowProcessBar);             this.BeginInvoke(mi);             Thread.Sleep(1000);//Sleep a while to show window             bool blnIncreased = false;             object objReturn = null;             do             {                 Thread.Sleep(50);                 objReturn = this.Invoke(this.myIncrease, new object[] { 2 });                 blnIncreased = (bool)objReturn;             }             while (blnIncreased);         }   使用方法: Thread thdSub = new Thread(new ThreadStart(ThreadFun));     thdSub.Start();