C# winform 使用进度条(两种形式)

 

 

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, newobject[] { ipos});

             }

            else

             {

                this.label1.Text = ipos.ToString() + "/100";

                this.progressBar1.Value = Convert.ToInt32(ipos);

             }

         }

第四步：函数实现

        privatevoid 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：

        privatevoid 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

   /// <summary>
        /// Increase process bar
        /// </summary>
        /// <param name="nValue">the value increased</param>
        /// <returns></returns>
        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();