C# .Net WinForm 进度条ProgressBar 用法 实例

 如何使用进度条：

一、添加控件

            Panel panelBack=new Panel();

           ProgressBar progressBarExcelExport=new ProgressBar();

            Label lblCaption=new Label();

二、    初始化设置

        panelBack.Visable=false;

        progressBarExcelExport.Visable=false;

      lblCaption.Visable=false;

三、在需要显示进度条的函数里添加

           Rectangle rect = System.Windows.Forms.SystemInformation.VirtualScreen;//获取屏幕高度，宽度
            progressBarExcelExport.Minimum = 0;
            progressBarExcelExport.Maximum = 100;
            panelBack.Top = 0;
            panelBack.Left = 0;
            panelBack.Width =  this.Width;
            panelBack.Height = this.Height;
            progressBarExcelExport.SetBounds((this.Width - this.Width / 2) / 2, this.Height / 2 - 100, this.Width / 2, 30);
            progressBarExcelExport.BackColor = Color.Green;
            panelBack.BringToFront();
            lblCaption.BringToFront();
            progressBarExcelExport.BringToFront();
            lblCaption.Left = progressBarExcelExport.Left+15 ;
            lblCaption.Top = progressBarExcelExport.Top-17;

            progressBar1.Show();
          
            //写入数值
            panelBack.Visible = true;
            lblCaption.Visible = true;
            Application.DoEvents();

        string oldCaption = "";
            long totalCount = dt.Rows.Count;
            long rowRead = 0;
            decimal percent = 0;

///在for循环中计算当前进度结果并显示

 for (int r = 0; r < dt.Rows.Count; r++)
            {
  
                percent = (decimal)(((decimal)100 * rowRead) / totalCount);
                this.lblCaption.Text = "正在导出数据[" + percent.ToString("0.00") + "%]...";
                progressBarExcelExport.Value = Convert.ToInt32(percent);
               Application.DoEvents();
            }

///进度走完关闭进度条

  this.lblCaption.Visible = false;
            this.lblCaption.Text = oldCaption;
            progressBarExcelExport.Hide();
            panelBack.Visible = false;