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教你制做Web实时进度条

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增大字体作者：不详来源：不详发布时间：2006-8-14 8:25:49

网上已经有很多Web进度条的例子，但是很多都是估算时间，不能正真反应任务的真实进度。我自己结合多线程和ShowModalDialog制做了一个实时进度条，原理很简单：使用线程开始长时间的任务，定义一个Session，当任务进行到不同的阶段改变Session的值，线程开始的同时使用ShowModalDialog打开一个进度条窗口，不断刷新这个窗口获取Session值，反应出实时的进度。下面就来看看具体的代码：（文章结尾处下载源代码）

  先新建一个Default.aspx页面，
  客户端代码：

  <body MS_POSITIONING="GridLayout">
   <form id="Form1" method="post" runat="server">
   <br>
   <br>
   <asp:Button id="Button1" runat="server" Text="Start Long Task!"></asp:Button>
   </form>
  </body>
  服务器端代码：
  using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;
  using System.Text;

  namespace WebProgressBar
  {
   /**//// <summary>
   /// Summary description for _Default.
   /// </summary>
   public class _Default : System.Web.UI.Page
   {
   protected System.Web.UI.WebControls.Button Button1;

   private void Page_Load(object sender, System.EventArgs e)
   {
   // Put user code to initialize the page here
   }

   Web Form Designer generated code#region Web Form Designer generated code
   override protected void OnInit(EventArgs e)
   {
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
   }

   /**//// <summary>
   /// Required method for Designer support - do not modify
   /// the contents of this method with the code editor.
   /// </summary>
   private void InitializeComponent()
   {
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
   this.Load += new System.EventHandler(this.Page_Load);

   }
   #endregion

   private void LongTask()
   {
   //模拟长时间任务
   //每个循环模拟任务进行到不同的阶段
   for(int i=0;i<11;i++)
   {
   System.Threading.Thread.Sleep(1000);
   //设置每个阶段的state值，用来显示当前的进度
   Session["State"] = i+1;
   }
   //任务结束
   Session["State"] = 100;

   }

   public static void OpenProgressBar(System.Web.UI.Page Page)
   {
   StringBuilder sbScript = new StringBuilder();

   sbScript.Append("<script language='JavaScript' type='text/javascript'>\n");
   sbScript.Append("\n");
   sbScript.Append("</script>\n");

   Page.RegisterClientScriptBlock("OpenProgressBar", sbScript.ToString());
   }

   private void Button1_Click(object sender, System.EventArgs e)
   {
   System.Threading.Thread thread=new System.Threading.Thread(new System.Threading.ThreadStart(LongTask));
   thread.Start();

   Session["State"]=1;
   OpenProgressBar(this.Page);
   }
   }
  }


  新建一个进度条页面Progress.aspx
  客户端：
  在head中加入<base target="_self">
  <body MS_POSITIONING="GridLayout">
   <form id="Form1" method="post" runat="server">
   <asp:Label id="lblMessages" runat="server"></asp:Label>
   <asp:Panel id="panelBarSide" runat="server" Width="300px" BorderStyle="Solid" BorderWidth="1px"
   ForeColor="Silver">
   <asp:Panel id="panelProgress" runat="server" Width="10px" BackColor="Green"></asp:Panel>
   </asp:Panel>
   <asp:Label id="lblPercent" runat="server" ForeColor="Blue"></asp:Label>
   </form>
  </body>
  服务器端：
  using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;

  namespace WebProgressBar
  {
   /**//// <summary>
   /// Summary description for Progress.
   /// </summary>
   public class Progress : System.Web.UI.Page
   {
   protected System.Web.UI.WebControls.Label lblMessages;
   protected System.Web.UI.WebControls.Panel panelProgress;
   protected System.Web.UI.WebControls.Panel panelBarSide;
   protected System.Web.UI.WebControls.Label lblPercent;

   private int state = 0;
   private void Page_Load(object sender, System.EventArgs e)
   {
   // Put user code to initialize the page here
   if(Session["State"]!=null)
   {
   state = Convert.ToInt

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