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(原创)asp.net利用多线程执行长时间的任务,客户端显示出任务的执行进度的示例(二)

2005-04-10 16:36 671 查看
/article/4594000.html

对上一次的做一点修改,增加一个比较美观的进度显示



上面那个是运行中的画面,下面那个是结束后的画面



用到的图标在这里:


对上次的前台修改如下:

<%@ Page language="c#" Codebehind="WebForm54.aspx.cs" AutoEventWireup="false" Inherits="csdn.WebForm54" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

 <HEAD>

  <title>WebForm54</title>

  <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">

  <meta content="C#" name="CODE_LANGUAGE">

  <meta content="JavaScript" name="vs_defaultClientScript">

  <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">

  <style type="text/css">

  .font { FONT-WEIGHT: normal; FONT-SIZE: 9pt; COLOR: #000000; FONT-FAMILY: "宋体", sans-serif; BACKGROUND-COLOR: #f0f0f0; TEXT-DECORATION: none }

  </style>

 </HEAD>

 <body>

  <form id="Form1" method="post" runat="server">

   <div id="div_load" runat="server">

    <table width="320" height="72" border="1" bordercolor="#cccccc" cellpadding="5" cellspacing="1"

     class="font" style="FILTER: Alpha(opacity=80); WIDTH: 320px; HEIGHT: 72px">

     <TR>

      <TD>

       <P><IMG alt="请等待" src="clocks.gif" align="left">

        <BR>

        <asp:Label id="lab_state" runat="server"></asp:Label></P>

      </TD>

     </TR>

    </table>

    <BR>

   </div>

   <asp:Button id="btn_startwork" runat="server" Text="运行一个长时间的任务"></asp:Button><BR>

   <BR>

   <asp:Label id="lab_jg" runat="server"></asp:Label>

  </form>

 </body>

</HTML>

后台修改如下:

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Data.SqlClient;

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 csdn

{

 /// <summary>

 /// WebForm54 的摘要说明。

 /// </summary>

 public class WebForm54 : System.Web.UI.Page

 {

  protected System.Web.UI.HtmlControls.HtmlGenericControl div_load;

  protected System.Web.UI.WebControls.Button btn_startwork;

  protected System.Web.UI.WebControls.Label lab_state;

  protected System.Web.UI.WebControls.Label lab_jg;

  protected work w;

  private void Page_Load(object sender, System.EventArgs e)

  {

   // 在此处放置用户代码以初始化页面

   if(Session["work"]==null)

   {

    w=new work();

    Session["work"]=w;

   }

   else

   {

    w=(work)Session["work"];

   }

   switch(w.State)

   {

    case 0:

    {

     this.div_load.Visible=false;

     break;

    }

    case 1:

    {

     this.lab_state.Text=""+((TimeSpan)(DateTime.Now-w.StartTime)).TotalSeconds.ToString("0.00")+" 秒过去了,完成百分比:"+w.Percent+" %";

     this.btn_startwork.Enabled=false;

     Page.RegisterStartupScript("","<script>window.setTimeout('location.href=location.href',1000);</script>");

     this.lab_jg.Text="";

     break;

    }

    case 2:

    {

     this.lab_jg.Text="任务结束,并且成功执行所有操作,用时 "+((TimeSpan)(w.FinishTime-w.StartTime)).TotalSeconds+" 秒";

     this.btn_startwork.Enabled=true;

     this.div_load.Visible=false;

     break;

    }

    case 3:

    {

     this.lab_jg.Text="任务结束,在"+((TimeSpan)(w.ErrorTime-w.StartTime)).TotalSeconds+"秒的时候发生错误导致任务失败'";

     this.btn_startwork.Enabled=true;

     this.div_load.Visible=false;

     break;

    }

   }

  }

  #region Web 窗体设计器生成的代码

  override protected void OnInit(EventArgs e)

  {

   //

   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

   //

   InitializeComponent();

   base.OnInit(e);

  }

  

  /// <summary>

  /// 设计器支持所需的方法 - 不要使用代码编辑器修改

  /// 此方法的内容。

  /// </summary>

  private void InitializeComponent()

  {   

   this.btn_startwork.Click += new System.EventHandler(this.btn_startwork_Click);

   this.Load += new System.EventHandler(this.Page_Load);

  }

  #endregion

  private void btn_startwork_Click(object sender, System.EventArgs e)

  {

   if(w.State!=1)

   {

    this.btn_startwork.Enabled=false;

    this.div_load.Visible=true;

    w.runwork();

    Page.RegisterStartupScript("","<script>location.href=location.href;</script>");

            

   }

  }

 }

 public class work

 {

  public int State=0;//0-没有开始,1-正在运行,2-成功结束,3-失败结束

  public int Percent=0;//完成百分比

  public DateTime StartTime;

  public DateTime FinishTime;

  public DateTime ErrorTime;

  public void runwork()

  {

   lock(this)

   {

    if(State!=1)

    {

     State=1;

     StartTime=DateTime.Now;

     System.Threading.Thread thread=new System.Threading.Thread(new System.Threading.ThreadStart(dowork));

     thread.Start();                        

    }

   }

  }

  private void dowork()

  {

   try

   {

    SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);

    SqlCommand cmd=new SqlCommand("Insert Into test (test)values('test')",conn);

    conn.Open();

    for(int p=0;p<100;p++)

    {

     for(int i=0;i<10;i++)

     {

      cmd.ExecuteNonQuery();

     }

     Percent=p;//这里就是定义百分比,你估计这个操作费多少时间定义多少百分比

    }

    conn.Close();

    //以上代码执行一个比较消耗时间的数据库操作

    State=2;

   }

   catch

   {

    ErrorTime=DateTime.Now;

    Percent=0;

    State=3;

   }

   finally

   {

    FinishTime=DateTime.Now;

    Percent=0;

   }

  }

 }

}
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