asp.net利用多线程执行长时间的任务，在客户端显示进度条

OStack程序员社区-中国程序员成长平台 › 门户 › 编程› c#›C#教程

原作者: [db:作者] 来自: [db:来源] 收藏邀请

<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>

后台代码

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;
   }
  }
}
}

原文章地址http://www.cnblogs.com/lovecherry/archive/2005/04/10/135090.html

以下为另一种方法

<head>
<script language="javascript">
function showMsg()
{
//alert("ok");
mydiv.style.visibility="hidden";
popupLoad.style.visibility="visible";
var moneyMsg = document.all.popupLoad;
//下面计算位置进行显示
moneyMsg.style.display = ""; //层显示
moneyMsg.style.top = document.body.scrollTop + document.body.clientHeight/2 - 50 // e.getBoundingClientRect().top + 20 + document.body.scrollTop;//ttop + h;
moneyMsg.style.left= document.body.clientWidth/2 - 100 // e.getBoundingClientRect().left + 20 + document.body.scrollLeft;//tleft + w - moneyMsg.clientWidth;
}
</script>
</head>
<body>
<form >
<div >
/************************
/***你的控件！！！*********
/************************
</div>

<div class="divcenter"
align="center" name="loadpop">
<table height="100%" cellSpacing="0" cellPadding="0" width="100%" align="center" border="0">
<tr>
<td vAlign="middle" align="center" width="100%">
<TABLE class="popload" style="FONT-SIZE: 11px; FILTER: Alpha(opacity=75); LINE-HEIGHT: 18px; TEXT-: left"
cellSpacing="1" cellPadding="5" bgColor="#c5c7c1" summary="Loader Layout" border="0">
<TBODY>
<TR>
<TD vAlign="middle" align="left" bgColor="#ffffff">
<P> <IMG style="MARGIN: 3px" height="32" alt="请等待" src="../images/clock.gif" width="32" align="left"> <STRONG>操作数据处理中... </STRONG> <BR>
<SPAN style="FONT-SIZE: 9pt">Please wait until this screen is completely loaded. </SPAN> </P>
</TD>
</TR>
</TBODY>
</TABLE>
</td>
</tr>
</table>
</div>
</form>
</body>

假如画面上，触发“检索数据”的是按钮button1的click事件，那么在page_load事件里加上下边这段
if(!IsPostBack)
{
button1.Attributes.Add("onClick","showMsg();");
}

说明：
1：画面中，有2个div。
<div > 用于盛放你的控件
<div class="divcenter" > 用于显示等待信息
2：当点击button1事，调用javascript的showMsg（）函数。该函数作用：隐藏mydiv，显示divcenter。