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

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ASP.net 多线程 ASP .net UI

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;
}
}
}
}