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：
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 description for _Default.
///
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);
}
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
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("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
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 description for Progress.
///
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.ToInt32(Session["State"].ToString());
}
else
{
Session["State"]=0;
}
if(state>0&&state<=10)
{
this.lblMessages.Text = "Task undertaking!";
this.panelProgress.Width = state*30;
this.lblPercent.Text = state*10 + "%";
Page.RegisterStartupscript("","");
}
if(state==100)
{
this.panelProgress.Visible = false;
this.panelBarSide.Visible = false;
this.lblMessages.Text = "Task Completed!";
Page.RegisterStartupscript("","");
}
}
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);
}
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
