在网上查阅了很多相关资料，参照对比一番后自己整理了一下，做了个小例子。能够实现根据后台数据加载的进度在前台动态更新进度条、进度条在页面居中显示、在进度条内显示百分比，完成进度后隐藏进度条。个人感觉还是有一定的参考价值，贴出来先。
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Threading;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
private void beginProgress()
{
//根据ProgressBar.htm显示进度条界面
string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
StreamReader reader = new StreamReader(@templateFileName,System.Text.Encoding.GetEncoding("GB2312"));
string html = reader.ReadToEnd();
reader.Close();
Response.Write(html);
Response.Flush();
}
private void setProgress(int percent)
{
string jsBlock = "";
Response.Write(jsBlock);
Response.Flush();
}
private void finishProgress()
{
string jsBlock = "";
Response.Write(jsBlock);
Response.Flush();
}
private void Page_Load(object sender, System.EventArgs e)
{
beginProgress();
for (int i = 1; i <= 100; i++)
{
setProgress(i);
//此处用线程休眠代替实际的操作，如加载数据等
System.Threading.Thread.Sleep(50);
}
finishProgress();
}
}