ASP.Net 上传进度条的实现方法

对于加载时间比较长的ASP.NET页面，我们可以在客户端浏览器中显示进度条来显示页面正在装载。下面就是具体的实现过程：

新建项目，名字为WebPortal，在项目类型中选择Visual C#项目或者Visual Basic项目都可； 
在模板类型中选择ASP.NET Web应用程序； 
位置里输入：http://localhost/WebPortal； 
添加新项：名字为ShowProgress的Web窗体。 
在您的Web窗体ShowProgress.aspx上添加任何其他的Web服务器控件。 
在ShowProgress.aspx上单击右键，点“查看代码”，在最上面输入： 
Visual C# .NET代码 

using System.Threading;
Visual Basic .NET代码 
Imports System.Threading
在Page_Load事件里输入： Visual C# .NET代码 
Response.Write("<div id='mydiv' >"); 
Response.Write("_"); 
Response.Write("</div>"); 
Response.Write("<script>mydiv.innerText = ';</script>"); 
Response.Write("<script language=javascript>;"); 
Response.Write("var dots = 0;var dotmax = 10;function ShowWait()"); 
Response.Write("{var output; output = '正在装载页面';dots++;if(dots>=dotmax)dots=1;"); 
Response.Write("for(var x = 0;x < dots;x++){output += '·';}mydiv.innerText = output;}"); 
Response.Write("function StartShowWait(){mydiv.style.visibility = 'visible'; "); 
Response.Write("window.setInterval('ShowWait()',1000);}"); 
Response.Write("function HideWait(){mydiv.style.visibility = 'hidden';"); 
Response.Write("window.clearInterval();}"); 
Response.Write("StartShowWait();</script>"); 
Response.Flush(); 
Thread.Sleep(10000);
Visual Basic .NET代码 
Response.Write("<div id='mydiv' >") 
Response.Write("_") 
Response.Write("</div>") 
Response.Write("<script>mydiv.innerText = ';</script>") 
Response.Write("<script language=javascript>;") 
Response.Write("var dots = 0;var dotmax = 10;function ShowWait()") 
Response.Write("{var output; output = '正在装载页面';dots++;if(dots>=dotmax)dots=1;") 
Response.Write("for(var x = 0;x < dots;x++){output += '·';}mydiv.innerText = output;}") 
Response.Write("function StartShowWait(){mydiv.style.visibility = 'visible'; ") 
Response.Write("window.setInterval('ShowWait()',1000);}") 
Response.Write("function HideWait(){mydiv.style.visibility='hidden';") 
Response.Write("window.clearInterval();}") 
Response.Write("StartShowWait();</script>") 
Response.Flush() 
Thread.Sleep(10000)
在ShowProgress.aspx窗体的html的中输入： 
<script> 
HideWait(); 
</script>

点在浏览器中查看即可