ASP.NET中关于上传附件的大小设置问题

Asp.net中，上传文件的默认大小是4096 KB，也就是4M，不过你可以在Web.config中更改这个数据

<httpRuntime maxRequestLength="10240"

         useFullyQualifiedRedirectUrl="true"

         executionTimeout="100"/>

那么此时就是10M的文件，当然你也可以把它修改的更大，但是不管改成多大都会有个极限，如果用户上传的文件比这个值大，就会出现程序Catch不到的异常，因为这个是在运行时才能够监测，如下的错误：

Action canceled
Internet Explorer was unable to link to the Web page you requested. The page might be temporarily unavailable.
Please try the following: Click the Refresh button, or try again later. If you have visited this page previously and you want to view what has been stored on your computer, click File, and then click Work Offline. For information about offline browsing with Internet Explorer, click the Help menu, and then click Contents and Index.

 虽然你在代码中控制了大小，不过程序在运行到这里之前已经崩溃了

// Attachment size is too larger

if(PersonPhoto.PostedFile.ContentLength > 10240)

{

    this.lblError.Text = "The file you selected is larger than 10MB";

    this.lblError.Visible = true;

    return;

}

大家有什么办法嘛？