ASP.Net异常的捕获小结

1. 建立一个PageBase (class)，自定义OnError事件
2. 在Global.asax中自定义Application_Error事件
3. 在web.config中定义新的页面
   

   <customErrors mode="On" defaultRedirect="~/errors/GeneralError.aspx"/>

   
   自定义GeneralError.aspx捕获异常
4. 在HttpModule中自定义OnError事件

例子：

protected override void OnError(EventArgs e)
{
// At this point we have information about the error
HttpContext ctx = HttpContext.Current;

Exception exception = ctx.Server.GetLastError ();

string errorInfo = "
Offending URL: " + ctx.Request.Url.ToString () +
"
Source: " + exception.Source + 
"
Message: " + exception.Message +
"
Stack trace: " + exception.StackTrace;

ctx.Response.Write (errorInfo);

// --------------------------------------------------
// To let the page finish running we clear the error
// --------------------------------------------------
ctx.Server.ClearError ();

base.OnError (e);
}