在global.asax中捕获特定错误

Question

我在全局asax中使用Application_Error事件来捕获错误并将它们写入文件。我可以看到在网页中特定的异常，但在日志文件中的所有我看到的是一个普通的错误是这样的：

Exception of type 'System.Web.HttpUnhandledException' was thrown. 
    at System.Web.UI.Page.HandleError(Exception e) 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest() 
    at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) 
    at System.Web.UI.Page.ProcessRequest(HttpContext context) 
    at ASP.review_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\...\ff7eee7c\ff24ade1\App_Web_tddyd4bt.3.cs:line 0 
    at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 

我怎么能写错误，我在黄色的页面中看到日志文件，而不是这个一般的错误？

Answer 1

这是你在找什么？

Exception ex = Server.GetLastError();  
String ExceptionMessage = (ex.InnerException != null) ? ex.InnerException.Message : ex.Message; 

Answer 2

在Global.asax中，找到的Application_Error方法，并添加以下内容：

protected void Application_Error(object sender, EventArgs e) 
    { 
     Exception ex = Server.GetLastError(); 
     LogHelper.WriteLog(ex); 
    } 

你需要创建一个类来写日志..

public class LogHelper 
{ 
    public static void WriteLog(Exception exception) 
    { 
     //write to text file the exception.Message ... 
    } 
}