How to understand asp.net error handling Application_Error events
This article introduces the relevant knowledge of "how to understand asp.net mishandling Application_Error events". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
An example of the ASP.NET error handling method Application_Error event is as follows:
Create a new web program-- create a new AppEvent.aspx page-- add the following code to the page:
The copy code is as follows:
Void Page_Load (object sender, System.EventArgs e)
{
Throw (new ArgumentNullException ())
}
Then, add the Application_Error event to the Global.asax file to catch the error raised in the Page_Load event of the AppEvent.aspx page. Add the following code to the Global.asax file:
The copy code is as follows:
Protected void Application_Error (object sender, EventArgs e)
{
Exception objErr = Server.GetLastError () .GetBaseException (); / / get error keleyi.com
String err = "Error Caught in Application_Error event/n" +
"Error in:" + Request.Url.ToString () +
/ nError Message: "+ objErr.Message.ToString () +
"/ nStack Trace:" + objErr.StackTrace.ToString ()
/ / write the captured errors to the application log of windows, which can be accessed from the event Viewer.
System.Diagnostics.EventLog.WriteEntry ("Test2", err, System.Diagnostics.EventLogEntryType.Error)
Server.ClearError (); / / clears the exception and no longer catches it elsewhere.
}
To save what you just did, in Visual Studio .NET, on the build menu, click build. Right-click the page, and then click View in the browser. In this case the page will be blank, but you should notice that a new entry has been added to the event log. This example generates an entry in the application log that can be accessed from the event viewer. After logging the error, you may want to redirect the user to another user-friendly error page or perform other actions as needed, which can be done as needed.
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