When a server error occurs in Asp.net, the specified error page is displayed, and the error information is written to the system log file.

1. Enter the page displayed when an error occurs in Web. config. Different error pages can be displayed based on different statuscode.

Code

<Customerrors mode = "on" defaultredirect = "/error/customerrorpage. aspx"> // off
<Error statuscode = "404" Redirect = "/error/404page. aspx"/>
<Error statuscode = "403" Redirect = "/error/403page. aspx"/>
</Customerrors>

 

2. Add the application error code to the Global. asax file and write it to the system log file.

Code

Protected void application_error (Object sender, eventargs E)
{
Exception lasterror = server. getlasterror ();
String errmessage = lasterror. tostring ();
String LogName = "MyLog ";
String Message = "Url" + Request. Path + "Error:" + ErrMessage;
// Create a log event name
If (! EventLog. SourceExists (LogName ))
{
EventLog. CreateEventSource (LogName, LogName );
}
EventLog Log = new EventLog ();
Log. Source = LogName; // Log name, which will be displayed in the Event Viewer
// The following are 5 events
Log. WriteEntry (Message, EventLogEntryType. Information, 1 );
Log. WriteEntry (Message, EventLogEntryType. Error, 2 );
Log. WriteEntry (Message, EventLogEntryType. Warning, 3 );
Log. writeentry (message, eventlogentrytype. successaudit, 4 );
Log. writeentry (message, eventlogentrytype. failureaudit, 5 );
}

 

3. An error is generated in default. aspx. cs. The default error page is displayed! Code

Private void page_load (Object sender, system. eventargs E)
{
Try
{
Int y = 0;
Int x = 1/y;
}
Catch (exception ERR)
{
Throw new exception ("404"); // I want to generate different errors, corresponding to statuscode in Web. config.
}
}