public static void SendEmail(CrashReport report, String attachment)
{
if (!Settings.CrashReportEmailEnabled)
{
return;
}
if (String.IsNullOrEmpty(Settings.CrashReportEmailAddress))
{
return;
}
var email = new MailMessage {
Sender = new MailAddress(CreateSenderEmailAddress())
};
email.To.Add(Settings.CrashReportEmailAddress);
email.Subject = report.Title;
email.Body = report.Body;
email.IsBodyHtml = true;
if (attachment != null)
{
email.Attachments.Add(new Attachment(attachment));
}
var smtp = new SmtpClient();
smtp.Send(email);
}
protected override void OnLoad(EventArgs e)
{
// This is the base page from which my custom error pages inherit. If an unhandled exception occurs here then
// my custom error page is not displayed to the user. Instead, the user sees the default ASP.NET Server Error
// page (the "Yellow Screen of Death"). In effect, if an unhandled exception occurs in the error page, then all
// my custom error handling is overridden, and the original exception details are lost.
// throw new DemoException("What happens to an unhandled exception in the custom error page?");
base.OnLoad(e);
_httpStatusCode = Int32.Parse(StatusCode.Value);
Response.StatusCode = _httpStatusCode;
if (!IsPostBack)
{
Form.Action = Request.Url.PathAndQuery;
if (_httpStatusCode == 404)
{
CrashReportTitle.Text = "Page Not Found";
CrashReportBody.Text = String.Empty;
ReportTitle.Value = "Page Not Found";
ReportBody.Value = String.Empty;
}
else
{
ReportTitle.Value = "Unhandled Exception";
ReportBody.Value = String.Empty;
var report = HttpContext.Current.Cache[ApplicationErrorModule.Settings.Names.CrashReportKey] as CrashReport;
if (report == null)
{
Exception ex = HttpContext.Current.Server.GetLastError() ?? new HttpUnhandledException("Server Error");
report = new CrashReport(ex);
}
CrashReportTitle.Text = report.Title;
CrashReportBody.Text = report.Body;
ReportTitle.Value = report.Title;
ReportBody.Value = report.Body;
NextSteps.EnableTechnicalInformation = true;
}
BrokenUrl.Text = GetBrokenUrl();
}
else
{
// If this is a postback then we're OK -- the user is submitting a quick question from the error page.
Response.StatusCode = 200;
}
}
static private String SaveCrashReport(CrashReport report, HttpRequest request, String action)
{
String path = CreateFilePath(request.Url.Host, action);
if (String.IsNullOrEmpty(path))
{
return(null);
}
String directory = Path.GetDirectoryName(path);
if (directory != null && !Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
File.WriteAllText(path, report.Body);
return(path);
}
private static String FormatException(Exception ex, CrashReport report, Int32 depth)
{
report.Title = ex.Message;
var sb = new StringBuilder();
if (ex.InnerException != null)
{
sb.Append(FormatException(ex.InnerException, report, depth - 1));
}
sb.AppendFormat("<tr><th colspan='2'><h3>Exception #{0}</h3></th></tr>", Math.Abs(depth) + 1);
if (!String.IsNullOrEmpty(ex.Source))
{
sb.AppendFormat("<tr><td class='label'>Source</td><td>{0}</td></tr>", ex.Source);
}
sb.AppendFormat("<tr><td class='label'>Message</td><td>{0}</td></tr>", FormatExceptionMessage(ex));
sb.AppendFormat("<tr><td class='label'>Stack Trace</td><td>{0}</td></tr>", FormatExceptionStackTrace(ex));
return(sb.ToString());
}
private static void ExceptionOccurred(Exception ex)
{
// If an unhandled exception is thrown here then this Application_Error event handler will re-catch it,
// wiping out the original exception, and it will not re-throw the exception -- so this line of code does
// not create an infinite loop (although it might appear to do so).
// throw new DemoException("What happens to an unhandled exception in ApplicationErrorModule.ExceptionOccurred?");
// If the current request is itself an error page then we need to allow the exception to pass through.
HttpRequest request = HttpContext.Current.Request;
if (Regex.IsMatch(request.Url.AbsolutePath, ErrorPagePattern))
{
return;
}
// Otherwise, we should handle the exception here
HttpResponse response = HttpContext.Current.Response;
CrashReport report = new CrashReport(ex);
// Save the crash report in the current cache so it is accessible to my custom error pages. The key used to
// index the cache includes the session ID, so it is session-safe. A session variable set here does not seem
// to be available in the error page's session state - although the session ID is available there.
if (HttpContext.Current.Cache != null)
{
HttpContext.Current.Cache[Settings.Names.CrashReportKey] = report;
}
// Save the crash report on the file system
String path = SaveCrashReport(report, request, null);
// Send the crash report to the programmers
try
{
SendEmail(report, path);
}
catch (Exception sendEmailException)
{
SaveCrashReport(new CrashReport(sendEmailException), request, "SendEmail");
}
// Write the crash report to the browser if there is no replacement defined for the HTTP response
if (!ReplaceResponse)
{
HttpContext.Current.Server.ClearError();
if (!String.IsNullOrEmpty(Settings.CrashReportUrl))
{
HttpContext.Current.Server.Transfer(Settings.CrashReportUrl);
}
else
{
try
{
response.Clear();
response.StatusCode = 500;
response.StatusDescription = "Server Error";
response.TrySkipIisCustomErrors = true;
response.Write(report.Body);
response.End();
}
catch { }
}
}
}
