Вы должны попытаться поймать необработанное исключение, как это
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;
...
#region Error handling
private void TaskSchedulerOnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
{
var newExc = new Exception("TaskSchedulerOnUnobservedTaskException", e.Exception);
LogUnhandledException(newExc);
}
private void CurrentDomainOnUnhandledException(object sender, UnhandledExceptionEventArgs e)
{
var newExc = new Exception("CurrentDomainOnUnhandledException", e.ExceptionObject as Exception);
LogUnhandledException(newExc);
}
internal static void LogUnhandledException(Exception exception)
{
try
{
const string errorFileName = "Fatal.log";
var libraryPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Resources); // iOS: Environment.SpecialFolder.Resources
var errorFilePath = Path.Combine(libraryPath, errorFileName);
var errorMessage = string.Format("Time: {0}\r\nError: Unhandled Exception\r\n{1}",
DateTime.Now, exception.ToString());
File.WriteAllText(errorFilePath, errorMessage);
}
catch
{
// just suppress any error logging exceptions
}
}
// If there is an unhandled exception, the exception information is diplayed
// on screen the next time the app is started (only in debug configuration)
[Conditional("DEBUG")]
private static void DisplayCrashReport()
{
const string errorFilename = "Fatal.log";
var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Resources);
var errorFilePath = Path.Combine(libraryPath, errorFilename);
if (!File.Exists(errorFilePath))
{
return;
}
var errorText = File.ReadAllText(errorFilePath);
var alertView = new UIAlertView("Crash Report", errorText, null, "Close", "Clear") { UserInteractionEnabled = true };
alertView.Clicked += (sender, args) =>
{
if (args.ButtonIndex != 0)
{
File.Delete(errorFilePath);
}
};
alertView.Show();
}
#endregion