Catch all exceptions in Android (xamarin)

I use the code below here

Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread paramThread, Throwable paramThrowable) {
                // Catch your exception
                // Without System.exit() this will not work.
                System.exit(2);
            }
        });

I want to use it in C #. However, I can't find an equivalent method of this method in C #. I want to use toast. Maketext() to display errors to users

resolvent:

Try something like this –

AppDomain.CurrentDomain.UnhandledException += <Put your own delegate or handler>;
TaskScheduler.UnobservedTaskException += <Put your own delegate or handler here>;

Ideally, you want to perform this operation at a location that does not execute more than once during the execution of the program. If it is a xamarin.android application, you can put it in the oncreate method of the custom application class

If you want a code example, please check this link (I don't run the code myself, so I can't guarantee its correctness. Use it as a reference) – sample

// In MainActivity
protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);  

    AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
    TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;  

    Xamarin.Forms.Forms.Init(this, bundle);  
    DisplayCrashReport();  

    var app = new App();  
    LoadApplication(app);
}  

‪#‎region‬ Error handling
private static void TaskSchedulerOnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs unobservedTaskExceptionEventArgs)
{
    var newExc = new Exception("TaskSchedulerOnUnobservedTaskException", unobservedTaskExceptionEventArgs.Exception);
    LogUnhandledException(newExc);
}  

private static void CurrentDomainOnUnhandledException(object sender, UnhandledExceptionEventArgs unhandledExceptionEventArgs)
{
    var newExc = new Exception("CurrentDomainOnUnhandledException", unhandledExceptionEventArgs.ExceptionObject as Exception);
    LogUnhandledException(newExc);
}  

internal static void LogUnhandledException(Exception exception)
{
    try
    {
        const string errorFileName = "Fatal.log";
        var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal); // 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);  

        // Log to Android Device Logging.
        Android.Util.Log.Error("Crash Report", errorMessage);
    }
    catch
    {
        // just suppress any error logging exceptions
    }
}  

/// <summary>
// If there is an unhandled exception, the exception information is diplayed 
// on screen the next time the app is started (only in debug configuration)
/// </summary>
[Conditional("DEBUG")]
private void DisplayCrashReport()
{
    const string errorFilename = "Fatal.log";
    var libraryPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
    var errorFilePath = Path.Combine(libraryPath, errorFilename);

    if (!File.Exists(errorFilePath))
    {
        return; 
    }

    var errorText = File.ReadAllText(errorFilePath);
    new AlertDialog.Builder(this)
        .SetPositiveButton("Clear", (sender, args) =>
        {
            File.Delete(errorFilePath);
        })
        .SetNegativeButton("Close", (sender, args) =>
        {
            // User pressed Close.
        })
        .SetMessage(errorText)
        .SetTitle("Crash Report")
        .Show();
} 

‪#‎endregion‬  

//iOS: Different than Android. Must be in FinishedLaunching, not in Main.
// In AppDelegate
public override bool FinishedLaunching(UIApplication uiApplication, NSDictionary options)
{
    AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
    TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;  
    ...
}  

/// <summary>
// If there is an unhandled exception, the exception information is diplayed 
// on screen the next time the app is started (only in debug configuration)
/// </summary>
[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();
}