/// <summary>
/// This will terminate the app.
/// Is there any difference between this and Exception_OnClick?
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MakeTeaAsyncWithExceptionAndAsyncVoid_OnClick(object sender, RoutedEventArgs e)
{
BeforeMakingTea();
try
{
_finalMessage = new StringBuilder();
_finalMessage.AppendLine("Making tea started.");
MakeTeaAsyncWithException.MakeMeTeaAsyncVoidInTryCatch();
_finalMessage.AppendLine("After calling the method async");
Notes.Text = _finalMessage.ToString();
}
catch (Exception exception)
{
Notes.Text = exception.Message;
}
AfterMakingTea();
}
/// <summary>
/// Now, let's throw an exception inside an async method.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void MakeTeaAsyncWithException_OnClick(object sender, RoutedEventArgs e)
{
BeforeMakingTea();
try
{
_finalMessage = new StringBuilder();
_finalMessage.AppendLine("Making tea started.");
_finalMessage.AppendLine(await MakeTeaAsyncWithException.MakeMeTeaAsync());
Notes.Text = _finalMessage.ToString();
}
catch (Exception exception)
{
Notes.Text = exception.Message;
}
AfterMakingTea();
}
/// <summary>
/// Does the async keyword affect the Exception? If we remove the async keyword from the async task that we are executing
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void MakeTeaAsyncWithExceptionWithoutAwait_OnClick(object sender, RoutedEventArgs e)
{
BeforeMakingTea();
try
{
_finalMessage = new StringBuilder();
_finalMessage.AppendLine("Making tea started.");
// Will go inside the method. Will execute everything that has been established. When it reaches the await it will come back to the caller.
MakeTeaAsyncWithException.MakeMeTeaAsyncInTryCatch();
_finalMessage.AppendLine("After calling the method async");
Notes.Text = _finalMessage.ToString();
}
catch (Exception exception)
{
// Why we are not seeing the exception in the Notes?
// If we don't use the await keyword, the exception will be swallowed. await keyword will validate that the task
// completed successfully, but in this case, there's no await keyword. Moreover, there's no continuation and that's why we
// can see that is not "async" and the next message is shown.
Notes.Text = exception.Message;
}
AfterMakingTea();
}
