public async Task <bool> CloseAsync(object args = null)
{
if (!_isOpen)
{
return(await RunFunctionIfOpenAsyncA(delegate { IsEnabledAllowed = false; }).ConfigureAwait(false));
}
lock (_ctsLocker)
{
_cts?.CancelSafe(true);
}
try
{
await _isOpenSemaphore.WaitAsync().ConfigureAwait(false);
if (_isOpen)
{
lock (_ctsLocker)
{
_cts?.Dispose();
_cts = null;
_cancToken = new CancellationToken(true); // CancellationToken is not nullable and not disposable
}
await UnregisterBackEventHandlersAsync();
IsEnabledAllowed = false;
IsOpen = false;
await CloseMayOverrideAsync(args).ConfigureAwait(false);
return(true);
}
}
catch (Exception ex)
{
if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore))
{
await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename);
}
}
finally
{
lock (_isOpenSemaphoreLocker)
{
SemaphoreSlimSafeRelease.TryDispose(_isOpenSemaphore);
_isOpenSemaphore = null;
}
}
return(false);
}
