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Код


Class Launcher
{
         public override void Initialize()
        {
            base.Initialize();
            ........
            // Создается обьект в котором и стартует таймер(листинг ниже)
            bdiagnostics = new BDiagnostics(FilesList, this);
            //обьект состояния, пытаюсь использовать для синхронизации
            stateObj = new StateObjClass();
            bdiagnostics.StartAsyncTimer(stateObj);
            ........
         }        

        public void UpdateVisitStatus(long visitID, int percent)
        {
            if (!this.IsDisposed)
            {
                VisitItem VI = this.treeModel.GetVisitItem(visitID);
                if (VI != null)
                {
                    if (LauncherThread.IsAlive)
                        //после изменения этого поля срабатывает событие перерисовки инддикаторов, на котором и слетает исключение
                        VI.BufferingIndicatorValue = percent;
                }
            }
        }
}

Код



        public void StartAsyncTimer(StateObjClass stateObj)
        {            
            stateObj = new StateObjClass();
            stateObj.TimerRef = dxTimer;
            stateObj.Canceled = false;
            dxTimer = new Timer(dxTimer_Tick, stateObj, 0, dxTimerInterval);
        }

        void dxTimer_Tick(object sender)
        {
            StateObjClass stateObj = (StateObjClass) sender;
                if (stateObj.Canceled)
                {
                    return;
                }
            lock (filesInVisit)
            {
                checkDownloadedFiles(stateObj);
            }
        }

        private void checkDownloadedFiles(StateObjClass stateObj)
        {
            bool allFilesDownloaded = false;
            long allDownloadedFilesCount = 0;
            foreach (KeyValuePair<int, FilesForVisit> pair in filesInVisit)
            {
                FilesForVisit thisFilesForVisit;
                if (filesInVisit.TryGetValue(pair.Key, out thisFilesForVisit))
                {
                    allFilesDownloaded = (thisFilesForVisit.CountInPercent() >= 100);
                    if (!allFilesDownloaded)
                    {
                        thisFilesForVisit.CheckDownloadedFiles();
                        lock (stateObj)
                        {
                            if (! stateObj.Canceled && !Launcher.IsDisposed)
                                 // вызов метода контрола, описанного в предыдщем листинге, который генерирет исключение
                                 dxLauncher.UpdateVisitStatus(pair.Key, thisFilesForVisit.CountInPercent());
                        }
                    }
                    else
                    {
                        allDownloadedFilesCount += thisFilesForVisit.CountDownloadedFiles;
                    }
                }
            }
            if (allDownloadedFilesCount == filesInVisit.Count)
                this.StopAsyncTimer(stateObj);
        }

        public void StopAsyncTimer(StateObjClass stateObj)
        {
            lock (stateObj)
            {
                stateObj.Canceled = true;
            }
            dxTimer.Dispose();
            dxTimer = null;
        }