コード例 #1
0
        /// <summary>
        /// The <see cref="BackgroundWorker.DoWork"/> event handler here waits on a semaphore if there
        /// are not status text items yet to process. If the semaphore has a non-zero value and we haven't
        /// been asked to close yet and there are pending status text items to be displayed, then we safely
        /// dequeue one and use the <see cref="BackgroundWorker.ReportProgress"/> event to notify the UI
        /// thread for this instance of the status text to display. We then wait for the minimum display
        /// timespan specified for the status text item before iterating.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            while (true)
            {
                // Wait on the semaphore, which will return if/as soon as there are status text items in
                // the queue or we've been allowed to close, otherwise will block indefinitely (no timeout).
                splashItemsSemaphore.WaitOne();

                SplashStatusTextItem statusTextItem = null;

                // Safely attempt to retrieve an item from the queue.
                lock (this.synchronisationObject)
                {
                    // If we're now allowed to close and there's nothing left in the queue then it's time to break.
                    if (this.allowToClose && this.splashTextQueue.Count == 0)
                    {
                        break;
                    }

                    statusTextItem = this.splashTextQueue.Dequeue();
                }

                // Use the report progress facility to communicate to this control's UI thread with the new status
                // text item to display.
                this.backgroundWorker.ReportProgress(0, statusTextItem);

                // If there's a non-zero timespan to keep the text displayed then sleep for that duration before continuing.
                if (statusTextItem.MinimumTimeSpanDisplayed > TimeSpan.Zero)
                {
                    Thread.Sleep(statusTextItem.MinimumTimeSpanDisplayed);
                }
            }
        }
コード例 #2
0
        /// <summary>
        /// <see cref="BackgroundWorker.ProgressChanged"/> event handler which updates the status text label
        /// with the supplied status text as provided from the background worker thread.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            SplashStatusTextItem statusTextItem = (SplashStatusTextItem)e.UserState;

            this.labelStatus.Text = statusTextItem.Text;
        }