UI 不顯示 WPF 項目中的 ProgressBar 進度

Question

我有一個 Planner 應用程序項目，當我從數據庫中獲取數據以向用戶顯示進度時，我創建了一個等待用戶控件，因此我為此目的編寫了以下代碼：

    public void LoadDestinationList()
    {
        Dispatcher.Invoke(new Action(() =>
        {
            WS_PPB.Value = 10;
            RDFDB_Class MyClass = new RDFDB_Class(TaskType);
            WS_PPB.Value = 25;
            Thread MyThread = new Thread(new ThreadStart(MyClass.LoadDataFromDb));
            WS_PPB.Value = 40;
            MyThread.IsBackground = true;
            MyThread.Start();
            WS_PPB.Value = 55;
            while (MyThread.IsAlive)
            {
                WS_PPB.Value = 75;
            }
            WS_PPB.Value = 100;
        }));
    }

但我不知道為什么在從數據庫檢索數據后加載 UserControl 並且它只在進度條中顯示 100%，你能告訴我這里有什么問題嗎？ 請幫我解決這個問題。

Answer 1

我在這里找到了解決方案：在 wpf 中實時更新進度條，謝謝 greenjaed。 我的新代碼：

        await Task.Run(() => 
        {

            WSMainUC.WS_PPB.Dispatcher.Invoke(() => WS_PPB.Value = 15, DispatcherPriority.Background);
            RDFDB_Class MyClass = new RDFDB_Class(TaskType);
            WSMainUC.WS_PPB.Dispatcher.Invoke(() => WS_PPB.Value = 30, DispatcherPriority.Background);
            Thread MyThread = new Thread(new ThreadStart(MyClass.LoadDataFromDb));
            MyThread.IsBackground = true;
            MyThread.Start();
            WSMainUC.WS_PPB.Dispatcher.Invoke(() => WS_PPB.Value = 50, DispatcherPriority.Background);
            while (MyThread.IsAlive)
            {
                WSMainUC.WS_PPB.Dispatcher.Invoke(() => WS_PPB.Value = 75, DispatcherPriority.Background);
            }
            WSMainUC.WS_PPB.Dispatcher.Invoke(() => WS_PPB.Value = 100, DispatcherPriority.Background);
        });