UI 不显示 WPF 项目中的 ProgressBar 进度

Question

我有一个 Planner 应用程序项目，当我从数据库中获取数据以向用户显示进度时，我创建了一个等待用户控件，因此我为此目的编写了以下代码：

    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;
        }));
    }

但我不知道为什么 UserControl 在从数据库检索到数据后加载并且它只在进度条中显示 100%，你能告诉我这里出了什么问题吗？ 请帮我解决这个问题。

Answer 1

我在这里找到了解决方案：Making a progress bar update in real time in wpf 谢谢你，格林杰德。 我的新代码：

        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);
        });