如何动态更新我的UI

本文关键字：更新 我的 UI 动态 何动态 | 更新日期: 2023-09-27 17:53:11

我已经看了几个有关动态ui的问题，但我仍然不明白我错过了什么。此外，我已经学习了如何使用任务的教程，但我的理解仍然有限。以下是我想要实现的:

我的应用程序正在后台做一些工作，但我希望我的UI是响应。我尝试了以下方法(参见代码)，但是UI直到调用分派器才开始更新。我希望UI状态为:

  1. 创建…——一旦CreatePivotTableButton被点击
  2. 建立连接…——在调用提供者之前。li>连接成功或连接失败取决于结果

  3. 。

     <!-- language: lang-cs -->
 private void CreatePivotTableButton(object sender, RoutedEventArgs e)
{
    this.StatusToBeDisplayed.Content = "Creating...";
    this.DescriptionLabel.IsEnabled = false;
    this.TextBlockBorder.IsEnabled = true; 
    List<CombinedData> items = (List<CombinedData>)CustomerComboBox.ItemsSource;
    List<int> selectedItems = new List<int>();
    foreach (CombinedData item in items)
    {
        if (item.IsSelected)
        {
            selectedItems.Add(item.ReferenceId);
        }
    }
    PCTProvider provider = new PCTProvider();
    ExportToExcel export = new ExportToExcel();
    ExcelAutomation excelAutomation = new ExcelAutomation();
    this.ResultTextBlock.Text = "Establishing Connection";
    DataTable generateReportDataTable = provider.GetReportData(selectedItems);
    Excel.Workbook workbook = export.ExportDataTableToExcel(generateReportDataTable);
    Task updateTask = Task.Factory.StartNew(() =>
    {
        Dispatcher.Invoke(new Action(() => excelAutomation.CreatePivotTable(workbook)));
    }).ContinueWith(result =>
    {
        Dispatcher.Invoke(new Action(() => this.StatusToBeDisplayed.Content = "Done!"));
        Dispatcher.Invoke(new Action(() => OriginalStatus()));
    }, TaskScheduler.FromCurrentSynchronizationContext());
}
我非常感谢你的时间和帮助。

如何动态更新我的UI

我认为你不需要ContinueWith和/或可能的TaskScheduler通过在Task中完成工作，您允许UI线程响应消息泵。您可能需要将CreatePivotTableButton的更多工作移到Task中。

试试这个:

private void CreatePivotTableButton(object sender, RoutedEventArgs e)
{
    this.StatusToBeDisplayed.Content = "Creating...";
    this.DescriptionLabel.IsEnabled = false;
    this.TextBlockBorder.IsEnabled = true; 
    // move the rest of the code into your Task to perform the work off the UI thread
    Task updateTask = Task.Factory.StartNew(() =>
    {
        List<CombinedData> items = (List<CombinedData>)CustomerComboBox.ItemsSource;
        List<int> selectedItems = new List<int>();
        foreach (CombinedData item in items)
        {
            if (item.IsSelected)
            {
                selectedItems.Add(item.ReferenceId);
            }
        }
        PCTProvider provider = new PCTProvider();
        ExportToExcel export = new ExportToExcel();
        ExcelAutomation excelAutomation = new ExcelAutomation();
        Dispatcher.Invoke(new Action(() => this.ResultTextBlock.Text = "Establishing Connection"));
        DataTable generateReportDataTable = provider.GetReportData(selectedItems);
        Excel.Workbook workbook = export.ExportDataTableToExcel(generateReportDataTable);
        excelAutomation.CreatePivotTable(workbook);
        Dispatcher.Invoke(new Action(() => this.StatusToBeDisplayed.Content = "Done!"));
        Dispatcher.Invoke(new Action(() => OriginalStatus()));
    });
}
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