属性变化的多重颜色变化 - 如何实用地清除？

2 回答

• 1

  IHMO MVVM解决方案（如Rekshino提出的）肯定比非MVVM解决方案更好 . 视图模型应该注意跟踪修改后的数据 .

  无论如何，既然你继承了这个应用程序，你必须考虑转换整个代码所需的时间，有时候是不可能的 . 因此，在这种情况下，您可以在保存数据时强制每个单个多重绑定“刷新” .

  我们假设这是你的XAML（有两个或更多 TextBoxes ）：

  <StackPanel>
      <TextBox Margin="5" Text="{Binding DeviceObj.Name, Mode=TwoWay}">
          <TextBox.Background>
              <MultiBinding Converter="{StaticResource BackgroundColorConverter}">
                  <Binding Path="DeviceObj.Name" />
                  <Binding Path="DeviceObj.Name" Mode="OneTime" />
              </MultiBinding>
          </TextBox.Background>
      </TextBox>
  
      <TextBox Margin="5" Text="{Binding DeviceObj.Surname, Mode=TwoWay}">
          <TextBox.Background>
              <MultiBinding Converter="{StaticResource BackgroundColorConverter}">
                  <Binding Path="DeviceObj.Surname" />
                  <Binding Path="DeviceObj.Surname" Mode="OneTime" />
              </MultiBinding>
          </TextBox.Background>
      </TextBox>
  
      <Button Content="Save" Click="Button_Click" Margin="5,10,5,10" />
  </StackPanel>
  

  单击"Save" Button 时，可以强制MultiBindings以这种方式更新自己的目标：

  private void Button_Click(object sender, RoutedEventArgs e)
  {
      MultiBindingExpression multiBindingExpression;
  
      foreach (TextBox textBox in FindVisualChildren<TextBox>(this))
      {
          multiBindingExpression = BindingOperations.GetMultiBindingExpression(textBox, TextBox.BackgroundProperty);
          multiBindingExpression.UpdateTarget();
      }
  }
  

  您可以在this answer中找到 FindVisualChildren 实现 . 我希望它可以帮到你 .

  回复于 2024-05-03T05:49:54+08:00
• 1

  您必须将 bool Saved 属性粘贴到 DeviceObj 并处理它，如果 Name 或其他内容已更改 .

  ViewModel:

  public class Device : INotifyPropertyChanged
  {
      public string Name
      {
          get
          {
              return _name;
          }
          set
          {
              if (value != _name)
              {
                  _name = value;
                  Saved = false;
                  NotifyPropertyChanged(nameof(Name));
              }
          }
      }
      private string _name;
  
  
      public bool Saved
      {
          get
          {
              return _saved;
          }
          set
          {
              if (value != _saved)
              {
                  _saved = value;
                  NotifyPropertyChanged(nameof(Saved));
              }
          }
      }
      private bool _saved = true;
  
      public void Save()
      {
          //Saving..
          Saved = true;
      }
  
      public event PropertyChangedEventHandler PropertyChanged;
      public void NotifyPropertyChanged(string info)
      {
          PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(info));
      }
  }
  

  Converter:

  public class BoolToSolColBrushConverter : IValueConverter
  {
      private static SolidColorBrush changedBr = new SolidColorBrush(Colors.Red);
      private static SolidColorBrush unchangedBr = new SolidColorBrush(Colors.Green);
      public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
      {
          try
          {
              if ((bool)value)
              {
                  return unchangedBr;
              }
  
          }
          catch (Exception)
          {
          }
          return changedBr;
      }
  
      public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
      {
          throw new NotImplementedException();
      }
  

  XAML:

  <TextBox Text="{Binding Name}" Background="{Binding Saved, Converter={StaticResiurce BoolToSolColBrushConverter}}" />
  

  回复于 2024-05-03T05:49:54+08:00