Question

I have created a WPF UserCotrol. Inside of it I have 3 Grids that are by default
visibility="collapsed". I have created a dependency property like this:

public int PanelId
    {
        get { return (int)GetValue(PanelIdProperty); }
        set { SetValue(PanelIdProperty, value); }
    }

public static readonly DependencyProperty PanelIdProperty =
        DependencyProperty.Register("PanelId", typeof(int), typeof(RecurrencePattern), new UIPropertyMetadata(1));

我想在另一个Xaml中利用这一用户控制。我宣布:

<uc:RecurrencePattern PanelId="2"/>

I thought that by doing this the PanelId would be 2 and in the default constructor when run I could use it to set what panel will be visible. Instead the PanelId is 1 as defined by UIPropertyMetadata(1). How can I use the value provided in xaml to set the which grid to be visible. I have:

<Grid x:Name="a" Visibility="Collapsed">
    <label Content"a"/>  
</Grid>
<Grid x:Name="b" Visibility="Collapsed">
    <label Content"b"/>  
</Grid>
<Grid x:Name="c" Visibility="Collapsed">
    <label Content"c"/>  
</Grid>

在违约情况下,被告是:

switch (PanelId)
  {
    case 1:
      a.Visibility = System.Windows.Visibility.Visible;
      break;
    case 2:
      b.Visibility = System.Windows.Visibility.Visible;
      break;
    case 3:
      c.Visibility = System.Windows.Visibility.Visible;
      break;
    default:
      a.Visibility = System.Windows.Visibility.Visible;
      break;
}

谢谢。

Answer 1

《<代码>出入的变更需要在变换的扶养财产中发生......。

  public static readonly DependencyProperty PanelIdProperty
     = DependencyProperty.Register(
          "PanelId",
          typeof(int),
          typeof(RecurrencePattern),
          new UIPropertyMetadata(1, PanelIdPropertyChangedCallback)); 

    private static void PanelIdPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var recurrencePattern = d as RecurrencePattern;
        if (recurrencePattern != null)
        {
            var panelId = Convert.ToInt32(e.NewValue);
            switch (panelId)
            {
                case 1:
                    recurrencePattern.Visibility
                       = System.Windows.Visibility.Visible;
                    break;
                case 2:
                    recurrencePattern.Visibility
                       = System.Windows.Visibility.Visible;
                    break;
                case 3:
                    recurrencePattern.Visibility 
                       = System.Windows.Visibility.Visible;
                    break;
                default:
                    recurrencePattern.Visibility 
                       = System.Windows.Visibility.Visible;
                    break;
            }
        }
    }

希望有助于......

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