Silverlight 3 DataForm，如何显示/隐藏字段

我有一个DataForm，我已将某些DataField的可见性设置为折叠状态，并且当用户从ComboBox中选择一个选项时，某些DataField应该再次可见。Silverlight 3 DataForm，如何显示/隐藏字段

基本上（粗糙的伪代码）。

OnComboBoxChange = 
    if this.index = 1 then 
     DataForm.Fields[1].Visibility = Visible 
    else 
     DataForm.Fields[2].Visibility = Visible

适用于MVVM模式的答案的奖励分数。

来源

2009-08-03 ChadT

下面是一个使用MVVM一个样品，避免代码隐藏（有争议MVVM禁忌）：

<UserControl> 
    <StackPanel> 
    <ComboBox x:Name="comboBox" SelectionChanged="comboBox_SelectionChanged"/> 
    <StackPanel Orientation="Horizontal" Visibility="{Binding IsFirstFormShown}"> 
     <TextBlock Text="First: "/> 
     <TextBox/> 
    </StackPanel> 
    <StackPanel Orientation="Horizontal" Visibility="{Binding IsSecondFormShown}"> 
     <TextBlock Text="Second: "/> 
     <TextBox/> 
    </StackPanel> 
    </StackPanel> 
</UserControl>

这里的你的ViewModel然后，

public class MyFormViewModel : INotifyPropertyChanged 
{ 
    private System.Windows.Visibility _isFirstShown; 
    public System.Windows.Visibility IsFirstFormShown 
    { 
      get { return _isFirstShown; } 
      set 
      { 
       _isFirstShown = value; 
       if (PropertyChanged != null) 
       { 
        PropertyChanged(this, new PropertyChangedEventArgs(value)); 
       } 
      } 
    } 

    //TODO: implement the other property (writing code in this edit window makes me tired) 
    //hopefully you get the picture here... 
}

非常简单。我可能会试着将我的属性命名为“模型”而不是“视图”，但这个约定并不完全不适合。

来源

2009-08-03 16:48:21

在MVVM模式设置的上下文中，尽管我可以看到控件的可见性属于视图。无论如何，你的伪代码或多或少地完成了这项工作。下面是一些片段是多一点具体的：

<UserControl> 
    <StackPanel> 
    <ComboBox x:Name="comboBox" SelectionChanged="comboBox_SelectionChanged"/> 
    <StackPanel x:Name="firstPanel" Orientation="Horizontal"> 
     <TextBlock Text="First: "/> 
     <TextBox/> 
    </StackPanel> 
    <StackPanel x:Name="secondPanel" Orientation="Horizontal"> 
     <TextBlock Text="Second: "/> 
     <TextBox/> 
    </StackPanel> 
    </StackPanel> 
</UserControl>

和

public partial class MainPage : UserControl { 

    public MainPage() { 
    InitializeComponent(); 
    this.comboBox.ItemsSource = new String[] { "First", "Second" }; 
    this.comboBox.SelectedIndex = 0; 
    } 

    void comboBox_SelectionChanged(Object sender, SelectionChangedEventArgs e) { 
    ShowPanel((String) this.comboBox.SelectedItem); 
    } 

    void ShowPanel(String name) { 
    if (name == "First") { 
     this.firstPanel.Visibility = Visibility.Visible; 
     this.secondPanel.Visibility = Visibility.Collapsed; 
    } 
    else { 
     this.firstPanel.Visibility = Visibility.Collapsed; 
     this.secondPanel.Visibility = Visibility.Visible; 
    } 
    } 

}

来源

2009-08-03 15:02:02

Silverlight 3 DataForm，如何显示/隐藏字段

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