WPF - 選擇器 - 自定義控件 - SelectionChanged事件不會觸發

Question

我是新來的自定義控件創建。我已經爲基於Selector類的新自定義控件奠定了一些基礎。我的理解是我應該使用這個類，因爲我需要控件擁有一個Items集合和處理選擇的能力。我相信更改ItemTemplate可能會覆蓋一些此功能，因爲我沒有在控制級別或應用程序級別收到SelectionChanged事件。我想如果我是對的，有某種SelectionRegion XAML標籤可以放入DataTemplate內部。我找不到這樣的運氣。在瀏覽谷歌一段時間之後，我已經準備好提問了。我錯過了什麼？以下是ItemTemplate標記。謝謝你的幫助。如果您能告訴我爲什麼TextBlock中的文本被括在圓括號中，即使數據不是，也要多謝。

<Setter Property="ItemTemplate"> 
    <Setter.Value> 
     <DataTemplate> 
      <Border BorderBrush="Black" BorderThickness="1"> 
       <TextBlock Text="{Binding}" Foreground="Black" Background="White" MinHeight="12" MinWidth="50"/> 
      </Border> 
     </DataTemplate> 
    </Setter.Value> 
</Setter> 

在一個評論者的要求，這裏是控制整個XAML至今：

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:SourceMedicalWPFCustomControlLibrary"> 
    <Style TargetType="{x:Type local:MultiStateSelectionGrid}"> 
     <Setter Property="ItemsPanel"> 
      <Setter.Value> 
       <ItemsPanelTemplate> 
        <WrapPanel/> 
       </ItemsPanelTemplate> 
      </Setter.Value> 
     </Setter> 
     <Setter Property="ItemTemplate"> 
      <Setter.Value> 
       <DataTemplate> 
        <Border BorderBrush="Black" BorderThickness="1"> 
         <TextBlock Text="{Binding Code}" Foreground="Black" Background="White" MinHeight="12" MinWidth="50" Padding="2" ToolTip="{Binding Description}"/> 
        </Border> 
       </DataTemplate> 
      </Setter.Value> 
     </Setter> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="{x:Type local:MultiStateSelectionGrid}"> 
        <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,0,0,0" Background="{TemplateBinding Background}"> 
         <ContentPresenter HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,0,0,0" Content="{TemplateBinding Content}"/> 
         <ItemsPresenter/> 
        </StackPanel> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 
</ResourceDictionary> 

而且貧血代碼隱藏，以及：

namespace SourceMedicalWPFCustomControlLibrary 
{ 
    public class MultiStateSelectionGridState 
    { 
     public Brush Background { get; set; } 
     public Brush Foreground { get; set; } 
     public Brush Border { get; set; } 
     public string Text { get; set; } 

     public MultiStateSelectionGridState() 
     { 
      Background = Brushes.White; 
      Foreground = Brushes.Black; 
      Border = Brushes.Black; 
      Text = String.Empty; 
     } 
    }; 

    public class MultiStateSelectionGrid : Selector 
    { 
     public static readonly DependencyProperty ContentProperty = 
      DependencyProperty.Register("Content", typeof(object), typeof(MultiStateSelectionGrid), 
      new FrameworkPropertyMetadata(null, 
        FrameworkPropertyMetadataOptions.AffectsRender | 
        FrameworkPropertyMetadataOptions.AffectsParentMeasure)); 

     public object Content 
     { 
      get { return (object)GetValue(ContentProperty); } 
      set { SetValue(ContentProperty, value); } 
     } 

     public static readonly DependencyProperty StatesProperty = 
      DependencyProperty.Register("States", typeof(List<MultiStateSelectionGridState>), typeof(MultiStateSelectionGrid), 
      new FrameworkPropertyMetadata(new List<MultiStateSelectionGridState>(), 
       FrameworkPropertyMetadataOptions.AffectsRender)); 

     public List<MultiStateSelectionGridState> States 
     { 
      get { return (List<MultiStateSelectionGridState>)GetValue(StatesProperty); } 
      set { SetValue(StatesProperty, value); } 
     } 

     static MultiStateSelectionGrid() 
     { 
      DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiStateSelectionGrid), new FrameworkPropertyMetadata(typeof(MultiStateSelectionGrid))); 
     } 

     public override void OnApplyTemplate() 
     { 
      base.OnApplyTemplate(); 
      this.SelectionChanged += new SelectionChangedEventHandler(MultiStateSelectionGrid_SelectionChanged); 
     } 

     void MultiStateSelectionGrid_SelectionChanged(object sender, SelectionChangedEventArgs e) 
     { 
      MessageBox.Show("Hi"); 
     } 
    } 
} 

Answer 1

從閱讀一些完整的不同控件的完整代碼示例，我相信我的答案是我這樣做都是錯誤的。相反，我需要在ControlTemplate中擁有像ListBox那樣的Selector控件。那麼，@JKing的建議會幫助我達到我需要的地方。實際問題的答案雖然是從使用Selector作爲基類到在控件的模板中具有選擇器的前述變化。謝謝您的幫助。

Answer 2

這裏我做的事。我使用自定義控件的應用模板函數，並添加一個句柄來選擇我想要的控件的chnaged事件。

簡單的樣品在這裏：

public event EventHandler<SelectionChangedEventArgs> YourControlSelectionChanged; 

private void Selector_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    if (ListSelectionChanged != null) { 
     ListSelectionChanged(sender, e); 
    } 
} 

public override void OnApplyTemplate() 
{ 
    base.OnApplyTemplate(); 
    //find or declare your control here, the x:name in xaml should be YourControl 
    YourControl== this.Template.FindName("YourControl", this) as YourControlType 
    YourControl.SelectionChanged += ResultListBox_SelectionChanged; 
} 

然後你可以綁定到你在XAML自定義控件類中聲明的公共事件（YourControlSelectionChanged）的名稱。

希望這有助於。