鍵綁定標簽

Question

我有一個具有以下定義的TreeView ：

<TreeView ItemsSource="{Binding Folders, UpdateSourceTrigger=PropertyChanged}" x:Name="tree">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Folders, UpdateSourceTrigger=PropertyChanged}">
            <Label Content="{Binding Name}" >
                <Label.InputBindings>
                    <KeyBinding Key="Delete"
                                Command="{Binding DataContext.DeleteFolderCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"/>
                    <MouseBinding MouseAction="LeftDoubleClick"
                                  Command="{Binding DataContext.SelectFolderCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"
                                  CommandParameter="{Binding ElementName=tree, Path=SelectedItem}" />
                </Label.InputBindings>
            </Label>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

該視圖包含在具有以下內容的代碼隱藏文件中：

DataContext="{Binding RelativeSource={RelativeSource Self}}"

LeftDoubleClick的InputBinding可以LeftDoubleClick工作。

但是'Delete'鍵的InputBinding不起作用。

該Command在KeyBinding綁定到的樣子：

public ICommand DeleteFolderCommand
{
    get { return _deleteFolderCommand; }
    set
    {
        _deleteFolderCommand = value;
        OnPropertyChanged();
    }
}

在構造函數中，我定義：

DeleteFolderCommand = new RelayCommand(DeleteFolder);

和DeleteFolder-Method看起來像：

private void DeleteFolder(object parameter)
{
  // Break-Point here will not be reached                
}

我究竟做錯了什么？

我已經檢查了“輸出窗口”中的“綁定錯誤”，但是沒有。

Answer 1

我通過直接在TreeView處理KeyBinding管理它

<TreeView ItemsSource="{Binding Folders, UpdateSourceTrigger=PropertyChanged}" x:Name="tree">
    <TreeView.InputBindings>
        <KeyBinding Key="Delete" Command="{Binding DataContext.DeleteFolderCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"/>
    </TreeView.InputBindings>
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Folders, UpdateSourceTrigger=PropertyChanged}">
            <Label Content="{Binding Name}">
                <Label.InputBindings>
                    <MouseBinding MouseAction="LeftDoubleClick"
                                Command="{Binding DataContext.SelectFolderCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"
                                CommandParameter="{Binding ElementName=tree, Path=SelectedItem}" />
                </Label.InputBindings>
            </Label>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>