带有 HierarchicalDataTemplate 的 WPF 树视图 - 项目不可选择

Question

我已经搜索了几个小时来解决这个问题。但没有运气。

我有 treeview（两个级别）。每个树视图项包含checkbox 和textblock。我已将命令绑定添加到文本块，添加后 treeviewitem 不可选择。

如何解决这个问题。

<TreeView ItemsSource="{Binding ProductCategories, Mode=TwoWay}">
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.ItemTemplate>                
        <HierarchicalDataTemplate ItemsSource="{Binding Products}">
            <StackPanel Orientation="Horizontal" Margin="0,5,0,0">                        
                <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay}"  Command="{Binding DataContext.ProductCategoriesCheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}">
                </CheckBox>
                <TextBlock Margin="5,0,0,0" Text="{Binding Category}" >
                    <TextBlock.InputBindings>
                        <MouseBinding Command="{Binding DataContext.ProductCategoriesSelectCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" MouseAction="LeftClick" CommandParameter ="{Binding Category}" />
                    </TextBlock.InputBindings>
                </TextBlock>
            </StackPanel>
            <HierarchicalDataTemplate.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Margin="0,5,0,0">
                        <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay}" Command="{Binding DataContext.ProductCheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}">
                        </CheckBox>
                        <TextBlock Margin="5,0,0,0" Text="{Binding Product.Name}">
                            <TextBlock.InputBindings>
                                <MouseBinding Command="{Binding DataContext.ProductSelectCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" MouseAction="LeftClick" CommandParameter ="{Binding Product.Name}" />
                            </TextBlock.InputBindings>                                    
                        </TextBlock>
                    </StackPanel>
                </DataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

没有 MouseBinding 的 Textbolck 可以正常工作。是否有任何其他控件可以用来代替带有单击命令绑定的文本块。

编辑
这是我从我的视图模型中实现的命令

    RelayCommand _productSelectCommand;
    public ICommand ProductSelectCommand
    {
        get
        {
            if ( _productSelectCommand == null)
            {
                 _productSelectCommand = new RelayCommand(param => ProductSelect((string)param));
            }
            return _productSelectCommand ;
        }
    }

    public void ProductSelect(string productName)
    {

    }

Answer 1

如果您使用来自MVVM Light Tollkit 的RelayCommand，您可以使用这个：

if ( _productSelectCommand == null)
{
     _productSelectCommand = 
                new RelayCommand(
                                   param => ProductSelect((string)param),
                                   p => true
                                );
}

或者当命令可以运行时实现你的相关逻辑。