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将字典值绑定到UserControl WPF的依赖项属性

[英]Binding Dictionary Value to Dependency Property of a UserControl WPF

我试图将一个值作为一个tabcontrol的itemsource从Dictionary集中绑定到一个保存在TabControl.ContentTemplate中的UserControl的DependencyProperty。

在我的一生中,我无法绑定它,我强烈感觉到它可能与userControl'EnvironmentStateView'的DataContext有关,在这种情况下,它是一个视图模型。

在单独的TextBlock中,对字典键的绑定适用于集合中的每个项目,但不幸的是。

EnvironmentCollectionView.xaml

<TabControl Name="EnvironmentCollectionTabControl" ItemsSource="{Binding environmentCollection}">
      <TabControl.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Key}"></TextBlock>
            </DataTemplate>
      </TabControl.ItemTemplate>
      <TabControl.ContentTemplate>
          <DataTemplate>
                <local:EnvironmentStateView Grid.Column="0" Grid.Row="0" EnvironmentObject="{Binding Value}" EnvironmentKey="{Binding Key}"></local:EnvironmentStateView>
          </DataTemplate>
      </TabControl.ContentTemplate>
</TabControl>

EnvironmentStateView.xaml

/// <summary>
/// Interaction logic for EnvironmentStateView.xaml
/// </summary>
[Export(typeof(EnvironmentStateView))]
public partial class EnvironmentStateView : UserControl
{
    /// <summary>
    /// Environment object dependency property
    /// </summary>
    public static readonly DependencyProperty EnvironmentObjectProperty =
        DependencyProperty.Register(
            "EnvironmentObject",
            typeof(Framework.Environment),
            typeof(EnvironmentStateView),
            new PropertyMetadata(null));

    /// <summary>
    /// Environment key dependency property
    /// </summary>
    public static readonly DependencyProperty EnvironmentKeyProperty =
        DependencyProperty.Register(
            "EnvironmentKey",
            typeof(string),
            typeof(EnvironmentStateView),
            new PropertyMetadata(null));

    [ImportingConstructor]
    public EnvironmentStateView()
    {
        // Set data context
        this.DataContext = new EnvironmentStateViewModel();
        // Initialise
        InitializeComponent();
    }
    /// <summary>
    /// Gets or sets the environment object
    /// </summary>
    public Framework.Environment EnvironmentObject
    {
        get { return (Framework.Environment)GetValue(EnvironmentObjectProperty); }
        set { SetValue(EnvironmentObjectProperty, value); }
    }
    /// <summary>
    /// Gets or sets the environment key
    /// </summary>
    public string EnvironmentKey
    {
        get { return (string)GetValue(EnvironmentObjectProperty); }
        set { SetValue(EnvironmentObjectProperty, value); }
    }
}

尽管将其删除意味着它的datacontext为null,所以将environmentstateview的DataContext设置为视图模型,因此我想它不会继承任何东西。

我的目标是让environmentCollectionView在其viewmodel中使用environmentCollection Observable字典,将其作为itemsource绑定到Tabctronol,然后传递集合中的各个环境对象以分离用户控件,以处理与环境对象本身关联的特定视图/视觉效果。

我认为我能做到这一点的唯一方法是将字典值作为依赖项属性传递,以便每个用户控件都能完成其任务:),这可能是一种糟糕的方法。

任何帮助表示赞赏

问候沃尔夫

编辑*将UserControl更改为EnvironmentStateView

编辑*在修复上一个错误之后,我比注意到更多绑定错误信息快了

System.Windows.Data Error: 40 : BindingExpression path error: 'Key' property not found on 'object' ''EnvironmentStateViewModel' (HashCode=63276897)'. BindingExpression:Path=Key; DataItem='EnvironmentStateViewModel' (HashCode=63276897); target element is 'EnvironmentStateView' (Name=''); target property is 'EnvironmentKey' (type 'String')

System.Windows.Data Error: 40 : BindingExpression path error: 'Value' property not found on 'object' ''EnvironmentStateViewModel' (HashCode=32159097)'. BindingExpression:Path=Value; DataItem='EnvironmentStateViewModel' (HashCode=32159097); target element is 'EnvironmentStateView' (Name=''); target property is 'EnvironmentObject' (type 'Environment')

现在,Key和Value显然不在EnvironmentStateViewModel中,我想它是当前数据上下文。

我故意拼写错误地将EnvironmentTagTextBlock绑定到Keyy,这给了我绑定错误:

System.Windows.Data Error: 40 : BindingExpression path error: 'Keyy' property not found on 'object' ''KeyValuePair`2' (HashCode=-459631492)'. BindingExpression:Path=Keyy; DataItem='KeyValuePair`2' (HashCode=-459631492); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

所以我的猜测是我可能需要以某种方式将DataItem从EnvironmentStateViewModel更改为KeyValuePair`2,但我不知道如何或是否应该大声笑。

public static readonly DependencyProperty EnvironmentObjectProperty =
    DependencyProperty.Register(
        "EnvironmentObject",
        typeof(Framework.Environment),
        typeof(EnvironmentStateView),
        new PropertyMetadata(null));

父类不应该是EnvironmentStateView而不是UserControl吗?

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