Question

我想访问MainWindowViewModel中MyUserControlViewModel属性的属性我就像这样绑定它。

我有一个UserControl，其中包含一个textbox，我希望公开此text的{{1}}属性，因此我添加了名为“SearchText”的依赖项属性即可。我的用户控件有自己的视图模型，其属性名称为textbox。我想将此属性绑定到commentText的{{1}}属性我有主窗口，我正在使用此用户控件。 MainWindow视图模型具有名为Text的属性，我想与我的用户控件的textBox绑定。

MyUserControl.xaml

Comment

这里我想将Text属性绑定到其视图的CommentText属性模型

MyUserControl.xaml.cs

SearchText

MyUserControlViewModel.cs

<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MyUserControl}}, Path=SearchText}"/>

MainWindow.xaml

/// <summary>
/// DependencyProperty for SearchText 
/// </summary>
public static readonly DependencyProperty SearchTextProperty =
        DependencyProperty.Register(
            "SearchText",
            typeof(string), 
            typeof(MyUserControl),
            new FrameworkPropertyMetadata(string.Empty,
                FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                new PropertyChangedCallback(SearchTextCallBack)));

/// <summary>
/// Initializes a new instance of the <see cref="MyUserControl"/> class.
/// </summary>
public MyUserControl()
{
      InitializeComponent();
}

/// <summary>
/// Gets or sets the Search Text. 
/// </summary>
/// <value> The Search Text. </value>
public string SearchText
{
     get { return GetValue(SearchTextProperty) as string; }
     set
      {
           SetValue(SearchTextProperty, value);
      }
}

/// <summary>
/// Search Text call back. 
/// </summary>
/// <param name="property"> The property. </param>
/// <param name="args">    
/// The <see cref="System.Windows.DependencyPropertyChangedEventArgs" /> instance containing
/// the event data.
/// </param>
public static void SearchTextCallBack(DependencyObject property, DependencyPropertyChangedEventArgs args)
{
     var myUserControl= property as MyUserControl;
     if (args.NewValue == null)
     {
          return;
     }
     if (myUserControl!= null)
     {
          myUserControl.SearchText = args.NewValue.ToString();
     }
}

MainWindowViewModel.cs

public string CommentText
{
    get
    {
        return _commentText;
     }
    set
     {
        _commentText = value;
     }
}

如何将依赖项属性和视图模型属性绑定到我的用户控件中的控件之一？

0 个答案: