将自定义DependencyProperty附加到WPF中的StackPanel？

我想使用自定义DependencyProperty（StackPanels不处理MouseEnter事件）在WPF中的堆栈面板的鼠标。将自定义DependencyProperty附加到WPF中的StackPanel？

我创建了一个类中的DependencyProperty像这样：

Public Class MouseEnterBehavior 
    Public Shared Property MouseEnterProperty As DependencyProperty = 
    DependencyProperty.RegisterAttached("MouseEnter", 
             GetType(ICommand), 
             GetType(MouseEnterBehavior), 
             New PropertyMetadata(Nothing, AddressOf MouseEnterChanged)) 

    Public Shared Function GetMouseEnter(ByVal obj As DependencyObject) As ICommand 
    Return CType(obj.GetValue(MouseEnterProperty), ICommand) 
    End Function 

    Public Shared Sub SetMouseEnter(ByVal obj As DependencyObject, ByVal value As ICommand) 
    obj.SetValue(MouseEnterProperty, value) 
    End Sub 

    Public Shared Sub MouseEnterChanged(ByVal obj As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs) 
    Dim element As UIElement = TryCast(obj, UIElement) 
    If element IsNot Nothing Then 
     AddHandler element.MouseEnter, AddressOf uiElement_MouseEnter 
    End If 
    End Sub 

    Public Shared Sub uiElement_MouseEnter(ByVal sender As Object, ByVal e As EventArgs) 
    Dim uiElement As UIElement = TryCast(sender, UIElement) 
    Dim command As ICommand = GetMouseEnter(uiElement) 
    If command IsNot Nothing And command.CanExecute(uiElement) Then 
     command.Execute(uiElement) 
    End If 
    End Sub 
End Class

我的视图看起来是这样的：

<Window x:Class="MainWindowView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:vm="clr-namespace:WpfApplication1" 
    Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <StackPanel Height="76" vm:MouseEnterBehavior.MouseEnterCommand="{Binding MouseEnteredCommand}" HorizontalAlignment="Left" Margin="212,117,0,0" VerticalAlignment="Top" Width="88" Background="#72000000" /> 
    </Grid> 
</Window>

我的视图模型是这样的：

Public Class MainWindowViewModel 
    Inherits ViewModelBase 
    Implements INotifyPropertyChanged 

    Private cmdMouseCommand As RelayCommand 

    Public ReadOnly Property MouseEnteredCommand As ICommand 
    Get 
     If cmdMouseCommand Is Nothing Then 
     cmdMouseCommand = New RelayCommand(AddressOf OnMouseEnterCommand) 
     End If 
     Return cmdMouseCommand 
    End Get 
    End Property 

    Private Sub OnMouseEnterCommand(ByVal obj As Object) 
    ''//Do something 
    End Sub 
End Class

更新

我能够获得编译和运行的代码，但不会发生绑定。我似乎无法弄清楚为什么。

来源

2010-07-07 Daniel

你已经注册的依赖属性为MouseEnter ed命令，但尝试绑定到MouseEnterCommand。

在旁注中，绑定不会使用您提供的Set调用来设置您的DependencyProperty;它会直接调用SetValue。您需要将回调传递给RegisterAttached，以便通知您。

来源

2010-07-07 21:46:38

非常感谢您的帮助。我想我已经开始明白这是如何运作的更好一点。我对上面的代码做了一些修改，显示了我为DP设置回调的尝试。但是，命令绑定似乎不会发生。我在每种方法上都加入了断点，并且没有一个被击中。任何想法我做错了什么？ – Daniel 2010-07-08 18:31:51

我相信这是你的问题：

DependencyProperty.RegisterAttached("MouseEnteredCommand", 
            GetType(ICommand), 
            GetType(MainWindowViewModel)

第一的GetType应该是属性的类型（你确定这里）
第二的GetType shuold是包含类的类型，在你的情况“MouseEnterBehavior”

来源

2010-07-07 21:46:12

将自定义DependencyProperty附加到WPF中的StackPanel？

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