如何在VB.Net 3.0中声明一个依赖属性

我的公司被困在.Net 3.0中。我试图解决的任务很简单，我需要将CheckBoxResolvesCEDAR的IsChecked属性绑定到我的Audio类中的CompletesCEDARWork。我对此的了解越多，似乎我必须将CompletesCEDARWork声明为依赖属性，但我无法找到这是如何完成的一个好例子。我找到了这个例子，但是当我粘贴到我的代码中时，GetValue出现“未定义”错误，而且我还没有成功找出MyCode应该代表什么。任何帮助/例子将不胜感激。如何在VB.Net 3.0中声明一个依赖属性

感谢

Public Shared ReadOnly IsSpinningProperty As DependencyProperty = DependencyProperty.Register("IsSpinning", GetType(Boolean), GetType(MyCode)) 

Public Property IsSpinning() As Boolean 
    Get 
     Return CBool(GetValue(IsSpinningProperty)) 
    End Get 
    Set(ByVal value As Boolean) 
     SetValue(IsSpinningProperty, value) 
    End Set 
End Property

这里是我的slimed下来音频类，因为它现在站立。

Imports System.Xml

进口系统进口System.IO 进口System.Collections.ObjectModel 进口System.ComponentModel

公共类音频

Private mXMLString As String 
Private mTarpID As Integer 
Private mStartTime As Date 
Private mEndTime As Date 
Private mAudioArray As Byte() 
Private mFileXMLInfo As IO.FileInfo 
Private mFileXMLStream As IO.FileStream 
Private mFileAudioInfo As IO.FileInfo 
Private mDisplayText As String 
Private mCompletesCEDARWork As Boolean 

Private Property CompletesCEDARWork() As Boolean 
    Get 
     Return mCompletesCEDARWork 
    End Get 
    Set(ByVal value As Boolean) 
     mCompletesCEDARWork = value 
    End Set 
End Property

，这里是我的XML DataTemplate中，我设定的捆绑。

<DataTemplate x:Key="UploadLayout" DataType="Audio"> 
        <Border BorderBrush="LightGray" CornerRadius="8" BorderThickness="1" Padding="10" Margin="0,3,0,0"> 
         <StackPanel Orientation="Vertical"> 
          <TextBlock Text="{Binding Path=DisplayText}"> 
          </TextBlock> 
          <StackPanel Orientation="Horizontal" VerticalAlignment="Center"> 
           <TextBlock Text="TARP ID" VerticalAlignment="Center"/> 

           <ComboBox x:Name="ListBoxTarpIDs" 
             ItemsSource="{Binding Path=TarpIds}" 
              SelectedValue="{Binding Path=TarpID}" 
              BorderBrush="Transparent" 
              Background="Transparent" > 
           </ComboBox> 

          </StackPanel> 
          <CheckBox x:Name="CheckBoxResolvesCEDAR" 
             Content="Resolves CEDAR Work" 
           IsChecked="{Binding ElementName=Audio,Path=CompletesCEDARWork,Mode=TwoWay}"/>          
             </StackPanel> 
        </Border> 
       </DataTemplate>

来源

2010-05-15 user38349

您只能声明从DependencyObject派生的类中的依赖项属性。这就是为什么你会得到“GetValue没有定义”。您应该阅读这篇关于依赖属性的基础文章以获取更多信息：http://msdn.microsoft.com/en-us/library/ms752914.aspx。

或者，您可以使用INotifyPropertyChanged而不是DP来告诉绑定该值已更改。

来源

2010-05-15 13:39:05

实现INotifyPropertyChanged的代码，它完美地工作。谢谢！ – user38349 2010-05-15 16:42:48

这里是我用来执行INotifyPropertyChanged

Public Class Audio 
Implements INotifyPropertyChanged 

Private mCompletesCEDARWork As Boolean 

Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged 

Public Property CompletesCEDARWork() As Boolean 
    Get 
     Return mCompletesCEDARWork 
    End Get 
    Set(ByVal value As Boolean) 
     mCompletesCEDARWork = value 
     NotifyPropertyChanged("CompletesCEDARWork") 
    End Set 
End Property 

Private Sub NotifyPropertyChanged(ByVal info As String) 
    RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info)) 
End Sub

来源

2010-05-15 16:43:56 user38349

如何在VB.Net 3.0中声明一个依赖属性

回答

相关问题