如何在VB.Net 3.0中聲明一個依賴屬性

我的公司被困在.Net 3.0中。我試圖解決的任務很簡單，我需要將CheckBoxResolvesCEDAR的IsChecked屬性綁定到我的Audio類中的CompletesCEDARWork。我對此的瞭解越多，似乎我必須將CompletesCEDARWork聲明爲依賴屬性，但我無法找到這是如何完成的一個好例子。我找到了這個例子，但是當我粘貼到我的代碼中時，GetValue出現「未定義」錯誤，而且我還沒有成功找出MyCode應該代表什麼。任何幫助/例子將不勝感激。如何在VB.Net 3.0中聲明一個依賴屬性

感謝

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

這裏是我的slimed下來音頻類，因爲它現在站立。

Imports System.Xml

進口系統進口System.IO 進口System.Collections.ObjectModel 進口System.ComponentModel

公共類音頻

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

，這裏是我的XML DataTemplate中，我設定的捆綁。

<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>

來源

2010-05-15 user38349

您只能聲明從DependencyObject派生的類中的依賴項屬性。這就是爲什麼你會得到「GetValue沒有定義」。您應該閱讀這篇關於依賴屬性的基礎文章以獲取更多信息：http://msdn.microsoft.com/en-us/library/ms752914.aspx。

或者，您可以使用INotifyPropertyChanged而不是DP來告訴綁定該值已更改。

來源

2010-05-15 13:39:05

實現INotifyPropertyChanged的代碼，它完美地工作。謝謝！ – user38349 2010-05-15 16:42:48

這裏是我用來執行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

來源

2010-05-15 16:43:56 user38349

如何在VB.Net 3.0中聲明一個依賴屬性

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