爲什麼我的雙向WPF綁定變得分離？

Question

將初始值設置爲true後，我對雙向切換按鈕的雙向綁定會分離。當我解開按鈕時，它不再被綁定。

我有兩個開關按鈕：

<RadioButton x:Name="BackupButton" Style="{StaticResource {x:Type ToggleButton}}" DataContext="{Binding BackupVM}" IsChecked="{Binding Mode=TwoWay, Path=IsViewVisible}">Backup</RadioButton> 
<RadioButton x:Name="RestoreButton" Style="{StaticResource {x:Type ToggleButton}}">Restore</RadioButton> 

我在BackupViewModel（實例化爲BackupVM），我希望結合屬性：

private bool _IsViewVisible = true; 
public bool IsViewVisible 
{ 
     get { return _IsViewVisible; } 
     set 
     { 
      if (value != _IsViewVisible) 
      { 
       _IsViewVisible = value; 
       if (PropertyChanged != null) 
        PropertyChanged(this, new PropertyChangedEventArgs("IsViewVisible")); 
      } 
     } 
    } 

當一個被切換的I顯示特定用戶控制（查看）並隱藏其他。我需要做的是告訴我的底層視圖模型，該視圖是隱藏的，所以我可以停止刷新一些數據的計時器。在加載時設置IsChecked值後，由於某種原因，綁定會分離。以下是運行軌跡後的輸出：

System.Windows.Data Warning: 52 : Created BindingExpression (hash=9343812) for Binding (hash=58368655) 
System.Windows.Data Warning: 54 : Path: 'IsViewVisible' 
System.Windows.Data Warning: 57 : BindingExpression (hash=9343812): Default update trigger resolved to PropertyChanged 
System.Windows.Data Warning: 58 : BindingExpression (hash=9343812): Attach to   System.Windows.Controls.RadioButton.IsChecked (hash=17818390) 
System.Windows.Data Warning: 63 : BindingExpression (hash=9343812): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=9343812): Found data context element: RadioButton (hash=17818390) (OK) 
System.Windows.Data Warning: 74 : BindingExpression (hash=9343812): Activate with root item <null> 
System.Windows.Data Warning: 102 : BindingExpression (hash=9343812): Item at level 0 is null - no accessor 
System.Windows.Data Warning: 76 : BindingExpression (hash=9343812): TransferValue - got raw value {DependencyProperty.UnsetValue} 
System.Windows.Data Warning: 84 : BindingExpression (hash=9343812): TransferValue - using fallback/default value 'False' 
System.Windows.Data Warning: 85 : BindingExpression (hash=9343812): TransferValue - using final value 'False' 
System.Windows.Data Warning: 92 : BindingExpression (hash=9343812): Got PropertyChanged event from RadioButton (hash=17818390) for DataContext 
System.Windows.Data Warning: 75 : BindingExpression (hash=9343812): Deactivate 
System.Windows.Data Warning: 99 : BindingExpression (hash=9343812): Replace item at level 0 with {NullDataItem} 
System.Windows.Data Warning: 74 : BindingExpression (hash=9343812): Activate with root item BackupViewModel (hash=58266349) 
System.Windows.Data Warning: 104 : BindingExpression (hash=9343812): At level 0 - for BackupViewModel.IsViewVisible found accessor RuntimePropertyInfo(IsViewVisible) 
System.Windows.Data Warning: 100 : BindingExpression (hash=9343812): Replace item at level 0 with BackupViewModel (hash=58266349), using accessor RuntimePropertyInfo(IsViewVisible) 
System.Windows.Data Warning: 97 : BindingExpression (hash=9343812): GetValue at level 0 from BackupViewModel (hash=58266349) using RuntimePropertyInfo(IsViewVisible): 'True' 
System.Windows.Data Warning: 76 : BindingExpression (hash=9343812): TransferValue - got raw value 'True' 
System.Windows.Data Warning: 85 : BindingExpression (hash=9343812): TransferValue - using final value 'True' 
System.Windows.Data Warning: 75 : BindingExpression (hash=9343812): Deactivate 
System.Windows.Data Warning: 99 : BindingExpression (hash=9343812): Replace item at level 0 with {NullDataItem} 
System.Windows.Data Warning: 59 : BindingExpression (hash=9343812): Detach 

Answer 1

您確定它確實沒有「綁定」嗎？我有它發生在我身上，看上去就像它在你的失蹤......你有什麼指示

NotifyOnSourceUpdated =真

在{結合模式....}內容

Answer 2

它好像它是一個語法的東西......它似乎沒有約束你的ViewModel。試試這個：

<RadioButton Grid.Row="0" x:Name="BackupButton" Style="{StaticResource {x:Type ToggleButton}}" IsChecked="{Binding IsViewVisible, Mode=TwoWay}"> 
    Backup 
    <RadioButton.DataContext> 
     <local:BackupVM /> 
    </RadioButton.DataContext> 
</RadioButton> 

在其中定義local namespace爲：

xmlns:local="clr-namespace:WpfApplication1" 

注：與您的命名空間的名稱替換WpfApplication1。