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wpf - 为什么我的双向 WPF 绑定(bind)变得分离?

转载 作者:行者123 更新时间:2023-12-03 15:51:35 25 4
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在初始值设置为 true 后,我与切换按钮的双向绑定(bind)被分离。当我取消按钮时,它不再被绑定(bind)。

我有两个切换按钮:

<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>

我希望绑定(bind)到的 BackupViewModel(例如 BackupVM)中的属性:
private bool _IsViewVisible = true;
public bool IsViewVisible
{
get { return _IsViewVisible; }
set
{
if (value != _IsViewVisible)
{
_IsViewVisible = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("IsViewVisible"));
}
}
}

当一个被切换时,我会显示一个特定的用户控件( View )并隐藏另一个。我需要做的是告诉我的底层 View 模型 View 是隐藏的,这样我就可以停止一个刷新一些数据的计时器。在加载时设置 IsChecked 值后,绑定(bind)由于某种原因被分离。这是运行跟踪后的输出:
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

最佳答案

你确定它真的没有“绑定(bind)”吗?我也遇到过这种情况,看起来好像在你的身上不见了......你没有任何迹象表明

NotifyOnSourceUpdated=true

在您的 {binding Mode.... } 内容中

关于wpf - 为什么我的双向 WPF 绑定(bind)变得分离?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14887045/

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