将初始值设置为true后,我对双向切换按钮的双向绑定会分离。当我解开按钮时,它不再被绑定。为什么我的双向WPF绑定变得分离?
我有两个开关按钮:
<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>
我在BackupViewModel(实例化为BackupVM),我希望结合属性:
private bool _IsViewVisible = true;
public bool IsViewVisible
{
get { return _IsViewVisible; }
set
{
if (value != _IsViewVisible)
{
_IsViewVisible = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("IsViewVisible"));
}
}
}
当一个被切换的I显示特定用户控制(查看)并隐藏其他。我需要做的是告诉我的底层视图模型,该视图是隐藏的,所以我可以停止刷新一些数据的计时器。在加载时设置IsChecked值后,由于某种原因,绑定会分离。以下是运行轨迹后的输出:
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
我试过了,它也不起作用。我知道它是负载的,因为我可以验证调试器中调用getter。但是当我点击另一个按钮时,setter从不会被调用。 – JRadness 2013-02-15 17:21:30
@JRadness,是的,你是正确的,它将在调试时第一次通过“Getter”绑定。但是,您需要告诉控件...除了第一次启动时,我希望此绑定的另一侧告诉我它何时更改,以便我可以再次更新。这就是“NotifyOnSourceUpdated = true”的意思。不要让VS2010在我面前,但是还有一些其他部分需要与您需要的绑定类似。 – DRapp 2013-02-15 22:08:38