4

在初始值设置为 true 后，我与切换按钮的双向绑定被分离。当我取消按钮时，它不再被绑定。

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（视图）并隐藏另一个。我需要做的是告诉我的底层视图模型该视图是隐藏的，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
4

2 回答 2

1

你确定它真的没有“绑定”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

于 2013-02-15T02:20:40.357 回答
0

似乎这是一个语法问题......它似乎根本没有绑定到你ViewModel。尝试这个：

<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>

您将其定义local namespace为：

xmlns:local="clr-namespace:WpfApplication1"

注意：替换WpfApplication1为您的命名空间的名称。

于 2013-02-15T03:22:23.250 回答