我尝试使用附加属性绑定。但是无法让它发挥作用。
public class Attached
{
public static DependencyProperty TestProperty =
DependencyProperty.RegisterAttached("TestProperty", typeof(bool), typeof(Attached),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Inherits));
public static bool GetTest(DependencyObject obj)
{
return (bool)obj.GetValue(TestProperty);
}
public static void SetTest(DependencyObject obj, bool value)
{
obj.SetValue(TestProperty, value);
}
}
XAML代码:
<Window ...>
<StackPanel local:Attached.Test="true" x:Name="f">
<CheckBox local:Attached.Test="true" IsChecked="{Binding (local:Attached.Test), Mode=TwoWay, RelativeSource={RelativeSource Self}}" />
<CheckBox local:Attached.Test="true" IsChecked="{Binding (local:Attached.Test), Mode=TwoWay}" />
</StackPanel>
</Window>
绑定错误:
System.Windows.Data Error: 40 : BindingExpression path error: '(local:Attached.Test)' property not found on 'object' ''StackPanel' (Name='f')'. BindingExpression:Path=(local:Attached.Test); DataItem='StackPanel' (Name='f'); target element is 'CheckBox' (Name=''); target property is 'IsChecked' (type 'Nullable`1')
答案 0 :(得分:149)
信不信由你,只需添加Path=
并在绑定到附加属性时使用括号:
IsChecked="{Binding Path=(local:Attached.Test), Mode=TwoWay, RelativeSource={RelativeSource Self}}"
此外,您对RegisterAttached
的调用应该将“Test”作为属性名称传递,而不是“TestProperty”。
答案 1 :(得分:18)
我更愿意将此作为对Kent答案的评论发布,但由于我没有足够的代表这样做...只是想指出,从WPF 4.5开始,添加Path=
isn不再需要了。但是附加的属性名称仍然需要用括号括起来。
答案 2 :(得分:-1)
放入括号即可。我必须将父contentcontrol
与textblock
中的datatemplate
进行自动化ID绑定。自动化ID是附加属性。
我将该属性放在方括号中,并且绑定有效。
AutomationProperties.AutomationId="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContentControl},Path=(AutomationProperties.AutomationId)}"