Wpf 设置触发器';孩子的财产
如何将触发器设置为依赖于孩子的属性? 就像我想根据扩展器的ListView 有没有孩子 但我总是得到一个Comilor错误,HasItems无法解决Wpf 设置触发器';孩子的财产,wpf,xaml,triggers,styles,Wpf,Xaml,Triggers,Styles,如何将触发器设置为依赖于孩子的属性? 就像我想根据扩展器的ListView 有没有孩子 但我总是得到一个Comilor错误,HasItems无法解决 <Expander Header="Expand to add new ports"> <Expander.Resources> <Style TargetType="{x:Type Expander}"> <Style.Triggers> <Trigg
<Expander Header="Expand to add new ports">
<Expander.Resources>
<Style TargetType="{x:Type Expander}">
<Style.Triggers>
<Trigger Property="Content.HasItems" Value="False">
<Setter Property="Header" Value="No children" />
</Trigger>
</Style.Triggers>
</Style>
</Expander.Resources>
<ListView ItemsSource="{Binding Path=SomeItems}">
</ListView>
您可以使用
ElementName
使用绑定到列表视图的DataTrigger
:
<Expander>
<Expander.Resources>
<Style TargetType="{x:Type Expander}">
<Setter Property="Header" Value="Expand to add new ports" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=ListView, Path=HasItems}" Value="False">
<Setter Property="Header" Value="No children" />
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Resources>
<ListView x:Name="ListView" ItemsSource="{Binding Path=SomeItems}">
</ListView>
</Expander>
与此相反:
<Expander Header="Expand to add new ports">
您可以使用ElementName
使用绑定到列表视图的DataTrigger
:
<Expander>
<Expander.Resources>
<Style TargetType="{x:Type Expander}">
<Setter Property="Header" Value="Expand to add new ports" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=ListView, Path=HasItems}" Value="False">
<Setter Property="Header" Value="No children" />
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Resources>
<ListView x:Name="ListView" ItemsSource="{Binding Path=SomeItems}">
</ListView>
</Expander>
与此相反:
<Expander Header="Expand to add new ports">
您的代码中存在多个问题-
首先,您应该在style setter
中设置属性,而不是在本地声明它
其次,使用DataTrigger
代替触发器
<Expander>
<Expander.Style>
<Style TargetType="{x:Type Expander}">
<Setter Property="Header" Value="Expand to add new ports"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=SomeItems.Count}" Value="0">
<Setter Property="Header" Value="No children" />
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Style>
<ListView ItemsSource="{Binding Path=SomeItems}">
</ListView>
</Expander>
您的代码中存在多个问题-
首先,您应该在style setter
中设置属性,而不是在本地声明它
其次,使用DataTrigger
代替触发器
<Expander>
<Expander.Style>
<Style TargetType="{x:Type Expander}">
<Setter Property="Header" Value="Expand to add new ports"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=SomeItems.Count}" Value="0">
<Setter Property="Header" Value="No children" />
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Style>
<ListView ItemsSource="{Binding Path=SomeItems}">
</ListView>
</Expander>