Wpf 如何让DataTemplate绑定到父视图模型中的属性?
我有以下MainView.xaml文件,可以作为MVVM菜单切换器使用。我有这双:Wpf 如何让DataTemplate绑定到父视图模型中的属性?,wpf,data-binding,xaml,mvvm,Wpf,Data Binding,Xaml,Mvvm,我有以下MainView.xaml文件,可以作为MVVM菜单切换器使用。我有这双: Page1View/Page1ViewModel Page2View/Page2ViewModel 在myMainViewModel中,我用两个ViewModel填充一个ObservableCollection,然后当用户单击Next按钮时,它在MainViewModel中调用NextPageCommand,该命令用新的ViewModel关闭CurrentPageViewModel,然后以适当的视图显示,效果
- Page1View/Page1ViewModel
- Page2View/Page2ViewModel
PSEUDO-CODE:
<DataTemplate x:Key="CodeGenerationMenuTemplate">
<MenuItem
Command="{Binding <parentViewModel>.SwitchPageCommand}"
Header="{Binding Title}"
CommandParameter="{Binding Title}"/>
</DataTemplate>
伪代码:
以下是主视图模型:
<Window x:Class="TestMenu234.Views.MainView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:c="clr-namespace:TestMenu234.Commands"
xmlns:vm="clr-namespace:TestMenu234.ViewModels"
xmlns:v="clr-namespace:TestMenu234.Views"
Title="Main Window" Height="400" Width="800">
<Window.Resources>
<DataTemplate x:Key="CodeGenerationMenuTemplate">
<MenuItem Header="{Binding Title}" Command="{Binding SwitchPageCommand}" CommandParameter="{Binding Title}"/>
</DataTemplate>
<DataTemplate DataType="{x:Type vm:Page1ViewModel}">
<v:Page1View/>
</DataTemplate>
<DataTemplate DataType="{x:Type vm:Page2ViewModel}">
<v:Page2View/>
</DataTemplate>
</Window.Resources>
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="Code _Generation" ItemsSource="{Binding AllPageViewModels}"
ItemTemplate="{StaticResource CodeGenerationMenuTemplate}"/>
</Menu>
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
<Button Margin="5" Content="Next Page" Command="{Binding NextPageCommand}"/>
</StackPanel>
<ContentControl
Content="{Binding CurrentPageViewModel}"/>
</DockPanel>
</Window>
答案是:
<DataTemplate x:Key="CodeGenerationMenuTemplate">
<MenuItem
Header="{Binding Title}"
Command="{Binding DataContext.SwitchPageCommand,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Menu}}}"
CommandParameter="{Binding Title}"/>
</DataTemplate>
我刚刚看到Nir给了我解决上述问题的语法: