我有一个看起来像这样的屏幕:
每个彩色区域都是放入 MainView.xaml 的不同 UserControl,如下所示:
<UserControl Name="TopDockPanel" DockPanel.Dock="Top" Content="{Binding QuickInfoVM, Source={StaticResource Locator}}" />
<UserControl Name="LeftDockPanel" DockPanel.Dock="Left" Content="{Binding NavigationVM, Source={StaticResource Locator}}" />
<UserControl Name="RightDockPanel" DockPanel.Dock="Right" Content="{Binding MainContentVM, Source={StaticResource Locator}}" />
(我使用的是 MVVMLight,所以 Locator 是 ViewModelLocator)
绿色区域是 ItemsControl 区域,显示每个项目(公司和员工)的按钮:
<UserControl x:Class="MvvmLightDemo.View.NavigationView"
Name="Navigation"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:MvvmLightDemo.View"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="120"
DataContext="{Binding MainContentVM, Source={StaticResource Locator}}" >
<StackPanel Background="CadetBlue">
<ItemsControl ItemsSource="{Binding PageViewModels}">
<ItemsControl.ItemTemplate>
<ItemContainerTemplate>
<Button Content="{Binding Name}"
Style="{StaticResource NavigationTextStyle}"
Command="{Binding ChangePageCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:NavigationView}}}" />
</ItemContainerTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</UserControl>
MainContentVM 包含 ChangePageCommand,如下所示:
public RelayCommand<IPageViewModel> ChangePageCommand
{
get
{
return _changePageCommand = new RelayCommand<IPageViewModel>(
p => ChangeViewModel((IPageViewModel)p),
p => p is IPageViewModel);
}
}
我的问题是,如何将 ItemContainerTemplate 中的按钮绑定到 MainContentVM 中的 ChangePageCommand?我所拥有的不起作用,在调试时单击任一按钮时永远不会调用 ChangePageCommand。
当我使用时Command="{Binding ChangePageCommand, RelativeSource={RelativeSource AncestorType={x:Type local:NavigationView}}}"
,不应该将 Command 的绑定设置为 NavigationView 的绑定(DataContext = MainContentVM)吗?