前言

        这个binding问题困扰了我几天时间了，弄了好的demo试了又试。之前老是认为是ItemsControl中数据模版DataTemplate中绑定Command问题，根据测试没问题。一直在考虑是否是绑定DataContext对象没指明同一个上下文对象问题。最后在MainWindow.xaml文件中Frame的属性Content 的Binding中加一个ElementName=Vm问题就解决了，

  页面切换效果：

<FrameworkElement.DataContext><local1:MainWindowViewModel x:Name="Vm" />
</FrameworkElement.DataContext><JcFrame Name="mainFrame" AnimationMode="RightToLeft"  Content="{Binding NavPage,ElementName=Vm}"  /><ItemsControl Grid.Row="1" Focusable="False" IsTabStop="False" ItemsSource="{Binding NavMenus}"><ItemsControl.ItemsPanel><ItemsPanelTemplate><StackPanel Grid.Row="1" Orientation="Vertical" /></ItemsPanelTemplate></ItemsControl.ItemsPanel><ItemsControl.ItemTemplate><DataTemplate ><!--<JcRadioButton GroupName="NavMenu" Style="{DynamicResource NavIconRadioButtonStyle}" Foreground="{Binding Path=GetThemeColor.Brush_Base1, Source={x:Static ThemeManager.Current}}" JcData="{Binding Icon}" JcDataChecked="{Binding CheckedIcon}" ToolTip="{Binding Text}" Command="{Binding NavCommand, ElementName=Vm}" CommandParameter="{Binding}" IsChecked="{Binding IsChecked}" Cursor="Hand" DisabledCursor="No" />--><!--Command="{Binding RelativeSource={RelativeSource AncestorType=Window, Mode=FindAncestor}, Path=DataContext.MouseLeftButtonDown }"/>--><JcRadioButton GroupName="NavMenu" Style="{DynamicResource NavIconRadioButtonStyle}" Foreground="{Binding Path=GetThemeColor.Brush_Base1, Source={x:Static ThemeManager.Current}}" JcData="{Binding Icon}" JcDataChecked="{Binding CheckedIcon}" ToolTip="{Binding Text}" Command="{Binding Path=NavCommand, ElementName=Vm}" CommandParameter="{Binding}" IsChecked="{Binding IsChecked}"  /></DataTemplate></ItemsControl.ItemTemplate>
</ItemsControl>