带图标的MenuItem样式只创建一个图标

Question

我在使用viewmodels作为ItemsSource的动态菜单渲染图标时遇到问题.
我使用的解决方案概述了 MVVM Dynamic Menu UI与ViewModel的绑定

基本布局如下

<Grid>
  <Grid.Resources>
    <HierarchicalDataTemplate DataType="{x:Type ViewModels:HeaderedItemViewModel}"
        ItemsSource="{Binding Path=Children}">
      <ContentPresenter RecognizesAccessKey="True"></ContentPresenter>
    </HierarchicalDataTemplate>
    <Style TargetType="{x:Type MenuItem}">
      <Setter Property="Header" Value="{Binding Path=Header}" />
      <Setter Property="InputGestureText" Value="{Binding Path=InputGestureText}" />
      <Setter Property="Command" Value="{Binding Path=Command}" />
      <Setter Property="Icon">
        <Setter.Value>
          <Image Source="{Binding Path=Icon}" Height="16px" Width="16px" />
        </Setter.Value>
      </Setter>
    </Style>
  </Grid.Resources>
  <Menu Grid.Row="0" ItemsSource="{Binding Path=Shell.Navigation.Menus}" />
</Grid>

在上面的样式中,绑定'Icon'是'ImageSource'.其设置如下.

        BitmapImage image = null;

        if (!string.IsNullOrEmpty(imagePath))
        {
            image = new BitmapImage(new Uri(imagePath, UriKind.Relative));
            image.CacheOption = BitmapCacheOption.OnLoad;
            image.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
        }
        var menu = new HeaderedItemViewModel
                       {
                           Header = header,
                           InputGestureText = inputGesture,
                           ImagePath = imagePath,
                           Icon = image,
                           Command = command,
                           IsEnabled = isEnabled
                       };

我遇到的问题是图标.
似乎一次只会渲染一个图标？这是我的意思.

然后打开下拉菜单......

一旦渲染了另一个图像,第一个图像就会消失？换句话说,只有最后一个图像是可见的.菜单中的所有图像都会发生这种情况.有任何想法吗？

Answer 1

为您的Icon值添加x:Shared = false.为此,您应该在资源中声明Image:

<Grid>
  <Grid.Resources>

   <Image x:Key="imgCTX" x:Shared="false"
         Source="{Binding Path=Icon}" Height="16px" Width="16px"/>
    <HierarchicalDataTemplate DataType="{x:Type ViewModels:HeaderedItemViewModel}"
        ItemsSource="{Binding Path=Children}">
      <ContentPresenter RecognizesAccessKey="True"></ContentPresenter>
    </HierarchicalDataTemplate>
    <Style TargetType="{x:Type MenuItem}">
      <Setter Property="Header" Value="{Binding Path=Header}" />
      <Setter Property="InputGestureText" Value="{Binding Path=InputGestureText}" />
      <Setter Property="Command" Value="{Binding Path=Command}" />
      <Setter Property="Icon" Value="{StaticResource imgCTX}" />
    </Style>
  </Grid.Resources>
  <Menu Grid.Row="0" ItemsSource="{Binding Path=Shell.Navigation.Menus}" />
</Grid>