Question

我在viewModel中有两个属性用于visiblity ContextMenu和ContextMenuItem。

   /// <summary>
    /// show context
    /// </summary>
    bool _showContext;
    public bool ShowContext
    {
        get { return _showContext; }
        set
        {
            if (value != _showContext)
            {
                _showContext = value;
                RaisePropertyChanged("ShowContext");
            }
        }
    }

       /// <summary>
    /// can archive
    /// </summary>
    bool _isArchiveContext;
    public bool IsArchiveContext
    {
        get { return _isArchiveContext; }
        set
        {
            if (value != _isArchiveContext)
            {
                _isArchiveContext = value;
                RaisePropertyChanged("IsArchiveContext");
            }
        }
    }

在Xaml中，我使用两种方法进行绑定。但是没有约束力。

 <ContextMenu x:Key="ItemContextMenu" Visibility="{Binding PlacementTarget.ShowContext,RelativeSource={RelativeSource AncestorType=ContextMenu},Converter={StaticResource ToVisibilityConverter}}">
<MenuItem Header=" بایگانی"
        Command="{Binding RelativeSource={RelativeSource AncestorType=ListView}, Path=ArchiveCommand}"  Visibility="{Binding RelativeSource={RelativeSource AncestorType=ListView}, Path=IsArchiveContext,Converter={StaticResource ToVisibilityConverter}}"
        CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=ListView}, Path=SelectedItems}" />




<ListView.ItemContainerStyle>
  <Style TargetType="{x:Type ListViewItem}" BasedOn="{StaticResource ListViewItemStyle}">
    <Setter Property="ContextMenu" Value="{StaticResource ItemContextMenu}" />
    </Style>
</ListView.ItemContainerStyle>

Answer 1

我用它。

<ContextMenu x:Key="ItemContextMenu" Visibility="{Binding DataContext.ShowContext,RelativeSource={RelativeSource AncestorType=Window},Converter={StaticResource ToVisibilityConverter}}">

Answer 2

我想告诉你的第一件事是，如果它是一个MVVM框架，你可以像这样绑定可见性

<ContextMenu x:Key="ItemContextMenu" Visibility="{Binding ShowContext},Converter={StaticResource ToVisibilityConverter}}">

我希望您已将ToVisibilityConverter放在类文件中

如何将ListViewItem的ContextMenu.Visibility绑定到viewmodel的属性？

2 个答案: