<ListBox.ContextMenu>
<ContextMenu>
<MenuItem Header="Export NewtonSoftJson"
FontSize="50"
Foreground="Red"
Command="{Binding ExportNewtonJsonCmd}"
CommandParameter="{Binding RelativeSource={RelativeSource
Mode=FindAncestor,AncestorType={x:Type ContextMenu}},Path=PlacementTarget}"/>
<MenuItem Header="Export BinaryFormatter"
FontSize="50"
Foreground="Red"
Command="{Binding ExportBinaryFormatterCmd}"
CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type ContextMenu}},Path=PlacementTarget}"/>
</ContextMenu>
</ListBox.ContextMenu>
标签：PlacementTarget,CommandParameter,ContextMenu,Command,MenuItem,Path From： https://www.cnblogs.com/Fred1987/p/18419388