在两个ListView中仅选择一项 [英] Select only one item in two ListViews

问题描述

我有两个 ListView ，每个都绑定到ViewModel中的特定集合，并且我希望只能在全局范围内选择一个项目.

I have two ListView, each bound to a specific collection in my ViewModel and I want to be able to select only one item globally.

每个 ListView 的 SelectedItem 属性都绑定到ViewModel中的相同属性.

Each ListView has its SelectedItem property bound to the same property in the ViewModel.

我的问题如下:当我在 ListView 中选择一个项目，然后在另一个 ListView 中选择另一个项目时，第一个项目保持选中状态.我可以通过一些隐藏的代码来实现，但是我想知道是否存在纯XAML解决方案.

My probleme is as follow: when I select an item in a ListView, and then select another item in the other ListView, the first item stays selected. I could achieve this with some code-behind, but I want to know if a pure XAML solution exists.

XAML:

<ListView SelectionMode="Single" ItemsSource="{Binding Path=MyList1}" SelectedItem="{Binding Path=MySelectedItem}">
   <ListView.ItemTemplate>
        <DataTemplate>
             <TextBlock Text="{Binding Name}" />
        </DataTemplate>
   </ListView.ItemTemplate>
</ListView>
<ListView SelectionMode="Single" ItemsSource="{Binding Path=MyList2}" SelectedItem="{Binding Path=MySelectedItem}">
   <ListView.ItemTemplate>
        <DataTemplate>
             <TextBlock Text="{Binding Title}" />
        </DataTemplate>
   </ListView.ItemTemplate>
</ListView>

推荐答案

我终于通过将 SelectedItem 替换为 SelectedValue 来使它正常工作.

I finally got it working, by just replacing SelectedItem by SelectedValue.

在此用例中，两个属性具有相同的行为，但是如果绑定的选定项不在列表中，则后一个属性可以正确处理取消选择.

In this use case, both properties have the same behaviour, but the latter one handles correctly the unselection if the bound selected item is not in the list.

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