WPF绑定到IsSelected视图模型不设置那些不在列表中被证明项目 [英] WPF Binding IsSelected to ViewModel doesn't set items that haven't been shown in the List

问题描述

我有一个视图模型有我在 ListView控件绑定一个 IsSelected 属性.ItemContainerStyle XAML来在我看来，模型中的 IsSelected 属性。

I have a ViewModel that has an IsSelected property which I bind in my ListView.ItemContainerStyle XAML to an IsSelected property in my view model.

我提出申请，并填充视图模型集合（这是在我的显示的ListView ）有很多的项目，说一下2000。然后我选择的一切通过 CTRL-A 列表。在我看来，模型集合的项目只能获得 IsSelected 对于那些在的ListView 中可见的项目设置。如果我页面向下列表中的 IsSelected 被设置得到显示任何物品。如果通过所有的项目我页，然后在我看来，模型中的所有项目都在 IsSelected 属性设置为true。

I bring up the application and populate the view model collection (which is shown in my ListView) with a lot of items, say about 2000. Then I select everything in the list via Ctrl-A. The items in my view model collection only get the IsSelected set for the items that are visible in the ListView. If I page down through the list the IsSelected gets set for whatever items get shown. If I page through all the items then all the items in my view model have the IsSelected property set to true.

下面是我的XAML在列表视图绑定 IsSelected 我的视图模型：

Here is my XAML for binding the IsSelected in the list view to my view model:

<ListView Margin="5" ItemsSource="{Binding FilteredComparisonList}" x:Name="comparisonListView">
    <ListView.ItemContainerStyle>
        <Style TargetType="{x:Type ListBoxItem}">
            <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}" />
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Source filename" DisplayMemberBinding="{Binding ImageFile.BaseFilename}" Width="Auto" />
        </GridView>
    </ListView.View>
</ListView>

为什么不是 IsSelected 在我看来，模型中的所有项目设置为true，当我选择在 ListView中的所有项目？

Why isn't IsSelected for all the items in my view model set to true when I select all the items in the ListView?

推荐答案

的MVVM方式做，这将是覆盖按Ctrl-A快捷键与自己的选命令（用Ctrl-A的快捷方式创建一个SellectAll命令） 。实施将设置视图模型IsSelected。

The MVVM way to do this would be to override the Ctrl-A shortcut with your own SelectAll command (Create a SellectAll command with a shortcut of Ctrl-A). The implementation will set IsSelected on the view models.

在你看来你的IsSelected属性需要有一个双向绑定到您的视图模式，使项目出现在视图中选择。

Your IsSelected property in your view needs to have a two way binding to your view model so that the items appear selected in your view.

我不认为关闭虚拟化是所必要的。

I dont think turning off virtualisation is nessesary.

希望这有助于。

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