WPF 如何在ViewModel中获取ListView 的 SelectedItems

程序员文章站 2022-07-13 23:01:50

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貌似ListView并不支持直接对SelectedItems进行绑定，只能通过其他Command对SelectedItems进行参数传递。

方法一：通过Button的CommandParameter进行传递。

<ListBox x:Name="listbox" ItemsSource="{Binding StringList}" SelectionMode="Multiple"/>
<Button Command="{Binding GetListItemsCommand}" CommandParameter="{Binding SelectedItems, ElementName=listbox}" Content="GetSelectedListBoxItems"/>

方法二：通过System.Windows.Interactivity进行传递

xmlns:i="http://schemas.microsoft.com/expression//2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"

<GridView x:Name="GridName">
<i:Interaction.Triggers>
   <i:EventTrigger EventName="SelectionChanged">
       <i:InvokeCommandAction Command="{Binding Datacontext.SelectionChangedCommand, ElementName=YourUserControlName}" CommandParameter="{Binding SelectedItems, ElementName=GridName}" />
    </i:EventTrigger>
</i:Interaction.Triggers>



public DelegateCommand<object> SelectionChangedCommand {get;set;}
SelectionChangedCommand = new DelegateCommand<object> (items => {
   var itemList = (items as ObservableCollection<object>).Cast<YourDto>().ToList();
}