如何将 ListBoxItem.IsSelected 绑定到布尔数据属性

问题描述

我在扩展选择模式中有一个 WPF 列表框.

I have a WPF ListBox in Extended SelectionMode.

我需要做的是将 ListBox 绑定到数据项类的可观察集合，这很容易，但本质上，将每个 ListBoxItem 的 IsSelected 状态绑定到相应的布尔属性数据项.

What I need to do is bind the ListBox to an observable collection of a data item class, which is easy, but essentially, bind the IsSelected status of each ListBoxItem to a boolean property in the respective data item.

而且，我需要它是双向的，以便我可以使用 ViewModel 中的选定和未选定项目填充 ListBox.

And, I need it to be two-way, so that I can populate the ListBox with selected and unselected items from the ViewModel.

我查看了许多实现，但没有一个对我有用.它们包括:

I've looked at a number of implementations but none work for me. They include:

• 向 ListBoxItem 的样式添加 DataTrigger 并调用状态操作更改

我意识到这可以使用事件处理程序在代码隐藏中完成，但考虑到域的复杂性，它会非常混乱.我宁愿坚持使用 ViewModel 进行双向绑定.

I realise this can be done in code-behind with an event handler, but given the complexity of the domain it would be horribly messy. I'd rather stick to two-way Binding with the ViewModel.

谢谢.标记

推荐答案

在 WPF 中，您可以轻松地将 ListBox 绑定到具有 IsSelected 状态的布尔属性的项目集合.如果您的问题是关于 Silverlight，恐怕它不会以简单的方式工作.

In WPF you can easily bind your ListBox to a collection of items with a boolean property for the IsSelected state. If your question is about Silverlight, i'm afraid it won't work the easy way.

public class Item : INotifyPropertyChanged
{
    // INotifyPropertyChanged stuff not shown here for brevity
    public string ItemText { get; set; }
    public bool IsItemSelected { get; set; }
}

public class ViewModel : INotifyPropertyChanged
{
    public ViewModel()
    {
        Items = new ObservableCollection<Item>();
    }

    // INotifyPropertyChanged stuff not shown here for brevity
    public ObservableCollection<Item> Items { get; set; }
}

<ListBox ItemsSource="{Binding Items, Source={StaticResource ViewModel}}"
         SelectionMode="Extended">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="IsSelected" Value="{Binding IsItemSelected}"/>
        </Style>
    </ListBox.ItemContainerStyle>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding ItemText}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

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