如何在C# WPF中通过IsSelected属性程序化预选中ListView项？

问题场景 #

开发C# WPF应用时，ListView功能正常，需要实现列表项的预选中（选中状态对用户可见且支持用户修改）。最初尝试让Person类继承ListViewItem来设置IsSelected，虽然能看到选中行，但行内容为空，需要正确的实现方式。

原XAML代码：

<Grid>
    <ListView Name="lvEntries" SelectionMode="Multiple" Margin="0,0,0,116">
        <ListView.View>
            <GridView>
                <GridViewColumn Width="100" Header="Lastname" DisplayMemberBinding="{Binding LastName}"/>
                <GridViewColumn Width="100" Header="Firstname" DisplayMemberBinding="{Binding FirstName}"/>
            </GridView>
        </ListView.View>
    </ListView>
</Grid>

原Person类：

public class Person
{
    public string LastName { get; set; }
    public string FirstName { get; set; }
}

解决方案一：直接操作ListView的SelectedItems集合 #

不需要修改Person类，在后台代码添加完数据后，直接将需要预选中的项加入SelectedItems集合即可：

修改后的后台代码：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        lvEntries.Items.Clear();
        
        Person newPerson = new Person();
        newPerson.FirstName = "Jack";
        newPerson.LastName = "Nicholson";
        lvEntries.Items.Add(newPerson);
        
        Person newPerson2 = new Person();
        newPerson2.FirstName = "Bill";
        newPerson2.LastName = "Murray";
        lvEntries.Items.Add(newPerson2);
        
        // 预选中指定项
        lvEntries.SelectedItems.Add(newPerson);
        lvEntries.SelectedItems.Add(newPerson2);
    }
}

注意：如果是单选模式（SelectionMode="Single"），直接设置lvEntries.SelectedItem = newPerson;即可。

解决方案二：数据绑定选中状态（推荐，符合WPF设计思想） #

这种方式将选中状态与数据模型绑定，适配复杂场景和MVVM模式，同时支持双向联动（用户修改选中状态时，数据模型的属性会同步更新）：

1. 修改Person类，添加IsSelected属性并实现INotifyPropertyChanged接口：

public class Person : INotifyPropertyChanged
{
    private string _lastName;
    public string LastName
    {
        get => _lastName;
        set
        {
            _lastName = value;
            OnPropertyChanged(nameof(LastName));
        }
    }

    private string _firstName;
    public string FirstName
    {
        get => _firstName;
        set
        {
            _firstName = value;
            OnPropertyChanged(nameof(FirstName));
        }
    }

    private bool _isSelected;
    public bool IsSelected
    {
        get => _isSelected;
        set
        {
            _isSelected = value;
            OnPropertyChanged(nameof(IsSelected));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

2. 修改XAML，为ListView的ItemContainerStyle绑定IsSelected属性：

<Grid>
    <ListView Name="lvEntries" SelectionMode="Multiple" Margin="0,0,0,116">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/>
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.View>
            <GridView>
                <GridViewColumn Width="100" Header="Lastname" DisplayMemberBinding="{Binding LastName}"/>
                <GridViewColumn Width="100" Header="Firstname" DisplayMemberBinding="{Binding FirstName}"/>
            </GridView>
        </ListView.View>
    </ListView>
</Grid>

3. 后台代码中直接设置Person的IsSelected属性：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        lvEntries.Items.Clear();
        
        Person newPerson = new Person();
        newPerson.FirstName = "Jack";
        newPerson.LastName = "Nicholson";
        newPerson.IsSelected = true; // 标记为预选中
        lvEntries.Items.Add(newPerson);
        
        Person newPerson2 = new Person();
        newPerson2.FirstName = "Bill";
        newPerson2.LastName = "Murray";
        newPerson2.IsSelected = true; // 标记为预选中
        lvEntries.Items.Add(newPerson2);
    }
}

内容的提问来源于stack exchange，提问作者Emil