WPF 将组合框选择的项目绑定到列表视图当前项目

Question

我是 WPF 的新手，所以我一定遗漏了一些非常明显的东西。

我有这个简单的设置：

 public partial class MainWindow : Window
{
    public ObservableCollection<Student> Students { get; set; }
    public ObservableCollection<Student> ClassroomStudents { get; set; }

    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;

        Students = new ObservableCollection<Student>();

        Students.Add(new Student { ID = 1, Name = "John" });
        Students.Add(new Student { ID = 2, Name = "Paul" });
        Students.Add(new Student { ID = 3, Name = "Ringo"});
        Students.Add(new Student { ID = 4, Name = "George" });

        ClassroomStudents = new ObservableCollection<Student>();
        ClassroomStudents.Add(Students[0]); //View binds it ok at startup (one way)
        ClassroomStudents.Add(Students[1]); //View binds ut ok at startup (one way)

    }


    public class Student : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int ID { get; set; }
        public string Name { get; set; }
    }

    private void bOK_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show(ClassroomStudents[0].Name);

}

我想要实现的是显示 ClassroomStudents 集合并在应绑定到集合项目的每个项目上添加一个组合框。

    <Grid>
    <ListView x:Name="SortBy" ItemsSource="{Binding ClassroomStudents}" Grid.Column="0">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Name" Width="80">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>                             
                            <ComboBox                                    
                                ItemsSource="{Binding Students, RelativeSource={ RelativeSource AncestorType=Window}}" 
                                DisplayMemberPath="Name"                                         
                                SelectedItem="{Binding Path=.,Mode=TwoWay}"                                                                        
                                >
                            </ComboBox>
                            <!--<Label Content="{Binding}"></Label>-->
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>                   
            </GridView>
        </ListView.View>
    </ListView>

    <!--OK/CANCEL BUTTONS-->
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Grid.Row="1" Margin="0,10,0,0">
        <Button x:Name="bOK" IsDefault="True" Margin="10" Width="100" Click="bOK_Click">OK</Button>
        <Button x:Name="bCancel" IsCancel="True" Margin="10" Grid.Column="1" Width="100" Click="bCancel_Click">Cancel</Button>
    </StackPanel>
</Grid>

它以一种方式绑定得很好：

image

但是，如果我 select 另一个学生在组合框中，模型上的集合值不会改变：

MessageBox.Show(ClassroomStudents[0].Name); //Always return John

我找到了一些建议绑定到属性（即 ID）的答案，但我想绑定到集合项（学生）。

谢谢，罗多.

Answer 1

我能想到的最简单的解决方法是将您的 ClassroomStudents 项目包装在一个选择容器中：

public class StudentContainer : INotifyPropertyChanged
{
    public Student Item { get; set; } // TODO: INotifyPropertyChanged implementation
}

更改集合和初始化：

public ObservableCollection<StudentContainer> ClassroomStudents { get; set; }
// ...
ClassroomStudents.Add(new StudentContainer { Item = Students[0] });

更改XAML

<ComboBox                                    
    ItemsSource="{Binding Students, RelativeSource={ RelativeSource AncestorType=Window}}"
    DisplayMemberPath="Name"
    SelectedItem="{Binding Path=Item,Mode=TwoWay}"
    >

我希望这足以给你一个起点。您的代码中有一些与您的问题没有直接关系的附带问题，但可能需要注意才能使整个过程正常运行。

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