(WPF, Data Binding, DependencyProperty) 能否只获取列表中特定成员变量的列表?

(WPF, Data Binding, DependencyProperty) Can I get only the list of specific member variables in the list?

首先,这个问题的主要目的是为了方便其他组员在viewmodel中使用我的代码。这是一个良好的合作代码设计问题。所以用到了DependencyProperty,也用到了Data Binding。

我想做的是,如果用户在my DependencyProperty列表中添加一个值,那么整个UI对应的内容会自动应用数据绑定。在示例中,它将是一个 ComboBox。在 ItemsSource 属性 中显示一个列表,并使用 SelectedItem 属性.

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所以我写了如下代码。但是,在用户定义类型MyData的列表中,我卡在了特定成员(MyData中的Data1、Data2、Data3 class)列表到ComboBox控件的数据绑定中。

从一开始,代码设计可能就错了。请教。代码如下。

public partial class MainWindow : Window
{
    public class MyData
    {
        public MyData(int data1, int data2, int data3)
        {
            Data1 = data1;
            Data2 = data2;
            Data3 = data3;
        }
        public int Data1 { get; set; }
        public int Data2 { get; set; }
        public int Data3 { get; set; }
    }

    public List<MyData> MyDataList
    {
        get => (List<MyData>)GetValue(MyDataListProperty);
        set => SetValue(MyDataListProperty, value);
    }
    public static readonly DependencyProperty MyDataListProperty = DependencyProperty.Register(
        "MyDataList", typeof(List<MyData>), typeof(MainWindow), new UIPropertyMetadata(new List<MyData>()));

    public MyData CurrentMyData
    {
        get => (MyData)GetValue(CurrentMyDataProperty);
        set => SetValue(CurrentMyDataProperty, value);
    }
    public static readonly DependencyProperty CurrentMyDataProperty = DependencyProperty.Register(
        "CurrentMyData", typeof(MyData), typeof(MainWindow), new UIPropertyMetadata(null));

    public MainWindow()
    {
        InitializeComponent();

        DataContext = this;

        MyDataList.Add(new MyData(1, 2, 3));
        MyDataList.Add(new MyData(4, 5, 6));
        MyDataList.Add(new MyData(7, 8, 9));
        CurrentMyData = MyDataList[1];
    }
}
<TextBox  Width="120" Height="23" Margin="76,160,596,236"
    Text="{Binding CurrentMyData.Data2, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>

<ComboBox  Width="189" Height="34" Margin="291,160,312,225"
    ItemsSource="{Binding <!-- list for Data3 -->, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
    SelectedItem="{Binding <!-- and selected item. CurrentMyData.Data3 ? -->, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>

ItemsSource 可以包含复杂的对象。如果 ComboBox 应仅显示一个 属性,请设置 DisplayMemberPath:

<ComboBox 
    ItemsSource="{Binding MyDataList}"
    SelectedItem="{Binding CurrentMyData}"
    DisplayMemberPath="Data3"/>

显示许多属性更改 ItemTemplate:

<ComboBox 
    ItemsSource="{Binding MyDataList}"
    SelectedItem="{Binding CurrentMyData}">
    <ComboBox.ItemTemplate>        
        <DataTemplate>            
            <StackPanel>                
                <TextBlock Text="{Binding Data1}"/>
                <TextBlock Text="{Binding Data2}"/>
                <TextBlock Text="{Binding Data3}"/>                
            <StackPanel>            
        </DataTemplate>        
    </ComboBox.ItemTemplate>    
</ComboBox>