wpf - DisplayMemberPath 在 WPF 中不起作用

Question

我只想使用 ItemsSource DisplayMemberPath 属性将 CustomerList\CustomerName 属性项显示到 ListBox。但它不起作用。我不想在我的问题中使用 DataContext 或任何其他绑定(bind)。请帮忙。我的代码如下:

MainWindow.xaml.cs

namespace BindingAnItemControlToAList
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class Customer
    {
        public string Name {get;set;}
        public string LastName { get; set; }
    }
    public class CustomerList 
    { 
        public List<Customer> Customers { get; set; }
        public List<string> CustomerName { get; set; }
        public List<string> CustomerLastName { get; set; }
        public CustomerList() 
        { 
            Customers = new List<Customer>();
            CustomerName = new List<string>();
            CustomerLastName = new List<string>();
            CustomerName.Add("Name1");
            CustomerLastName.Add("LastName1");
            CustomerName.Add("Name2");
            CustomerLastName.Add("LastName2");

            Customers.Add(new Customer() { Name = CustomerName[0], LastName = CustomerLastName[0] });
            Customers.Add(new Customer() { Name = CustomerName[1], LastName = CustomerLastName[1] });
        } 
    } 
}

**MainWindow.Xaml**
<Window x:Class="BindingAnItemControlToAList.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:BindingAnItemControlToAList"
        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded" >
    <Window.Resources>
        <local:CustomerList x:Key="Cust"/>
    </Window.Resources>
    <Grid Name="Grid1">
        <ListBox ItemsSource="{Binding Source={StaticResource Cust}}"  DisplayMemberPath="CustomerName" Height="172" HorizontalAlignment="Left" Margin="27,23,0,0" Name="lstStates" VerticalAlignment="Top" Width="245" />
           </Grid>
</Window>

Answer 1

您没有将“集合”设置为 ItemsSource...因此您没有任何选择。这将选择列表 CustomerName。

<ListBox ItemsSource="{Binding Source={StaticResource Cust}, Path=CustomerName}" 
    Height="172" HorizontalAlignment="Left" Margin="27,23,0,0" Name="lstStates" 
    VerticalAlignment="Top" Width="245" />

但实际上，您应该重构您的 CustomerList 类...不需要单独的列表来复制 Name 和 LastName 字段Customer - 这意味着您在不必要地复制数据，而且数据有可能与每个集合不同步。

您还应该考虑使用 INotifyPropertyChanged，并在您的类上使用 INotifyCollectionChanged(例如，使用 ObservableCollection 而不是 List，并在类上实现 INotifyPropertyChanged Customer 类)如果可以更改集合或数据。

例如

public class CustomerList
{
    public ObservableCollection<Customer> Customers { get; set; }
    public CustomerList()
    {
        Customers = new ObservableCollection<Customer>();
        Customers.Add(new Customer { Name = "Name1", LastName = "LastName1" });
        Customers.Add(new Customer { Name = "Name2", LastName = "LastName2" });
    }
}

<ListBox ItemsSource="{Binding Source={StaticResource Cust}, Path=Customers}" DisplayMemberPath="Name" Height="172" HorizontalAlignment="Left" Margin="27,23,0,0" Name="lstStates" VerticalAlignment="Top" Width="245" />