WPF：将List <class>绑定到ComboBox

3 回答

• 1

  DisplayMemberPath 应包含集合中元素的属性名称 . 假设 SearchPointCollection 中的元素属于 SearchPoint 类型，并且此类具有属性 SearchPointName ，则应设置 DisplayMemberPath ，如下所示：

  SearchRefPoint.DisplayMemberPath = "SearchPointName";
  

  Edit:

  在您的代码中，类 coSearchPoint 具有在构造函数中定义的Field Name . Name 必须是类的属性，否则Binding无法工作 .

  回复于 2024-05-04T11:46:18+08:00
• 1

  这是一个使用MVVM模式的简单示例

  XAML

  <Window x:Class="Binding_a_List_to_a_ComboBox.MainWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          Title="MainWindow" Height="350" Width="525">
  <Grid HorizontalAlignment="Left"
        VerticalAlignment="Top">
      <Grid.ColumnDefinitions>
          <ColumnDefinition Width="150"/>
          <ColumnDefinition Width="Auto"/>
      </Grid.ColumnDefinitions>
      <Grid.RowDefinitions>
          <RowDefinition Height="50"/>
          <RowDefinition Height="25"/>
      </Grid.RowDefinitions>
  
      <ComboBox Grid.Column="0" Grid.Row="0" ItemsSource="{Binding SearchPointCollection , UpdateSourceTrigger=PropertyChanged}"
                SelectedIndex="{Binding MySelectedIndex, UpdateSourceTrigger=PropertyChanged}"
                SelectedItem="{Binding MySelectedItem, UpdateSourceTrigger=PropertyChanged}">
          <ComboBox.ItemTemplate>
              <DataTemplate>
                  <Grid>
                      <Grid.RowDefinitions>
                          <RowDefinition/>
                          <RowDefinition/>
                          <RowDefinition/>
                      </Grid.RowDefinitions>
                      <TextBlock Text="{Binding Id}" Grid.Row="0"/>
                      <TextBlock Text="{Binding Name}" Grid.Row="1"/>
                      <TextBlock Text="{Binding Otherstuff}" Grid.Row="2"/>
                  </Grid>
              </DataTemplate>
          </ComboBox.ItemTemplate>
      </ComboBox>
      <Button Content="Bind NOW" Grid.Column="0" Grid.Row="1" Click="Button_Click"/>
      <TextBlock Text="{Binding MySelectedIndex, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="0"/>
  
      <Grid  Grid.Column="1" Grid.Row="1"
             DataContext="{Binding MySelectedItem, UpdateSourceTrigger=PropertyChanged}">
          <Grid.ColumnDefinitions>
              <ColumnDefinition/>
              <ColumnDefinition/>
              <ColumnDefinition/>
          </Grid.ColumnDefinitions>
  
          <TextBlock Text="{Binding Id}" Grid.Column="0"/>
          <TextBlock Text="{Binding Name}" Grid.Column="1"/>
          <TextBlock Text="{Binding SomeValue}" Grid.Column="2"/>
      </Grid>
  </Grid>
  

  代码

  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Windows;
  using Import_Rates_Manager;
  
  namespace Binding_a_List_to_a_ComboBox
  {
      /// <summary>
      /// Interaktionslogik für MainWindow.xaml
      /// </summary>
      public partial class MainWindow : Window
      {
          public MainWindow()
          {
              InitializeComponent();
          }
  
          private void Button_Click(object sender, RoutedEventArgs e)
          {
              DataContext = new coImportReader();
          }    
      }
  }
  namespace Import_Rates_Manager
  {
      public class coImportReader : INotifyPropertyChanged
      {
          private List<coSearchPoint> myItemsSource;
          private int mySelectedIndex;
          private coSearchPoint mySelectedItem;
  
          public List<coSearchPoint> SearchPointCollection 
          {
              get { return myItemsSource; }
              set
              {
                  myItemsSource = value;
                  OnPropertyChanged("SearchPointCollection ");
              }
          }
  
          public int MySelectedIndex
          {
              get { return mySelectedIndex; }
              set
              {
                  mySelectedIndex = value;
                  OnPropertyChanged("MySelectedIndex");
              }
          }
  
          public coSearchPoint MySelectedItem
          {
              get { return mySelectedItem; }
              set { mySelectedItem = value;
              OnPropertyChanged("MySelectedItem");
              }
          }
  
          #region cTor
  
          public coImportReader()
          {
              myItemsSource = new List<coSearchPoint>();
              myItemsSource.Add(new coSearchPoint { Name = "Name1" });
              myItemsSource.Add(new coSearchPoint { Name = "Name2" });
              myItemsSource.Add(new coSearchPoint { Name = "Name3" });
              myItemsSource.Add(new coSearchPoint { Name = "Name4" });
              myItemsSource.Add(new coSearchPoint { Name = "Name5" });
          }
          #endregion
  
          #region INotifyPropertyChanged Member
  
          public event PropertyChangedEventHandler PropertyChanged;
          protected virtual void OnPropertyChanged(string propertyName)
          {
              PropertyChangedEventHandler handler = PropertyChanged;
              if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
          }
  
          #endregion
      }
  
      public class coSearchPoint
      {
          public Guid Id { get; set; }
          public String Name { get; set; }
          public IRange FoundCell { get; set; }    
  
          public coSearchPoint()
          {
              Name = "";
              Id = Guid.NewGuid();
              FoundCell = null;    
          }
      }
  
      public interface IRange
      {
          string SomeValue { get; }
      }
  }
  

  这是3个类：

  • MainWindow 将VM设置为其Datacontext

  • coImportReader 提供绑定属性的类

  • coSearchPoint 这只是一个容器，供您参考

  • IRange 这只是一个界面

  回复于 2024-05-04T11:46:18+08:00
• 0

  你绑定的集合需要是一个属性而不是一个字段 .

  也试试这个：

  public coImportReader ir { get; set; } 
  public <type of SearchPointCollection> irCollection { get { return ir != null ? ir.SearchPointCollection : null; } }
  

  绑定到irCollection并查看您获得的错误（如果有） .

  回复于 2024-05-04T11:46:18+08:00