如何在DataGrid中绑定两个依赖的ComboBox

1 回答

• 2

  这里有一个简单的工作示例，您可以如何使用ViewModel来满足您的需求

  XAML

  <DataGrid ItemsSource="{Binding Source}" Width="500">
          <DataGrid.Columns>
          <DataGridTemplateColumn Header="main" Width="100">
              <DataGridTemplateColumn.CellTemplate>
                  <DataTemplate>
                      <TextBlock Text="{Binding SelectedName}" />
                  </DataTemplate>
              </DataGridTemplateColumn.CellTemplate>
                  <DataGridTemplateColumn.CellEditingTemplate>
                      <DataTemplate>
                          <ComboBox SelectedValuePath="Name"                      
                                    SelectedValue="{Binding SelectedName}"                                  
                                    SelectedItem="{Binding SelectedMainItem, UpdateSourceTrigger=PropertyChanged}"                      
                                    DisplayMemberPath="Name"                      
                                    ItemsSource="{Binding SomeBinding}"/>
                      </DataTemplate>
                  </DataGridTemplateColumn.CellEditingTemplate>
              </DataGridTemplateColumn>
              <DataGridTemplateColumn Header="sub" Width="100">
                  <DataGridTemplateColumn.CellTemplate>
                      <DataTemplate>
                          <TextBlock Text="{Binding SelectedSubitem}" />
                      </DataTemplate>
                  </DataGridTemplateColumn.CellTemplate>
                  <DataGridTemplateColumn.CellEditingTemplate>
                      <DataTemplate>
                          <ComboBox SelectedValue="{Binding SelectedSubitem}"                      
                                    ItemsSource="{Binding  Path=SelectedMainItem.Subitems}" />
                      </DataTemplate>
                  </DataGridTemplateColumn.CellEditingTemplate>
              </DataGridTemplateColumn>
          </DataGrid.Columns>
      </DataGrid>
  

  代码背后

  public partial class MainWindow : Window
  {
      public MainWindow()
      {
          InitializeComponent();
          DataContext = new VMColl();
      }
  }
  
  public class VMColl
  {
      List<VM> source;
  
      public List<VM> Source
      {
          get { return source; }
          set { source = value; }
      }
  
      public VMColl()
      {
          source  = new List<VM>(){new VM(),new VM(),new VM(),new VM()};
      }
  }
  
  /// <summary>
  /// your Row
  /// </summary>
  public class VM : Notify
  {
      private List<mainObj> _items;
      public List<mainObj> SomeBinding
      {
          get { return _items; }
          set
          {
              _items = value;
              OnPropertyChanged("Items");
          }
      }
  
      private string _selectedName;
      public string SelectedName
      {
          get { return _selectedName; }
          set
          {
              _selectedName = value;
              OnPropertyChanged("SelectedName");
          }
      }
  
      private mainObj _selectedMainItem;
      public mainObj SelectedMainItem
      {
          get { return _selectedMainItem; }
          set
          {
              _selectedMainItem = value;
              OnPropertyChanged("SelectedMainItem");
              OnPropertyChanged("SelectedMainItem.Subitems");
          }
      }
  
      private string _selectedSubitem;
      public string SelectedSubitem
      {
          get { return _selectedSubitem; }
          set
          {
              _selectedSubitem = value;
              OnPropertyChanged("SelectedSubitem");
          }
      }
  
      public VM()
      {
          SomeBinding = new List<mainObj>() {new mainObj("first"),new mainObj("second"),new mainObj("someother") };
      }
  }
  
  public class mainObj : Notify
  {
      private BindingList<string> _subitems;
      public BindingList<string> Subitems
      {
          get { return _subitems; }
          set
          {
              _subitems = value;
              OnPropertyChanged("Subitems");
          }
      }
  
      private string _name;
      public string Name
      {
          get { return _name; }
          set
          {
              _name = value;
              OnPropertyChanged("Name");
          }
      }
  
      public mainObj(string name)
      {
          _name = name;
          _subitems = new BindingList<string>(){"1","2","3"};
      }
  }
  
  public class Notify : INotifyPropertyChanged
  {
      // Declare the event 
      public event PropertyChangedEventHandler PropertyChanged;
  
      // Create the OnPropertyChanged method to raise the event 
      protected void OnPropertyChanged(string name)
      {
          PropertyChangedEventHandler handler = PropertyChanged;
          if (handler != null)
          {
              handler(this, new PropertyChangedEventArgs(name));
          }
      }
  }
  

  回复于 2024-05-19T04:06:18+08:00