通过数据绑定动态地将DataGrid列设置为ComboBox列

2 回答

• 1

  由于 DataColumn 未实现INotifyPropertyChanged接口并将属性更改通知引发到WPF，因此无法使用 .

  但是，如果您向 DataTable 添加一列并绑定到此列，它将起作用：

  ViewModel.GridCollection.Columns.Add(new DataColumn("Caption"));
  

  区别在于 DataRowView 类实现了 INotifyPropertyChanged 接口 . 这是WPF能够侦听源属性的更改并动态更新视图所必需的 .

  回复于 2024-04-28T19:30:04+08:00
• 0

  如果更改布局，则需要重置绑定 . 从datagrid中删除绑定/数据源 . 更改 Headers 值并将源再次绑定到您的数据网格 .

  这里代码对我有用：

  窗口的XAML

  Window x:Class="WpfApplication7.MainWindow"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:local="clr-namespace:WpfApplication7"
      mc:Ignorable="d"
      Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
  <Grid>
      <Grid.RowDefinitions>
          <RowDefinition />
          <RowDefinition />
      </Grid.RowDefinitions>
      <DataGrid Name="grd" AutoGenerateColumns="False" ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, Path=DataContext}">
          <DataGrid.Columns>
              <DataGridTextColumn Header="01" Binding="{Binding Name}" />
              <DataGridTextColumn Header="02" Binding="{Binding LastName}" />
              <DataGridTemplateColumn Header="CBX">
                  <DataGridTemplateColumn.CellTemplate>
                      <DataTemplate>
                          <ComboBox>
                              <ComboBox.Style>
                                  <Style TargetType="ComboBox">
                                      <Style.Triggers>
                                          <DataTrigger Binding="{Binding Path=Caption, Mode=TwoWay}" Value="ShowCombobox">
                                              <Setter Property="Visibility" Value="Collapsed" />
                                          </DataTrigger>
                                      </Style.Triggers>
                                  </Style>
                              </ComboBox.Style>
                          </ComboBox>
                      </DataTemplate>
                  </DataGridTemplateColumn.CellTemplate>
              </DataGridTemplateColumn>
          </DataGrid.Columns>
      </DataGrid>
      <Button Content="Click" Click="Button_Click" Grid.Row="1"/>
  </Grid>
  </Window>
  

  背后的代码：

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Data;
  using System.Windows.Documents;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Windows.Media.Imaging;
  using System.Windows.Navigation;
  using System.Windows.Shapes;
  
  namespace WpfApplication7
  {
  /// <summary>
  /// Interaktionslogik für MainWindow.xaml
  /// </summary>
  public partial class MainWindow : Window
  {
      public MainWindow()
      {
          InitializeComponent();
      }
  
      private void Window_Loaded(object sender, RoutedEventArgs e)
      {
  
          items soureitems = new items();
  
          for(int i = 0; i <= 10; i++)
          {
              item sourceitem = new item();
              sourceitem.Name = "John";
              sourceitem.LastName = "Doe";
              sourceitem.Caption = "";
              soureitems.Add(sourceitem);
          }
  
          this.DataContext = soureitems;
      }
  
      private void Button_Click(object sender, RoutedEventArgs e)
      {
  
          items sourceitems = (items)(this.DataContext);
          this.DataContext = null;
          foreach (item sourceitem in sourceitems)
          {
              if(sourceitem.Caption != "ShowCombobox")
              {
                  sourceitem.Caption = "ShowCombobox";
              } else
              {
                  sourceitem.Caption = "";
              }
          }
          this.DataContext = sourceitems;
      }
  }
  
  public class items : System.Collections.ObjectModel.ObservableCollection<item> { }
  
  public class item
  {
      string _Name;
      string _LastName;
      string _Caption;
      public string Name {
          get { return _Name; }
          set { _Name = value; }
      }
      public string LastName
      {
          get { return _LastName; }
          set { _LastName = value; }
      }
      public string Caption
      {
          get { return _Caption; }
          set { _Caption = value; }
      }
  }
  }
  

  回复于 2024-04-28T19:30:04+08:00