尝试在WPF中设置子DataGrid的itemsource时，获取类似“Items collection必须为空，然后才能使用ItemsSource . ”重复]

2 回答

• 2

  我想你可以尝试一下

  <DataGrid Grid.Row ="1" x:Name="Grid1" ItemsSource="{Binding Path=md,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" AutoGenerateColumns="False">
              <DataGrid.Columns>
                  <DataGridTextColumn Header="Categogy" Width="100"  Binding="{Binding Path =CateName,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
                  <DataGridTemplateColumn Header="Characterictics" Width="600">
                      <DataGridTemplateColumn.CellTemplate>
                          <DataTemplate>
                              <DataGrid   AutoGenerateColumns="False" Height="100" ItemsSource="{Binding list}">
                                  <DataGrid.Columns>
                                      <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
                                  </DataGrid.Columns>
                              </DataGrid>
                          </DataTemplate>
                      </DataGridTemplateColumn.CellTemplate>
                  </DataGridTemplateColumn>
              </DataGrid.Columns>
          </DataGrid>
  

  编辑：如果您更喜欢使用窗口的datacontext中的列表，请将嵌套的datarid更改为

  <DataGrid   AutoGenerateColumns="False" Height="100" ItemsSource="{Binding list,RelativeSource={RelativeSource AncestorType=Window}}">
                                  <DataGrid.Columns>
                                      <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
                                  </DataGrid.Columns>
                              </DataGrid>
  

  视图模型：

  public partial class MainWindow : Window
      {
          private ObservableCollection<Model> _md = new ObservableCollection<Model>();
          public ObservableCollection<Model> md
          {
              get { return _md; }
              set { _md = value; }
          }
  
          private ObservableCollection<Characteristics> _list;
          public ObservableCollection<Characteristics> list
          {
              get { return _list; }
              set { _list = value; }
          }
          public MainWindow()
          {
              InitializeComponent();
  
              this.DataContext = this;
  
              Model m = new Model();
              m.CateName = "CategoryName";
              m.list.Add(new Characteristics() { Name = "test Name", Value = "00" });
              m.list.Add(new Characteristics() { Name = "TEst name1", Value = "00" });
              m.list.Add(new Characteristics() { Name = "XX", Value = "00" });
              md.Add(m);
  
              Model m1 = new Model();
              m1.CateName = "CategoryName1";
              m1.list.Add(new Characteristics() { Name = "XX", Value = "00" });
              m1.list.Add(new Characteristics() { Name = "XX", Value = "00" });
              m1.list.Add(new Characteristics() { Name = "XX", Value = "00" });
              md.Add(m1);
  
              list = new ObservableCollection<Characteristics>();
              list.Add(new Characteristics() { Name = "vali", Value = "00" });
              list.Add(new Characteristics() { Name = "XX", Value = "00" });
  
          }      
      }
  
      public class Model
      {
          private string cateName;
          public string CateName
          {
              get { return cateName; }
              set { cateName = value; }
          }
  
          private List<Characteristics> _list = new List<Characteristics>();
  
          public List<Characteristics> list
          {
              get { return _list; }
              set { _list = value; }
          }
      }
  
      public class Characteristics
      {
          private string name;
          public string Name
          {
              get { return name; }
              set { name = value; }
          }
  
          private string value;
  
          public string Value
          {
              get { return this.value; }
              set { this.value = value; }
          }
      }
  

  回复于 2024-05-13T21:49:55+08:00
• 0

  对于嵌套的DataGrid，将 DataGridTextColumn 放入 <DataGrid.Columns> 标记中

  <DataGrid ItemsSource="{Binding list}">
    <DataGrid.Columns>
      <DataGridTextColumn Binding="{Binding Name}" />
    </DataGrid.Columns>
  </DataGrid>
  

  否则DataGridTextColumn被解释为Item并导致itemsSource错误

  并且还修复了绑定，它们不需要使用父DataContext

  回复于 2024-05-13T21:49:55+08:00