Question

我已经定义了以下XAML。绑定填充了DataGridComboBoxColumn，如果我同时在组合框中选择PartNumber，则需要在DataGridTextColumn中绑定另一个属性（PartName）值。我怎么能在DataGridTextColumn中进行绑定？

<Window.Resources>
  <ObjectDataProvider x:Key="RecordValues"
                      ObjectType="{x:Type local:RecordTemp}"
                      MethodName="GetPersonList">
  </ObjectDataProvider>
</Window.Resources>
<Grid>
  <Grid>
    <DataGrid AutoGenerateColumns="False"
              ItemsSource="{Binding}"
              Margin="10"
              Name="dataGrid1">
      <DataGrid.Columns>
        <DataGridComboBoxColumn Header="Combo"
                                Width="300"
                                SelectedItemBinding="{Binding Values}"
                                DisplayMemberPath="PartNumber"
                                ItemsSource="{Binding Source={StaticResource RecordValues}}" />
        <DataGridTextColumn Header="Order Name"
                            Binding="" />
      </DataGrid.Columns>
    </DataGrid>
  </Grid>
</Grid>

在C＃中定义下面的代码，

    ObservableCollection<RecordTemp> RecordsTemp = new ObservableCollection<RecordTemp>();

    RecordsTemp.Add(new RecordTemp());
    RecordsTemp.Add(new RecordTemp());
    dataGrid1.DataContext = RecordsTemp;  


   public class RecordTemp
    {
    List<PartsList> _value = new List<PartsList>();

       public RecordTemp()
    {
        _value.Add(new PartsList() { PartName = "One", PartNumber = "1", PartQuantity = 20 });
        _value.Add(new PartsList() { PartName = "Two", PartNumber = "2", PartQuantity = 10 });
    }

    public List<PartsList> value
    {
        get { return _value; }
        set { _value = value; }
    }

    public List<PartsList> GetPersonList()
    {
        return _value;
    }
    }

public class PartsList
    {
        public string PartName { get; set; }
        public double PartQuantity { get; set; }
        public string PartNumber { get; set; }
    }

Answer 1

实现这一目标的一种方法是

在RecordTemp类中添加一个新属性（比如属性名称为SelectedPart），该类将存储选定的PartList对象。
将SelectedPart属性绑定到ComboBox的SelectedValue属性。
将SelectedPart绑定到文本框。
现在，RecordTemp类应该实现INotifyPropertyChanged接口，以便在用户更改ComboBox值时更新UI。

以下是我对您的代码所做的修改。

<DataGrid AutoGenerateColumns="False"
          ItemsSource="{Binding}"
          Margin="10"
          Name="dataGrid1"
          CanUserAddRows="False">
  <DataGrid.Columns>
    <DataGridTemplateColumn Header="Combo">
      <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
          <ComboBox SelectedValue="{Binding SelectedPart, UpdateSourceTrigger=PropertyChanged}"
                    DisplayMemberPath="PartNumber"
                    ItemsSource="{Binding Source={StaticResource RecordValues}}" />
        </DataTemplate>
      </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
    <DataGridTextColumn Header="Order Name"
                        Binding="{Binding SelectedPart.PartName}" />
  </DataGrid.Columns>
</DataGrid>

代码隐藏文件。您可能需要更改命名空间。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            ObservableCollection<RecordTemp> RecordsTemp = new ObservableCollection<RecordTemp>();

            RecordsTemp.Add(new RecordTemp());
            RecordsTemp.Add(new RecordTemp());
            dataGrid1.DataContext = RecordsTemp;
        }
    }

    public class RecordTemp : INotifyPropertyChanged
    {
        List<PartsList> _value = new List<PartsList>();

        public RecordTemp()
        {
            _value.Add(new PartsList() { PartName = "One", PartNumber = "1", PartQuantity = 20 });
            _value.Add(new PartsList() { PartName = "Two", PartNumber = "2", PartQuantity = 10 });
        }

        public List<PartsList> value
        {
            get { return _value; }
            set { _value = value; }
        }

        private PartsList _SelectedPart;

        public PartsList SelectedPart
        {
            get { return _SelectedPart; }
            set
            {
                _SelectedPart = value;
                OnPropertyChanged("SelectedPart");
            }
        }

        public List<PartsList> GetPersonList()
        {
            return _value;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

    public class PartsList
    {
        public string PartName { get; set; }
        public double PartQuantity { get; set; }
        public string PartNumber { get; set; }
    }
}

如何在Datagrid中定义依赖项绑定

1 个答案: