WPF는 DataGrid 콤보 상자 선택한 항목을 선택한 DataGridRow의 데이터 컨텍스트에 바인딩합니다.

다음은 선택한 국가를 WorldData뷰 모델에 다시 저장하는 전체 테스트 앱입니다 . 포함하지 않는 UpdateSourceTrigger에서이 SelectedItem작동하지 않습니다.

<Window
    x:Class="ComboboxInDataGrid.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"
    Title="MainWindow"
    Width="525"
    Height="350"
    mc:Ignorable="d">
    <Grid>
        <DataGrid x:Name="me"
            HorizontalAlignment="Left"
            AutoGenerateColumns="False"
            CanUserAddRows="False"
            ItemsSource="{Binding Path=WorldDataList}"
            SelectedItem="{Binding SelectedWorldData}">
            <DataGrid.Columns>
                <DataGridTemplateColumn Header="Country">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid>
                                <ComboBox ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, 
                                                                                               AncestorType={x:Type DataGrid}},
                                                                Path=DataContext.Countries}"
                                          SelectedItem="{Binding Path=Country, 
                                                                 Mode=TwoWay,
                                                                 UpdateSourceTrigger=PropertyChanged}" />
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>


using System.Collections.Generic;
using System.Windows;

namespace ComboboxInDataGrid
{
    public partial class MainWindow : Window
    {
        public MainWindow ()
        {
            DataContext = new WorldDataViewModel ();
            InitializeComponent ();
        }
    }

    class WorldDataViewModel
    {
        public WorldDataViewModel ()
        {
            var c1 = "USA";
            var c2 = "Canada";
            var c3 = "Brasil";
            var c4 = "Brasfsdfsil";

            Countries = new List<string> ();
            Countries.Add (c1);
            Countries.Add (c2);
            Countries.Add (c3);
            Countries.Add (c4);

            _worldDataList.Add (new WorldData { Index = 1, Country = c2 });
            _worldDataList.Add (new WorldData { Index = 2, Country = c3 });
            _worldDataList.Add (new WorldData { Index = 3, Country = c4 });
        }

        private List<WorldData> _worldDataList = new List<WorldData> ();
        public List<WorldData> WorldDataList
        {
            get
            {
                return _worldDataList;
            }
            set
            {
                _worldDataList = value;

            }
        }

        public List<string> Countries { get; set; }

        private WorldData worldData;
        public WorldData SelectedWorldData
        {
            get
            {
                return worldData;
            }

            set
            {
                worldData = value;
            }
        }
    }

    public class WorldData
    {
        public int Index { get; set; }

        private string country;
        public string Country
        {
            get { return country; }
            set
            {
                country = value;
            }
        }
    }
}