<Window x:Class="DataGridPractice.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:DataGridPractice"

        mc:Ignorable="d"

        Title="MainWindow" Height="450" Width="800" Loaded="Window_Loaded">

    <Grid>

        <Grid.Resources>

            <DataTemplate x:Key="DateTemplate" >

                <StackPanel DataContext="{Binding choseItems}">

                    <Border Background="LightBlue">

                        <TextBox Text="{Binding ChoseName}" Cursor="Arrow" Name="R0"/>

                    </Border>

                    <Border Background="White">

                        <TextBox Text="{Binding ChoseContent}" Cursor="Arrow" Name="R1"/>

                    </Border>

                </StackPanel>

            </DataTemplate>

            <DataTemplate x:Key="EditingDateTemplate">

            </DataTemplate>

        </Grid.Resources>

        <DataGrid AutoGenerateColumns="False" Name="datagrid1">

            <DataGrid.Columns>

                <DataGridTextColumn Header="ID值"  Width="auto" Binding="{Binding questionID}" />

                <DataGridTextColumn Header="题目"  Width="auto" Binding="{Binding questionName}" />

                <DataGridTemplateColumn Header="多行" Width="*" MinWidth="25"

                                        CellTemplate="{StaticResource DateTemplate}" CellEditingTemplate="{StaticResource EditingDateTemplate}" IsReadOnly="True"/>

            </DataGrid.Columns>

        </DataGrid>

    </Grid>

</Window>

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Controls.Primitives;

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.Windows.Threading;

namespace DataGridPractice

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        class question

        {

            //题目ID号

            public Int32 questionID { get; set; }

            //题目名,比如:第1题或第2题等

            public string questionName { get; set; }

            //某题中"选项类"的集合,比如A-D

            public ObservableCollection<choseItem> choseItems { get; set; }

            public question(Int32 _id, string _questionname, ObservableCollection <choseItem> _choseitems)//构造函数

            {

                questionID = _id;

                questionName = _questionname;

                choseItems = _choseitems;

            }

        }

        //选项类

        class choseItem

        {

                //选项名,比如:A,B,C,D之类

                public string ChoseName { get; set; }

                //选项内容

                public string ChoseContent { get; set; }

        }

        ObservableCollection <question> Questions = new ObservableCollection <question>();//题目数组

        ObservableCollection<choseItem> ChoseItems = new ObservableCollection<choseItem>();//选项数组

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            string[] CharStr = new string[4] { "A", "B", "C", "D" };

            for (int i = 0; i < 5; i++)

            {

                for (int j = 0; j < 4; j++)

                {

                    choseItem item = new choseItem();//选项类

                    item.ChoseName = CharStr[j] + ":";

                    item.ChoseContent = "选项内容举例...";

                    ChoseItems.Add(item);

                }

                Questions.Add(new question(i, "__第" + (i + 1).ToString() + "题", ChoseItems));

            }

            datagrid1.ItemsSource = Questions;

            ShowChildCell(datagrid1, 2, 9);

        }

        public static void ShowChildCell(DataGrid datagrid, int colNum, int childCellCount = 9)

        {

            DataGridTemplateColumn templeColumn = datagrid.Columns[colNum] as DataGridTemplateColumn;

            if (templeColumn == null) return;

            DataGridCell dataGridCell = GetDataGridCell(datagrid, 0, colNum);

            DataGridCellInfo dataGridCellInfo = new DataGridCellInfo(dataGridCell);

            object item = dataGridCellInfo.Item;

            FrameworkElement element = templeColumn.GetCellContent(item);

            TextBox textBlockOther = (TextBox)templeColumn.CellTemplate.FindName("R1", element);

            textBlockOther.Visibility = Visibility.Hidden;

        }

        public static DataGridCell GetDataGridCell(DataGrid datagrid, int rowIndex, int columnIndex)

        {

            try

            {

                DataGridRow rowContainer = GetDataGridRow(datagrid, rowIndex);

                if (rowContainer != null)

                {

                    DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);

                    //这行代码是通过行得到单元格

                    DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);

                    //这行代码是通过index得到具体的单元格

                    if (cell == null)

                    {

                        datagrid.ScrollIntoView(rowContainer, datagrid.Columns[columnIndex]);

                        cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);

                    }

                    return cell;

                }

            }

            catch

            {

                return null;

            }

            return new DataGridCell();

        }

        public static DataGridRow GetDataGridRow(DataGrid dataGrid, int index)

        {

            if (index >= dataGrid.Items.Count)

            {

                throw new IndexOutOfRangeException(String.Format("Index {0} is out of range.", index));

            }

            DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);

            if (row == null)

            {

                // may be virtualized, bring into view and try again

                dataGrid.ScrollIntoView(dataGrid.Items[index]);

                WaitFor(TimeSpan.Zero, DispatcherPriority.SystemIdle);

                row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);

            }

            return row;

        }

        public static void WaitFor(TimeSpan time, DispatcherPriority priority)

        {

            DispatcherTimer timer = new DispatcherTimer(priority);

            timer.Tick += new EventHandler(OnDispatched);

            timer.Interval = time;

            DispatcherFrame dispatcherFrame = new DispatcherFrame(false);

            timer.Tag = dispatcherFrame;

            timer.Start();

            Dispatcher.PushFrame(dispatcherFrame);

        }

        public static void OnDispatched(object sender, EventArgs args)

        {

            DispatcherTimer timer = (DispatcherTimer)sender;

            timer.Tick -= new EventHandler(OnDispatched);

            timer.Stop();

            DispatcherFrame frame = (DispatcherFrame)timer.Tag;

            frame.Continue = false;

        }

        public static T GetVisualChild<T>(Visual parent) where T : Visual

        {

            T childContent = default(T);

            int numVisuals = VisualTreeHelper.GetChildrenCount(parent);

            for (int i = 0; i < numVisuals; i++)

            {

                Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);

                childContent = v as T;

                if (childContent == null)

                {

                    childContent = GetVisualChild<T>(v);

                }

                if (childContent != null)

                {

                    break;

                }

            }

            return childContent;

        }

    }

}