WPF 将行添加到 XML 绑定数据网格

调试时，无法向数据网格添加行。

设置：我有一个 XML 文件 （C：''test.xml），用作 DataGrid 的 XmlDataProvider

XAML：

<Window x:Class="iDraft.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="185" Width="176">
<Grid>
    <Grid.DataContext>
        <XmlDataProvider x:Name="myData" XPath="Table/ENTRY" />
    </Grid.DataContext>
    <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding}" CanUserAddRows="True">
    <DataGrid.Columns>
            <DataGridTextColumn Header="Text" Binding="{Binding XPath=text, Mode=TwoWay}"/>
            <DataGridTemplateColumn Header="Combobox">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox Text="{Binding XPath=combo, Mode=TwoWay}">
                            <ComboBoxItem>0</ComboBoxItem>
                            <ComboBoxItem>1</ComboBoxItem>
                            <ComboBoxItem>2</ComboBoxItem>
                            <ComboBoxItem>3</ComboBoxItem>
                            <ComboBoxItem>4</ComboBoxItem>
                        </ComboBox>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>                
        </DataGrid.Columns>
    </DataGrid>
  </Grid>
</Window>

C#：

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.Xml;
namespace iDraft
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            myData.Source = new Uri(@"C:'test.xml");
        }
    }
}

XML（测试.xml）：

<?xml version="1.0" encoding="utf-8" ?>
<Table>
  <ENTRY>
    <text>1</text>
    <combo>1</combo>
  </ENTRY>
  <ENTRY>
    <text>2</text>
    <combo>1</combo>
  </ENTRY>
</Table>

我挖掘了一些旧的 vb.net 代码，发现了以下内容：

Imports System.Xml
Imports System.Data
Class MainWindow
 Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
    Dim xmlFile As XmlReader
    Dim ds As New DataSet
    xmlFile = XmlReader.Create("C:'test.xml", New XmlReaderSettings())
    ds.ReadXml(xmlFile)
    xmlFile.Close()
    myData.Source = ds.Tables(0)
  End Sub
End Class