在WPF应用程序中使用MVVM模式时，我想设置行中记录的"Editing State"。
每次用户通过点击"编辑"按钮开始编辑记录时，该行应切换到"编辑"模式。
完成后，他可以通过单击同一按钮或其他按钮来保存该行中的所有更改
如何在单击"编辑"按钮时为选定行中的所有单元格设置编辑模式（IsReadOnly = true/false）？
任何帮助都是感激的!
这是我的当前代码：
XAML语言

<Window x:Class="TotalRows.TotalRowsWindow"
    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:TotalRows" 
    mc:Ignorable="d"
    x:Name="xMainWindow"
    Title="RowsTotalWindow" Height="450" Width="800">
    
    <Window.DataContext>
        <local:ExampleData/>
    </Window.DataContext>
    <Grid>
        <StackPanel >
            <DataGrid x:Name="myGrid" IsReadOnly="True" CanUserAddRows="False" SelectionMode="Single" CanUserDeleteRows="False" 
              ItemsSource="{Binding ItemsViewCollection}"   RowDetailsVisibilityMode="Collapsed" 
              SelectedItem="{Binding SelectedItemRow, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
              AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTemplateColumn>
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <DockPanel HorizontalAlignment="Stretch">
                                    <ToggleButton x:Name="btnEditItem" Content="Edit" Width="50" Height="20" Margin="0 0 3 0"                                    
                                    Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid}, Path=DataContext.UpdateItemCommand}" 
                                    CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=DataGridRow}, Path=DataContext}"/>
                                </DockPanel>
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                    <DataGridTextColumn x:Name="gr" Binding="{Binding Group}" Header="Gr" Width="30"   />
                    <DataGridTextColumn x:Name="one" Binding="{Binding Col_1}" Header="h1" Width="30"   />
                    <DataGridTextColumn x:Name="two" Binding="{Binding Col_2}" Header="h2" Width="30"  />
                    <DataGridTextColumn x:Name="tree" Binding="{Binding Col_3}" Header="h3" Width="30" />
                </DataGrid.Columns>
            </DataGrid>
        </StackPanel>
    </Grid>
</Window>

代码隐藏

namespace TotalRows
{

    public class ItemClass
    {
        public int Group { get; set; }
        public string Title { get; set; }

        public int Col_1 { get; set; }
        public int Col_2 { get; set; }
        public int Col_3 { get; set; }
    }

    public class ExampleData
    {
        private bool _IsReadMode;
        public bool IsReadMode
        {
            get { return _IsReadMode; }
            set
            {
                _IsReadMode = value;
                OnPropertyChanged(nameof(IsReadMode));
            }
        }

        private ItemClass _selectedItem = null;
        public ItemClass SelectedItemRow
        {
            get { return _selectedItem; }
            set
            {
                _selectedItem = value;
                OnPropertyChanged(nameof(SelectedItemRow));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private ObservableCollection<ItemClass> _items;
        public ObservableCollection<ItemClass> Items
        {
            get
            {
                return _items;
            }
            set
            {
                if (_items != value)
                {
                    _items = value;
                    OnPropertyChanged(nameof(Items));

                }
            }
        }

        private ICollectionView _itemsViewCollection;
        public ICollectionView ItemsViewCollection
        {
            get
            {
                return _itemsViewCollection;
            }
            set
            {
                if (_itemsViewCollection != value)
                {
                    _itemsViewCollection = value;
                    OnPropertyChanged(nameof(ItemsViewCollection));
                }
            }
        }
        
        public ICommand UpdateItemCommand { get; private set; }

        public ExampleData()
        {
            IsReadMode = true;
            UpdateItemCommand = new ViewModelCommand(param => updateItemCommand(param));

            Items = new ObservableCollection<ItemClass>()
            {
              new ItemClass() {Group=1, Title="Item1", Col_1=100, Col_2=150, Col_3=250},

              new ItemClass() {Group=2, Title="Item1", Col_1=50, Col_2=2, Col_3=200},
              new ItemClass() {Group=2, Title="Item2", Col_1=50, Col_2=100, Col_3=40},

              new ItemClass() {Group=3, Title="Item1", Col_1=60, Col_2=25, Col_3=230},
              new ItemClass() {Group=3, Title="Item2", Col_1=30, Col_2=25, Col_3=0},
              new ItemClass() {Group=3, Title="Item3", Col_1=9, Col_2=100, Col_3=20},

              new ItemClass() {Group=4, Title="Item1", Col_1=46, Col_2=32, Col_3=30},
          };

          ItemsViewCollection = CollectionViewSource.GetDefaultView(Items);
          ItemsViewCollection.GroupDescriptions.Add(new PropertyGroupDescription("Group"));

      }
      private void updateItemCommand(object param)
      {
        IsReadMode = !IsReadMode;
    }
  }
}