第一步：在DataGrid中添加ContextMenu

        <DataGrid.ContextMenu><ContextMenu><MenuItem Header="删除选中项" Command="{Binding DeleteSelectedCommand}" /></ContextMenu></DataGrid.ContextMenu>

第二步：在ViewModel中创建一个命令（DeleteSelectedCommand）来处理删除选中项的逻辑。确保为ViewModel设置了DataContext。其中Items就是DataGrid中每行的对象集合

using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System.Collections.ObjectModel;namespace YourNamespace
{public class MainViewModel : ViewModelBase{public MainViewModel(){Items = new ObservableCollection<Item>{new Item { Name = "Item 1" },new Item { Name = "Item 2" },new Item { Name = "Item 3" }};DeleteSelectedCommand = new RelayCommand(DeleteSelected, CanDeleteSelected);}public ObservableCollection<Item> Items { get; }public RelayCommand DeleteSelectedCommand { get; }private bool CanDeleteSelected(){return dataGrid?.SelectedItems.Count > 0;}private void DeleteSelected(){foreach (var selectedItem in dataGrid.SelectedItems.Cast<Item>().ToList()){Items.Remove(selectedItem);}}private DataGrid dataGrid;public void SetDataGrid(DataGrid grid){dataGrid = grid;}}
}

第三步：在MainWindow.xaml.cs中设置DataContext和DataGrid的关联：

public partial class MainWindow : Window
{public MainWindow(){InitializeComponent();DataContext = new MainViewModel();(DataContext as MainViewModel)?.SetDataGrid(dataGrid);}
}

总结：xaml中：对DataGrid添加ContextMenu并绑定Command

        ViewModel中：设置好Command

        xaml的后端：将DataGrid传给ViewModel