Silverlight4给DataGrid添加ContextMenu右键菜单

Toolkit Samples中的示例是将ContextMenu添加到ListBox的ItemTemplate中

而DataGrid由于没有ItemTemplate,所以稍有不同

<UserControl 
    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"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400"
    x:Class="SilverlightApplication8.MainPage"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data">

    <Grid x:Name="LayoutRoot" Background="White">
        <data:DataGrid Name="dg" ItemsSource="{Binding}" LoadingRow="dg_LoadingRow"/>
    </Grid>
</UserControl>

添加引用System.Windows.Controls和System.Windows.Controls.Input.Toolkit

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

using System.Windows.Data;
namespace SilverlightApplication8
{
    public partial class MainPage : UserControl
    {
        PagedCollectionView pcv;

        public MainPage()
        {
            InitializeComponent();

            List<Person> list = new List<Person>();
            list.Add(new Person { ID = 1, Name = "张三" });
            list.Add(new Person { ID = 2, Name = "李四" });
            list.Add(new Person { ID = 3, Name = "王五" });

            pcv = new PagedCollectionView(list);
            dg.ItemsSource = pcv;
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            Person p = ((MenuItem)sender).DataContext as Person;
            if (p != null)
            {
                pcv.Remove(p);
            }
        }

        private void dg_LoadingRow(object sender, DataGridRowEventArgs e)
        {
            DataGridRow dgr = e.Row;
            Person p = (Person)dgr.DataContext;

            ContextMenu cm = new ContextMenu();
            MenuItem mi = new MenuItem();
            mi.Header = "删除 " + p.Name;
            mi.Click += MenuItem_Click;
            cm.Items.Add(mi);

            ContextMenuService.SetContextMenu(dgr, cm);
        }
    }

    public class Person
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }
}

最好不要偷懒将ContextMenu直接作为DataGrid的右键菜单

这样在点击时需要根据DataGrid的SelectedItem获取选中行

就会造成当前选中第一行,鼠标放在第三行上右击"删除",最后却会删除第一行的情况