windows phone上下文菜单ContextMenu的使用示例

1. 新建一个WP项目，命名为contextmenu,然后往界面拖入一个ListBox控件listBox1,接着切换到XAML代码界面设置其属性，代码如下

 <ListBox Height="437" HorizontalAlignment="Left" Margin="10,119,0,0" Name="listBox1" VerticalAlignment="Top" Width="460" ItemsSource="{Binding}" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                           <TextBlock FontSize="40" Text="{Binding MyName}"/> 
                            <TextBlock FontSize="40" Text="{Binding Company}"/>
                           </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

      2.设置好上述属性后，在<TextBlock FontSize="40" Text="{Binding Company}"/>下边拖放上下文控件ContextMenu，完整代码如下：

<ListBox Height="437" HorizontalAlignment="Left" Margin="10,119,0,0" Name="listBox1" VerticalAlignment="Top" Width="460" ItemsSource="{Binding}" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                           <TextBlock FontSize="40" Text="{Binding MyName}"/> 
                            <TextBlock FontSize="40" Text="{Binding Company}"/>
                            <toolkit:ContextMenuService.ContextMenu>
                                <toolkit:ContextMenu>
                                    <toolkit:MenuItem Header="变色" Click="MenuItem_Click"/>
                                    <toolkit:MenuItem Header="删除" Click="MenuItem_Click"/>
                                    <toolkit:MenuItem Header="全部删除" Click="MenuItem_Click"/>
                                </toolkit:ContextMenu>
                            </toolkit:ContextMenuService.ContextMenu>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

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   3.切换到.CS后台代码，加入命名空间的引用：using System.Collections.ObjectModel;

   4.本例的完整后台C#代码如下：

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 Microsoft.Phone.Controls;
using System.Collections.ObjectModel;

namespace contextmenu
{
    public partial class MainPage : PhoneApplicationPage
    {
        ObservableCollection<Person> personlist = new ObservableCollection<Person>();
        Person selectperson = null;
        // 构造函数
        public MainPage()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            //throw new NotImplementedException();
            personlist.Add(new Person() { MyName = "张三", Company = "某某有限公司" });
            personlist.Add(new Person() { MyName = "有健", Company = "天津有限公司" });
            personlist.Add(new Person() { MyName = "奉沈", Company = "广西有限公司" });
            personlist.Add(new Person() { MyName = "李四", Company = "无名有限公司" });
            personlist.Add(new Person() { MyName = "王五", Company = "王某有限公司" });
            personlist.Add(new Person() { MyName = "小明", Company = "小明有限公司" });
            listBox1.ItemsSource = personlist;
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            MenuItem menu = (MenuItem)sender;
            string header = (sender as MenuItem).Header.ToString();
            ListBoxItem selectlistitem = this.listBox1.ItemContainerGenerator.ContainerFromItem((sender as MenuItem).DataContext) as ListBoxItem;
            if (selectlistitem == null)
            {
                return;
            }
            //判断选择的是哪一项
            if (menu.Header.ToString() == "变色")
            {
                selectlistitem.Background = new SolidColorBrush(Colors.Green);
            }
             //以下删除操作有一个问题，好像并不能把选中项删除
            else if (menu.Header.ToString() == "删除")
            {
                selectperson = listBox1.SelectedItem as Person;
                if (selectperson == null)
                {
                    MessageBox.Show("请先选择一个选项再进行删除！");
                }
                else
                {
                    selectperson = (sender as Person);
                    personlist.Remove(selectperson);
                    listBox1.ItemsSource = personlist;
                }
            }
            else if (menu.Header.ToString() == "全部删除")
            {
                personlist.Clear();
                listBox1.ItemsSource = personlist;
            }
        }
    }
    //定义联系人信息的类
    public class Person
    {
        public string MyName
        {
            get;
            set;
        }
        public string Company
        {
            get;
            set;
        }
    }
}

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