Silverlight 中DataGrid自定义列的绑定问题

前两天因为DataGrid自定义列中Command命令绑定问题，让我耽误了好多时间，今天终于OK了，如果有初学者和我一样的话，可以简单看看

首先大家应该知道绑定不上的原因，因为是在DataGrid里，那么里面的属性，都是来源于当前的DataGrid数据源的，所以说，如果你想获得数据源外的信息就需要上下文代理

首先定义一个类：DataContextProxy继承自FrameworkElement

这个类在博客园中有写的，参考这片博文，在这里谢谢这个博主啦

http://www.cnblogs.com/whinsh/archive/2011/07/06/2098766.html

然后是在页面中引用这个代理

全文代码如下

 这个是页面的信息

<UserControl x:Class="MVVM3.View.StudentListView"
    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" 
             xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"            
            xmlns:vm="clr-namespace:MVVM3.ViewModel" >
  
    <UserControl.Resources>
        <vm:DataContextProxy x:Key="DataContextProxy"/>
    </UserControl.Resources>
    <Grid x:Name="LayoutRoot" Background="White">
        <sdk:DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Students,Mode=TwoWay}" Height="169" HorizontalAlignment="Left" Margin="46,25,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="227" >
            <sdk:DataGrid.Columns>
                <sdk:DataGridTextColumn Header="姓名" Binding="{Binding Name,Mode=TwoWay}" ></sdk:DataGridTextColumn>
                <sdk:DataGridTextColumn Header="电话" Binding="{Binding Tel,Mode=TwoWay}"></sdk:DataGridTextColumn>
                <sdk:DataGridTemplateColumn Header="操作">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="删除" Command="{Binding Path=DataSource.DeleteCommand,Mode=OneWay,Source={StaticResource DataContextProxy}}" CommandParameter="{Binding Name}"></Button>
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
            </sdk:DataGrid.Columns>
        </sdk:DataGrid>
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="44,206,0,0" Name="button1" VerticalAlignment="Top" Width="75" Command="{Binding QueryCommand}" />
    </Grid>
</UserControl>

这个是后台代码

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 MVVM3.ViewModel;

namespace MVVM3.View
{
    public partial class StudentListView : UserControl
    {
        public StudentListView()
        {
            
            InitializeComponent();
            StudentViewModel svm = new StudentViewModel();
            base.DataContext = svm;
        }
    }
}

 

这个是StudentViewModel类了

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
using MVVM3.Model;
using System.Collections.ObjectModel;
using GalaSoft.MvvmLight.Command;
using MVVM3.View;

namespace MVVM3.ViewModel
{
    public class StudentViewModel : INotifyPropertyChanged
    {
        #region 私有字段
        private ObservableCollection<Student> students;
        #endregion

        #region 构造函数

        public StudentViewModel()
        {
         
            QueryCommand = new RelayCommand(QueryStudent);
            DeleteCommand = new RelayCommand<string>(DeteteStudent);
        }
        #endregion

        #region 公共属性
        public ObservableCollection<Student> Students
        {
            get { return students; }
            set
            {
                students = value;
                PropertyChanged(this, new PropertyChangedEventArgs("Students"));
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;

        #region Command
        /// <summary>
        /// 查询方法
        /// </summary>
        public RelayCommand QueryCommand { get; set; }

        /// <summary>
        /// 删除方法
        /// </summary>
        public RelayCommand<string> DeleteCommand { get; set; }
        #endregion
        #endregion

        #region 私有方法
        /// <summary>
        /// 查询信息
        /// </summary>
        private void QueryStudent()
        {
            Students = new ObservableCollection<Student>();
            Student s1 = new Student("aa","bb");
            Student s2 = new Student("cc","dd");
            Students.Add(s1);
            Students.Add(s2);
        }
        /// <summary>
        /// 删除学生
        /// </summary>
        private void DeteteStudent(string name)
        {
            MessageBox.Show("删除学生："+name);
        }
        #endregion

    }
}

做的不好请多关照，主要是希望和我一样的初学者朋友，能知道自定义列的绑定方法，别无他求！