silverlight datagrid列宽自动填充

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;


namespace SilverlightApplication90
{
    public partial class MainPage : UserControl
    {
        private DataGrid TestDataGrid = null;
        public MainPage()
        {
            InitializeComponent();
            TestDataGrid = new DataGrid();
            TestDataGrid.AutoGenerateColumns = true;
            TestDataGrid.SizeChanged += new SizeChangedEventHandler(TestDataGrid_SizeChanged);
            LayoutRoot.Children.Add(TestDataGrid);
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
        }
        /// <summary>
        /// 当DataGrid的Size改变时触发事件,使第二列的宽度填充DataGrid剩余的空间。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void TestDataGrid_SizeChanged(object sender,SizeChangedEventArgs e)
        {
            double dataGridWidth = TestDataGrid.ActualWidth;
            double otherColumnsWidth = TestDataGrid.Columns[0].ActualWidth;
            double borderThickness = TestDataGrid.BorderThickness.Left + TestDataGrid.BorderThickness.Right;
            TestDataGrid.Columns[1].Width = new DataGridLength(dataGridWidth - otherColumnsWidth - borderThickness);
        }
        void MainPage_Loaded(object sender,RoutedEventArgs e)
        {
            List<Student> items = GetStudents();
            TestDataGrid.ItemsSource = items;
        }
        /// <summary>
        /// 获取数据源
        /// </summary>
        /// <returns></returns>
        private List<Student> GetStudents()
        {
            List<Student> items = new List<Student>();
            for (int i = 0; i < 20; i++)
            {
                items.Add(new Student(i,"张三" + i));
            }
            return items;
        }
    }
    public class Student
    {
        public Student() { }
        public Student(int _studentID,string _studentName)
        {
            this.StudentID = _studentID;
            this.StudentName = _studentName;
        }
        private int studentID;
        public int StudentID
        {
            get { return studentID; }
            set { studentID = value; }
        }
        private string studentName;
        public string StudentName
        {
            get { return studentName; }
            set { studentName = value; }
        }
    }
}