linq to sql用partial扩展属性,创建一个部分类（用于多表连接）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            contestDataContext _contest = new contestDataContext();
           dataGridView2.DataSource = _contest.Info;

        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
     public partial  class Info//做一个Info的部分（partial）类，
    {
         public string Nname//
         {
             get//获取属性
             {

                 return this.Nation1.Name;//调取主键表中的name，nation1是主键表
             }

         }
    }
}