lambda表达式3

强类型DataContext

NorthwindDataContext.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Linq;
using System.Data;

namespace DannyWeb
{
    public class NorthwindDataContext : DataContext
    {
        public Table<Customer> Customers;
        public NorthwindDataContext(IDbConnection connection) : base(connection) { }
        public NorthwindDataContext(string connection) : base(connection) { }
    }
}

显示页
Default2.aspx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DannyWeb;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        NorthwindDataContext ctx = new NorthwindDataContext("server=.;database=Northwind;uid=sa;pwd=");
        GridView1.DataSource = from c in ctx.Customers
                               where c.CustomerID.StartsWith("A")
                               select new { 顾?客¨ªID = c.CustomerID, 顾?客¨ª名? = c.Name, 城?市ºD = c.City };
        GridView1.DataBind();
    }
}

显示结果：

2011-6-2 13:18 danny

显示日志：
Default2.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DannyWeb;
using System.IO;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        NorthwindDataContext ctx = new NorthwindDataContext("server=.;database=Northwind;uid=sa;pwd=");
        StreamWriter sw = new StreamWriter(Server.MapPath("log.txt"), true);
        ctx.Log = sw;
        GridView1.DataSource = from c in ctx.Customers
                               where c.CustomerID.StartsWith("A")
                               select new { 顾?客¨ªID = c.CustomerID, 顾?客¨ª名? = c.Name, 城?市ºD = c.City };
        GridView1.DataBind();
        sw.Close();
    }
}

日志
log.txt

SELECT [t0].[CustomerID] AS [顾客ID], [t0].[ContactName] AS [顾客名], [t0].[City] AS [城市]
FROM [Customers] AS [t0]
WHERE [t0].[CustomerID] LIKE @p0
-- @p0: Input NVarChar (Size = 2; Prec = 0; Scale = 0) [A%]
-- Context: SqlProvider(Sql2000) Model: AttributedMetaModel Build: 4.0.30319.1

2011-6-2 13:24 danny