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ASP.NET中显示Linq To SQL输出的SQL语句

最近在使用Linq To SQL的时候,为了了解不同Linq语句对性能造成的不同影响,需要获得Linq To SQL生成的SQL语句。


如果是在桌面程序中,只需要

_context.Log = Console.Out;
即可在控制台输出SQL语句。可是在ASP.NET中又该怎么办呢?


这时我想起了StringWriter。用它就可以代替Console.Out帮我们接收输出的日志,保存在一个StringBuilder里。

于是构造一个辅助类:


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

namespace Clowwindy.Models
{
    public static class LogHelper
    {
        public static StringBuilder Log = new StringBuilder();
        public static TextWriter In = new StringWriter(Log);
        public static string GetAllLog()
        {
            In.Flush();
            return Log.ToString();
        }
        public static void Clean()
        {
            Log = new StringBuilder();
            In = new StringWriter(Log);
        }
    }
}

  再添加一个页面log.aspx,用来显示日志:


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Log.aspx.cs" Inherits="Clowwindy.Log" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>SQL Log</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:Button ID="btn_Clean" runat="server" Text="清空"
        onclick="btn_Clean_Click"/>
    <div>
        <asp:Literal ID="Literal1" runat="server"></asp:Literal>
    </div>
    </form>
</body>
</html>

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Clowwindy.Models;

namespace Clowwindy
{
    public partial class Log : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.UserHostAddress != "127.0.0.1")
            {
                Response.End();
                return;
            }
            Literal1.Text = LogHelper.GetAllLog().Replace("\n","\n<br/>");
        }

        protected void btn_Clean_Click(object sender, EventArgs e)
        {
            LogHelper.Clean();
            Literal1.Text = null;
        }
    }
}

 最后在所有new DataContext的地方加上_context.Log = LogHelper.In:


        public Repository()
        {
            _context = new TDataContext();
            _context.Log = LogHelper.In;
        }
 打开log.aspx,即可看到之前执行的SQL语句。

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