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。 (责任编辑:admin) |