<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Tracing" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Logging trace output to <asp:Literal runat="server" Text="<%$ appSettings:traceFile %>" /></h2>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.IO;
using System.Web;
using System.Configuration;
public partial class Tracing : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Trace.TraceFinished += Trace_Finished;
Trace.Write("Using Page Trace", "Subscribed to TraceFinished event");
}
void Trace_Finished(Object sender, TraceContextEventArgs e)
{
string traceFile = ConfigurationManager.AppSettings["traceFile"];
using (StreamWriter w = File.AppendText(traceFile))
{
int i = 0;
foreach (TraceContextRecord r in e.TraceRecords)
w.WriteLine("{0}) {1}:{2}", ++i, r.Category, r.Message);
}
}
}
File: Web.config
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="traceFile" value="c:\temp\trace_log.txt"/>
</appSettings>
<system.web>
<compilation debug="true"/>
<trace enabled="true" pageOutput="false" localOnly="true" />
</system.web>
</configuration>