Note Tuesday, April 12, 2011:10:28 PM

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

namespace  Core.Diagnostics {
    using Web;

    /*
     * web.config
<configuration>
  <system.diagnostics>
    <trace autoflush="true" indentsize="4">
      <listeners>
        <add name="HttpContextTraceListener" type="Core.Diagnostics.HttpContextTraceListener, CodeGeneration.Core"/>
        <remove name="Default" />
      </listeners>
    </trace>
  </system.diagnostics>
</configuration>

     */
    public class HttpContextTraceListener:TraceListener {
        static object s_contextKey = new object();

        public static StringBuilder CurrentBuilder {
            get {
                return HttpContext.Current.GetOrAdd<StringBuilder>(s_contextKey,() => new StringBuilder());
            }
        }

        public override void Write(string message) {
            CurrentBuilder.Append(message);
        }

        public override void WriteLine(string message) {
            CurrentBuilder.AppendLine(message);
        }
    }
}