#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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// .NET Compact Framework 1.0 has no support for ASP.NET
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// SSCLI 1.0 has no support for ASP.NET
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#if !NETCF && !SSCLI && !CLIENT_PROFILE
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using System.Web;
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using log4net.Layout;
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using log4net.Core;
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namespace log4net.Appender
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{
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/// <summary>
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/// <para>
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/// Appends log events to the ASP.NET <see cref="TraceContext"/> system.
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/// </para>
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/// </summary>
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/// <remarks>
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/// <para>
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/// Diagnostic information and tracing messages that you specify are appended to the output
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/// of the page that is sent to the requesting browser. Optionally, you can view this information
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/// from a separate trace viewer (Trace.axd) that displays trace information for every page in a
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/// given application.
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/// </para>
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/// <para>
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/// Trace statements are processed and displayed only when tracing is enabled. You can control
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/// whether tracing is displayed to a page, to the trace viewer, or both.
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/// </para>
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/// <para>
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/// The logging event is passed to the <see cref="TraceContext.Write(string)"/> or
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/// <see cref="TraceContext.Warn(string)"/> method depending on the level of the logging event.
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/// The event's logger name is the default value for the category parameter of the Write/Warn method.
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/// </para>
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/// </remarks>
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/// <author>Nicko Cadell</author>
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/// <author>Gert Driesen</author>
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/// <author>Ron Grabowski</author>
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public class AspNetTraceAppender : AppenderSkeleton
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{
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#region Public Instances Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="AspNetTraceAppender" /> class.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Default constructor.
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/// </para>
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/// </remarks>
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public AspNetTraceAppender()
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{
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}
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#endregion // Public Instances Constructors
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#region Override implementation of AppenderSkeleton
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/// <summary>
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/// Write the logging event to the ASP.NET trace
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/// </summary>
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/// <param name="loggingEvent">the event to log</param>
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/// <remarks>
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/// <para>
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/// Write the logging event to the ASP.NET trace
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/// <c>HttpContext.Current.Trace</c>
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/// (<see cref="TraceContext"/>).
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/// </para>
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/// </remarks>
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override protected void Append(LoggingEvent loggingEvent)
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{
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// check if log4net is running in the context of an ASP.NET application
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if (HttpContext.Current != null)
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{
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// check if tracing is enabled for the current context
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if (HttpContext.Current.Trace.IsEnabled)
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{
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if (loggingEvent.Level >= Level.Warn)
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{
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HttpContext.Current.Trace.Warn(m_category.Format(loggingEvent), RenderLoggingEvent(loggingEvent));
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}
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else
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{
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HttpContext.Current.Trace.Write(m_category.Format(loggingEvent), RenderLoggingEvent(loggingEvent));
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}
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}
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}
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}
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/// <summary>
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/// This appender requires a <see cref="Layout"/> to be set.
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/// </summary>
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/// <value><c>true</c></value>
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/// <remarks>
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/// <para>
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/// This appender requires a <see cref="Layout"/> to be set.
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/// </para>
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/// </remarks>
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override protected bool RequiresLayout
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{
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get { return true; }
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}
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#endregion // Override implementation of AppenderSkeleton
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#region Public Instance Properties
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/// <summary>
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/// The category parameter sent to the Trace method.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Defaults to %logger which will use the logger name of the current
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/// <see cref="LoggingEvent"/> as the category parameter.
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/// </para>
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/// <para>
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/// </para>
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/// </remarks>
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public PatternLayout Category
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{
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get { return m_category; }
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set { m_category = value; }
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}
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#endregion
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#region Private Instance Fields
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/// <summary>
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/// Defaults to %logger
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/// </summary>
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private PatternLayout m_category = new PatternLayout("%logger");
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#endregion
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}
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}
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#endif // !NETCF && !SSCLI
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