BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/ThreadContext.cs

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#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with 
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

using System;
using System.Collections;

using log4net.Util;

namespace log4net
{
	/// <summary>
	/// The log4net Thread Context.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The <c>ThreadContext</c> provides a location for thread specific debugging 
	/// information to be stored.
	/// The <c>ThreadContext</c> properties override any <see cref="GlobalContext"/>
	/// properties with the same name.
	/// </para>
	/// <para>
	/// The thread context has a properties map and a stack.
	/// The properties and stack can 
	/// be included in the output of log messages. The <see cref="log4net.Layout.PatternLayout"/>
	/// supports selecting and outputting these properties.
	/// </para>
	/// <para>
	/// The Thread Context provides a diagnostic context for the current thread. 
	/// This is an instrument for distinguishing interleaved log
	/// output from different sources. Log output is typically interleaved
	/// when a server handles multiple clients near-simultaneously.
	/// </para>
	/// <para>
	/// The Thread Context is managed on a per thread basis.
	/// </para>
	/// </remarks>
	/// <example>Example of using the thread context properties to store a username.
	/// <code lang="C#">
	/// ThreadContext.Properties["user"] = userName;
	///	log.Info("This log message has a ThreadContext Property called 'user'");
	/// </code>
	/// </example>
	/// <example>Example of how to push a message into the context stack
	/// <code lang="C#">