BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Layout/PatternLayout.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 System.IO;

using log4net.Core;
using log4net.Layout.Pattern;
using log4net.Util;
using log4net.Util.PatternStringConverters;
using AppDomainPatternConverter=log4net.Layout.Pattern.AppDomainPatternConverter;
using DatePatternConverter=log4net.Layout.Pattern.DatePatternConverter;
using IdentityPatternConverter=log4net.Layout.Pattern.IdentityPatternConverter;
using PropertyPatternConverter=log4net.Layout.Pattern.PropertyPatternConverter;
using UserNamePatternConverter=log4net.Layout.Pattern.UserNamePatternConverter;
using UtcDatePatternConverter=log4net.Layout.Pattern.UtcDatePatternConverter;

namespace log4net.Layout
{
	/// <summary>
	/// A flexible layout configurable with pattern string.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The goal of this class is to <see cref="PatternLayout.Format(TextWriter,LoggingEvent)"/> a 
	/// <see cref="LoggingEvent"/> as a string. The results
	/// depend on the <i>conversion pattern</i>.
	/// </para>
	/// <para>
	/// The conversion pattern is closely related to the conversion
	/// pattern of the printf function in C. A conversion pattern is
	/// composed of literal text and format control expressions called
	/// <i>conversion specifiers</i>.
	/// </para>
	/// <para>
	/// <i>You are free to insert any literal text within the conversion
	/// pattern.</i>
	/// </para>
	/// <para>
	/// Each conversion specifier starts with a percent sign (%) and is
	/// followed by optional <i>format modifiers</i> and a <i>conversion
	/// pattern name</i>. The conversion pattern name specifies the type of
	/// data, e.g. logger, level, date, thread name. The format