BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Layout/Pattern/ExceptionPatternConverter.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.Diagnostics;
using System.IO;
using log4net.Core;

namespace log4net.Layout.Pattern
{
	/// <summary>
	/// Write the exception text to the output
	/// </summary>
	/// <remarks>
	/// <para>
	/// If an exception object is stored in the logging event
	/// it will be rendered into the pattern output with a
	/// trailing newline.
	/// </para>
	/// <para>
	/// If there is no exception then nothing will be output
	/// and no trailing newline will be appended.
	/// It is typical to put a newline before the exception
	/// and to have the exception as the last data in the pattern.
	/// </para>
	/// </remarks>
	/// <author>Nicko Cadell</author>
	internal sealed class ExceptionPatternConverter : PatternLayoutConverter 
	{
		/// <summary>
		/// Default constructor
		/// </summary>
		public ExceptionPatternConverter()
		{
			// This converter handles the exception
			IgnoresException = false;
		}

		/// <summary>
		/// Write the exception text to the output
		/// </summary>
		/// <param name="writer"><see cref="TextWriter" /> that will receive the formatted result.</param>
		/// <param name="loggingEvent">the event being logged</param>
		/// <remarks>
		/// <para>