BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Appender/FileAppender.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.IO;
using System.Text;
using System.Threading;
using log4net.Util;
using log4net.Layout;
using log4net.Core;

namespace log4net.Appender
{
#if !NETCF
	/// <summary>
	/// Appends logging events to a file.
	/// </summary>
	/// <remarks>
	/// <para>
	/// Logging events are sent to the file specified by
	/// the <see cref="File"/> property.
	/// </para>
	/// <para>
	/// The file can be opened in either append or overwrite mode 
	/// by specifying the <see cref="AppendToFile"/> property.
	/// If the file path is relative it is taken as relative from 
	/// the application base directory. The file encoding can be
	/// specified by setting the <see cref="Encoding"/> property.
	/// </para>
	/// <para>
	/// The layout's <see cref="ILayout.Header"/> and <see cref="ILayout.Footer"/>
	/// values will be written each time the file is opened and closed
	/// respectively. If the <see cref="AppendToFile"/> property is <see langword="true"/>
	/// then the file may contain multiple copies of the header and footer.
	/// </para>
	/// <para>
	/// This appender will first try to open the file for writing when <see cref="ActivateOptions"/>
	/// is called. This will typically be during configuration.
	/// If the file cannot be opened for writing the appender will attempt
	/// to open the file again each time a message is logged to the appender.
	/// If the file cannot be opened for writing when a message is logged then
	/// the message will be discarded by this appender.
	/// </para>
    /// <para>