?? exceptionpatternconverter.cs
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#region Copyright & License
//
// Copyright 2001-2005 The Apache Software Foundation
//
// Licensed 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.Text;
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
this.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>
/// 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>
override protected void Convert(TextWriter writer, LoggingEvent loggingEvent)
{
string exceptionString = loggingEvent.GetExceptionString();
if (exceptionString != null && exceptionString.Length > 0)
{
writer.WriteLine(exceptionString);
}
}
}
}
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