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ExceptionMessageFormatProvider.cs
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ExceptionMessageFormatProvider.cs
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//
// Copyright (c) 2004-2021 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
namespace NLog.Internal
{
using System;
/// <summary>
/// FormatProvider that renders an exception-object as $"{ex.GetType()}: {ex.Message}"
/// </summary>
internal sealed class ExceptionMessageFormatProvider : IFormatProvider, ICustomFormatter
{
internal static readonly ExceptionMessageFormatProvider Instance = new ExceptionMessageFormatProvider();
string ICustomFormatter.Format(string format, object arg, IFormatProvider formatProvider)
{
if (arg is Exception exception)
{
exception = GetPrimaryException(exception);
return $"{exception.GetType().ToString()}: {exception.Message}";
}
else
{
return string.Format("{0}", arg);
}
}
private static Exception GetPrimaryException(Exception exception)
{
#if !NET35
if (exception is AggregateException aggregateException)
{
if (aggregateException.InnerExceptions?.Count == 1)
{
var innerException = aggregateException.InnerExceptions[0];
if (!(innerException is AggregateException))
return innerException; // Skip calling Flatten()
}
aggregateException = aggregateException.Flatten();
if (aggregateException.InnerExceptions?.Count == 1)
{
return aggregateException.InnerExceptions[0];
}
}
#endif
return exception;
}
object IFormatProvider.GetFormat(Type formatType)
{
return (formatType == typeof(ICustomFormatter)) ? this : null;
}
}
}