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LogLevelTypeConverter.cs
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LogLevelTypeConverter.cs
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//
// Copyright (c) 2004-2019 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.Attributes
{
using System;
using System.ComponentModel;
using System.Globalization;
/// <summary>
/// Support <see cref="NLog.LogLevel"/> implementation of <see cref="IConvertible"/>
/// </summary>
public class LogLevelTypeConverter : TypeConverter
{
/// <inheritdoc/>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
return sourceType == typeof(string) || IsNumericType(sourceType) || base.CanConvertFrom(context, sourceType);
}
/// <inheritdoc/>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value?.GetType() == typeof(string))
return LogLevel.FromString(value.ToString());
else if (IsNumericType(value?.GetType()))
return LogLevel.FromOrdinal(Convert.ToInt32(value));
else
return base.ConvertFrom(context, culture, value);
}
/// <inheritdoc/>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
return destinationType == typeof(string) || IsNumericType(destinationType) || base.CanConvertTo(context, destinationType);
}
/// <inheritdoc/>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (value is LogLevel logLevel)
{
if (destinationType == typeof(string))
return logLevel.ToString();
else if (IsNumericType(destinationType))
return Convert.ChangeType(logLevel.Ordinal, destinationType, culture);
}
return base.ConvertTo(context, culture, value, destinationType);
}
private static bool IsNumericType(Type sourceType)
{
return sourceType == typeof(int) ||
sourceType == typeof(uint) ||
sourceType == typeof(long) ||
sourceType == typeof(ulong) ||
sourceType == typeof(short) ||
sourceType == typeof(ushort);
}
}
}