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LogLevelTypeConverter.cs
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LogLevelTypeConverter.cs
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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 IsSupportedType(sourceType) || base.CanConvertFrom(context, sourceType);
}
/// <inheritdoc/>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
TypeCode casted = Convert.GetTypeCode(value);
switch (casted)
{
case TypeCode.String:
return LogLevel.FromString(value.ToString());
case TypeCode.Int16:
return LogLevel.FromOrdinal(Convert.ToInt16(value));
case TypeCode.UInt16:
return LogLevel.FromOrdinal(Convert.ToUInt16(value));
case TypeCode.Int32:
return LogLevel.FromOrdinal(Convert.ToInt32(value));
case TypeCode.UInt32:
return LogLevel.FromOrdinal((int)Convert.ToUInt32(value));
case TypeCode.Int64:
return LogLevel.FromOrdinal((int)Convert.ToInt64(value));
case TypeCode.UInt64:
return LogLevel.FromOrdinal((int)Convert.ToUInt64(value));
default:
return base.ConvertFrom(context, culture, value);
}
}
/// <inheritdoc/>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
return IsSupportedType(destinationType) || base.CanConvertTo(context, destinationType);
}
/// <inheritdoc/>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
var casted = value as LogLevel;
return destinationType == typeof(string) && casted != null
? casted.ToString()
: base.ConvertTo(context, culture, casted?.Ordinal ?? value, destinationType);
}
private static bool IsSupportedType(Type sourceType)
{
return sourceType == typeof(string) ||
sourceType == typeof(short) ||
sourceType == typeof(ushort) ||
sourceType == typeof(int) ||
sourceType == typeof(uint) ||
sourceType == typeof(long) ||
sourceType == typeof(ulong);
}
}
}