/// <summary>Converts the given value object to the specified destination type.</summary>
/// <param name="context">An <see cref="ITypeDescriptorContext"></see> that provides a format context.</param>
/// <param name="culture">An optional <see cref="CultureInfo"></see>. If not supplied, the current
/// culture is assumed.</param>
/// <param name="value">The <see cref="object"></see> to convert.</param>
/// <param name="destinationType">The <see cref="Type"></see> to convert the value to.</param>
/// <returns>An <see cref="object"></see> that represents the converted <paramref name="value">value</paramref>
/// </returns>
/// <exception cref="ArgumentNullException"><paramref name="destinationType">destinationType</paramref> is null.
/// </exception>
/// <exception cref="ArgumentException"><paramref name="value">value</paramref> is not a valid value
/// for the enumeration.</exception>
/// <exception cref="NotSupportedException">The conversion cannot be performed.</exception>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (value?.GetType().IsSubclassOf(typeof(EnumerationType)) == true && destinationType == typeof(string))
{
return(((EnumerationType)value).DisplayName);
}
return(value is string valueString && destinationType == typeof(string)
? ((EnumerationType)EnumerationType.FromDisplayName(EnumType, valueString)).DisplayName
: base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>Converts the specified value object to an enumeration object.</summary>
/// <param name="context">An <see cref="ITypeDescriptorContext"></see> that provides a format context.</param>
/// <param name="culture">An optional <see cref="CultureInfo"></see>. If not supplied, the current
/// culture is assumed.</param>
/// <param name="value">The <see cref="object"></see> to convert.</param>
/// <returns>An <see cref="object"></see> that represents the converted <paramref name="value">value</paramref>
/// .</returns>
/// <exception cref="FormatException"><paramref name="value">value</paramref> is not a valid value
/// for the target type.</exception>
/// <exception cref="NotSupportedException">The conversion cannot be performed.</exception>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string valueString)
{
return(EnumerationType.FromDisplayName(EnumType, valueString));
}
if (value?.GetType().IsSubclassOf(typeof(EnumerationType)) == true)
{
return((EnumerationType)value);
}
return(base.ConvertFrom(context, culture, value));
}
/// <summary>Initializes a new instance of the <see cref="EnumConverter"></see> class for the given type.</summary>
/// <param name="type">A <see cref="Type"></see> that represents the type of enumeration to associate
/// with this enumeration converter.</param>
public EnumerationTypeConverter(Type type) : base(type)
{
if (type is null)
{
throw new ArgumentNullException(nameof(type));
}
if (!type.IsSubclassOf(typeof(EnumerationType)))
{
throw new ArgumentException(ErrorMessageResources.EnumerationTypeDerivedClassExpected, nameof(type));
}
Values = new StandardValuesCollection(
(EnumerationType.GetAll(type).Cast <EnumerationType>())
.Select(s => s.DisplayName)
.ToList());
}
