WebUtilityElement.cs

using System.ComponentModel;
using System.Configuration;
using System.Globalization;

namespace System.Net.Configuration
{
    public sealed class WebUtilityElement : ConfigurationElement
    {
        private class EnumTypeConverter<TEnum> : TypeConverter where TEnum : struct
        {
            public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
            {
                if (sourceType == typeof(string))
                {
                    return true;
                }
                return base.CanConvertFrom(context, sourceType);
            }

            public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
            {
                string text = value as string;
                if (text != null && Enum.TryParse(text, ignoreCase: true, out TEnum result))
                {
                    return result;
                }
                return base.ConvertFrom(context, culture, value);
            }
        }

        private readonly ConfigurationProperty unicodeDecodingConformance = new ConfigurationProperty("unicodeDecodingConformance", typeof(UnicodeDecodingConformance), UnicodeDecodingConformance.Auto, new EnumTypeConverter<UnicodeDecodingConformance>(), null, ConfigurationPropertyOptions.None);

        private readonly ConfigurationProperty unicodeEncodingConformance = new ConfigurationProperty("unicodeEncodingConformance", typeof(UnicodeEncodingConformance), UnicodeEncodingConformance.Auto, new EnumTypeConverter<UnicodeEncodingConformance>(), null, ConfigurationPropertyOptions.None);

        private readonly ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection();

        [ConfigurationProperty("unicodeDecodingConformance", DefaultValue = UnicodeDecodingConformance.Auto)]
        public UnicodeDecodingConformance UnicodeDecodingConformance
        {
            get
            {
                return (UnicodeDecodingConformance)base[unicodeDecodingConformance];
            }
            set
            {
                base[unicodeDecodingConformance] = value;
            }
        }

        [ConfigurationProperty("unicodeEncodingConformance", DefaultValue = UnicodeEncodingConformance.Auto)]
        public UnicodeEncodingConformance UnicodeEncodingConformance
        {
            get
            {
                return (UnicodeEncodingConformance)base[unicodeEncodingConformance];
            }
            set
            {
                base[unicodeEncodingConformance] = value;
            }
        }

        protected internal override ConfigurationPropertyCollection Properties
        {
            protected get
            {
                return properties;
            }
        }

        public WebUtilityElement()
        {
            properties.Add(unicodeDecodingConformance);
            properties.Add(unicodeEncodingConformance);
        }
    }
}