IdnElement.cs

using System.ComponentModel;
using System.Globalization;

namespace System.Configuration
{
    public sealed class IdnElement : ConfigurationElement
    {
        private class UriIdnScopeTypeConverter : TypeConverter
        {
            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)
                {
                    switch (text.ToLower(CultureInfo.InvariantCulture))
                    {
                    case "all":
                        return UriIdnScope.All;
                    case "none":
                        return UriIdnScope.None;
                    case "allexceptintranet":
                        return UriIdnScope.AllExceptIntranet;
                    }
                }
                return base.ConvertFrom(context, culture, value);
            }
        }

        internal const UriIdnScope EnabledDefaultValue = UriIdnScope.None;

        private ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection();

        private readonly ConfigurationProperty enabled = new ConfigurationProperty("enabled", typeof(UriIdnScope), UriIdnScope.None, new UriIdnScopeTypeConverter(), null, ConfigurationPropertyOptions.None);

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

        [ConfigurationProperty("enabled", DefaultValue = UriIdnScope.None)]
        public UriIdnScope Enabled
        {
            get
            {
                return (UriIdnScope)base[enabled];
            }
            set
            {
                base[enabled] = value;
            }
        }

        public IdnElement()
        {
            properties.Add(enabled);
        }
    }
}