GroupsCollection.cs

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using System;
using System.Configuration;

namespace AcUtils
{

    [ConfigurationCollection(typeof(GroupElement),
        CollectionType=ConfigurationElementCollectionType.AddRemoveClearMap)]
    [Serializable]
    public sealed class GroupsCollection : ConfigurationElementCollection
    {
        private static ConfigurationPropertyCollection _properties;
        static GroupsCollection()
        {
            _properties = new ConfigurationPropertyCollection();
        }

        public GroupsCollection() { }

        protected override ConfigurationPropertyCollection Properties
        {
            get { return _properties; }
        }

        public override ConfigurationElementCollectionType CollectionType
        {
            get { return ConfigurationElementCollectionType.AddRemoveClearMap; }
        }

        public GroupElement this[int index]
        {
            get { return (GroupElement)base.BaseGet(index); }
            set
            {
                if (base.BaseGet(index) != null)
                {
                    base.BaseRemoveAt(index);
                }
                base.BaseAdd(index, value);
            }
        }

        new public GroupElement this[string key]
        {
            get { return (GroupElement)BaseGet(key); }
        }

        protected override ConfigurationElement CreateNewElement()
        {
            return new GroupElement();
        }

        protected override object GetElementKey(ConfigurationElement element)
        {
            return (element as GroupElement).Group;
        }
    }
}