UsersCollection.cs

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using System;
using System.Configuration;

namespace AcUtils
{

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

        public UsersCollection() { }

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

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

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

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

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

        protected override object GetElementKey(ConfigurationElement element)
        {
            return (element as UserElement).User;
        }
    }
}