//------------------------------------------------------------------------------
// <copyright file="SettingsProviderCollection.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//------------------------------------------------------------------------------

namespace System.Configuration {
    using  System.Collections.Specialized;
    using  System.Runtime.Serialization;
    using  System.Configuration.Provider;

   ////////////////////////////////////////////////////////////
   ////////////////////////////////////////////////////////////
   ////////////////////////////////////////////////////////////
   public class SettingsProviderCollection : ProviderCollection
   {
       public override void Add(ProviderBase provider) {
           if( provider == null )
           {
               throw new ArgumentNullException( "provider" );
           }

           if( !( provider is SettingsProvider ) )
           {
                throw new ArgumentException(SR.GetString(SR.Config_provider_must_implement_type, typeof(SettingsProvider).ToString()), "provider");
           }
 
           base.Add( provider );
       }

       new public SettingsProvider this[string name] {
           get {
               return (SettingsProvider) base[name];
           }
       }
   }
}