// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Configuration.Provider;
 
namespace System.Configuration
{
    public class SettingsProviderCollection : ProviderCollection
    {
        public override void Add(ProviderBase provider)
        {
            if (provider is null)
            {
                throw new ArgumentNullException(nameof(provider));
            }
 
            if (!(provider is SettingsProvider))
            {
                throw new ArgumentException(SR.Format(SR.Config_provider_must_implement_type, typeof(SettingsProvider)), nameof(provider));
            }
 
            base.Add(provider);
        }
 
        public new SettingsProvider this[string name]
        {
            get
            {
                return (SettingsProvider)base[name];
            }
        }
    }
 
}