namespace System.Web.Mvc
{
    [DefaultMember("Item")]
    [Obsolete("The recommended alternative is to use one of the specific ValueProvider types, such as FormValueProvider.")]
    public class ValueProviderDictionary : ICollection<KeyValuePair<string, ValueProviderResult>>, IDictionary<string, ValueProviderResult>, IEnumerable, IEnumerable<KeyValuePair<string, ValueProviderResult>>, IValueProvider
    {
        public bool ContainsKey(string key);
    }
}