Generic LINQ Extension

GenericCollectionExtensions.cs

namespace __NAMESPACE__
{
    using System.Linq;
    using System.Collections.Generic;

    /// <summary>
    /// Check if expected list items are all in master list
    /// </summary>
    /// <typeparam name="T">Generic Type</typeparam>
    /// <param name="a">Master list</param>
    /// <param name="b">Expected list items</param>
    /// <returns>true if all items in b are in a</returns>
    public static class GenericCollectionExtensions
    {
        public static bool ContainsAll<T>(this List<T> a, List<T> b)
        {
            return !b.Except(a).Any();
        }
    }
}