DefaultViewCache.cs

    public class DefaultViewCache : IViewCache
    {
        private readonly ConcurrentDictionary<ViewLocationResult, object> cache;

        public DefaultViewCache()
        {
            this.cache = new ConcurrentDictionary<ViewLocationResult, object>();
        }

        public TCompiledView GetOrAdd<TCompiledView>(ViewLocationResult viewLocationResult, Func<ViewLocationResult, TCompiledView> valueFactory)
        {
            object result;

            if (!this.cache.TryGetValue(viewLocationResult, out result))
            {
                result = valueFactory.Invoke(viewLocationResult);
                this.cache.GetOrAdd(viewLocationResult, result);
            }

            return (TCompiledView)result;
        }
    }