DefaultViewCache.cs

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

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

        public TCompiledView GetOrAdd<TCompiledView>(string viewLocationResult, Func<string, TCompiledView> valueFactory)
        {
            return (TCompiledView)this.cache.GetOrAdd(viewLocationResult, (k) => valueFactory(k));
        }
    }