BlueCollar.Dashboard.StaticFile.GetHash C# (CSharp) Метод

        public static string GetHash(string name)
        {
            if (string.IsNullOrEmpty(name))
            {
                throw new ArgumentNullException("name", "name must contain a value.");
            }

            string key = string.Concat("BlueCollar.Dashboard.StaticFileHandler.Hash.", name).ToUpperInvariant();
            string hash = HttpRuntime.Cache[key] as string;

            if (string.IsNullOrEmpty(hash))
            {
                StringBuilder hex = new StringBuilder();
                byte[] buffer;

                using (MD5 hasher = MD5.Create())
                {
                    buffer = hasher.ComputeHash(GetContents(name));
                }

                foreach (byte b in buffer)
                {
                    hex.Append(b.ToString("X2", CultureInfo.InvariantCulture));
                }

                hash = hex.ToString().ToLowerInvariant();

                HttpRuntime.Cache.Add(
                    key,
                    hash,
                    null,
                    Cache.NoAbsoluteExpiration,
                    Cache.NoSlidingExpiration,
                    CacheItemPriority.Normal,
                    null);
            }

            return hash;
        }