Cache XML Files

FileCacher.cs

class FileCacher
    {
        public Dictionary<string, byte[]> GetXmlFilesAsCache(IEnumerable<string> xmlFiles)
        {
            var cache = new Dictionary<string, byte[]>();

            foreach (var file in xmlFiles)
            {
                cache.Add(file, GetBytes(file));
            }
            return cache;
        }
        
        private static byte[] GetBytes(string filePath)
        {
            byte[] buffer = null;

            using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                buffer = new byte[file.Length];
                file.Read(buffer, 0, (int)file.Length);
            }
            return buffer;
        }
    }