FlickrNet.PersistentCache.Refresh C# (CSharp) Method

        private void Refresh()
        {
            Debug.Assert(!dirty, "Refreshing even though cache is dirty");

            DateTime newTimestamp = DateTime.MinValue;
            long newLength = -1;
            if (dataFile.Exists)
            {
                dataFile.Refresh();
                newTimestamp = dataFile.LastWriteTime;
                newLength = dataFile.Length;
            }

            if (timestamp != newTimestamp || length != newLength)
            {
                // file changed
                if (!dataFile.Exists)
                    dataTable.Clear();
                else
                {
                    Debug.WriteLine("Loading cache from disk");
                    using (FileStream inStream = dataFile.Open(FileMode.Open, FileAccess.Read, FileShare.Read))
                    {
                        dataTable = Load(inStream);
                    }
                }
            }

            timestamp = newTimestamp;
            length = newLength;
            dirty = false;
        }