FlickrNet.LockFile.Acquire C# (CSharp) Method

        public IDisposable Acquire()
        {
            string dir = Path.GetDirectoryName(filepath);

            lock (this)
            {
            #if !WindowsCE
                while (stream != null)
                    Monitor.Wait(this);
            #endif

                while (true)
                {
                    if (!Directory.Exists(dir))
                        Directory.CreateDirectory(dir);
                    try
                    {
                        Debug.Assert(stream == null, "Stream was not null--programmer error");
                        stream = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Read, FileShare.None, 8, false);
                        return disposeHelper;
                    }
                    catch (IOException ioe)
                    {
                        int errorCode = SafeNativeMethods.GetErrorCode(ioe);
                        switch (errorCode)
                        {
                            case 32:
                            case 33:
                            case 32 | 0x1620:
                            case 33 | 0x1620:
                                Thread.Sleep(50);
                                continue;
                            default:
                                throw;
                        }
                    }
                }
            }
        }

 /// <summary>
 /// Return all items in the cache.  Works similarly to
 /// ArrayList.ToArray(Type).
 /// </summary>
 public ICacheItem[] ToArray(Type valueType)
 {
     using (lockFile.Acquire())
     {
         Refresh();
         string[] keys;
         Array    values;
         InternalGetAll(valueType, out keys, out values);
         return((ICacheItem[])values);
     }
 }