/// <summary>
        /// Creates a file in this folder
        /// </summary>
        /// <param name="desiredName">The name of the file to create</param>
        /// <param name="option">Specifies how to behave if the specified file already exists</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>The newly created file</returns>
        public async Task<IFile> CreateFileAsync(string desiredName, CreationCollisionOption option, CancellationToken cancellationToken)
        {
            Requires.NotNullOrEmpty(desiredName, "desiredName");

            await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);
            EnsureExists();

            string nameToUse = desiredName;
            string newPath = System.IO.Path.Combine(Path, nameToUse);
            if (File.Exists(newPath))
            {
                if (option == CreationCollisionOption.GenerateUniqueName)
                {
                    string desiredRoot = System.IO.Path.GetFileNameWithoutExtension(desiredName);
                    string desiredExtension = System.IO.Path.GetExtension(desiredName);
                    for (int num = 2; File.Exists(newPath); num++)
                    {
                        cancellationToken.ThrowIfCancellationRequested();
                        nameToUse = desiredRoot + " (" + num + ")" + desiredExtension;
                        newPath = System.IO.Path.Combine(Path, nameToUse);
                    }
                    InternalCreateFile(newPath);
                }
                else if (option == CreationCollisionOption.ReplaceExisting)
                {
                    File.Delete(newPath);
                    InternalCreateFile(newPath);
                }
                else if (option == CreationCollisionOption.FailIfExists)
                {
                    throw new IOException("File already exists: " + newPath);
                }
                else if (option == CreationCollisionOption.OpenIfExists)
                {
                    //	No operation
                }
                else
                {
                    throw new ArgumentException("Unrecognized CreationCollisionOption: " + option);
                }
            }
            else
            {
                //	Create file
                InternalCreateFile(newPath);
            }

            var ret = new FileSystemFile(newPath);
            return ret;
        }
        /// <summary>
        /// Gets a file in this folder
        /// </summary>
        /// <param name="name">The name of the file to get</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>The requested file, or null if it does not exist</returns>
        public async Task<IFile> GetFileAsync(string name, CancellationToken cancellationToken)
        {
            await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);

            string path = System.IO.Path.Combine(Path, name);
            if (!File.Exists(path))
            {
                throw new PCLStorage.Exceptions.FileNotFoundException("File does not exist: " + path);
            }
            var ret = new FileSystemFile(path);
            return ret;
        }