/// <summary>
/// Completely rebuilds the database with new image data loaded from the given directory
/// A progress notifier can be supplied as this function my take a long time to execute
/// </summary>
/// <param name="dir">Directory to load images from</param>
/// <param name="notifyProgress">Function that is periodically called to signify progress don by this method</param>
/// <returns></returns>
public async Task UpdatePictureDataFromDirectory(string dir, Func <float, Task> notifyProgress = null)
{
Logger.Log(LogLevel.Information, "Requested rebuilding of Image Database with directory [%s]", new { dir });
var images = (await LoadImages(dir, notifyProgress)).ToList();
Logger.Log(LogLevel.Information, "Found %s valid image entries in directory [%s]", new { images.Count, dir });
await _picDb.RebuildPictureTable(images);
}