public ImageDataCache()
: base()
{
dbName = "Raumwiese.db";
imageCache = new Dictionary<String, Image>();
imageCacheNew = new Dictionary<String, Image>();
imageCacheSmall = new Dictionary<String, Image>();
imageUrlOnRequest = new Dictionary<String, List<delegate_OnReqestImageDone>>();
this.webRequestHelper.denyRequestErrorLog = true;
}