摘要： Check dictionary value if it's emptydictionary.ElementAt(i).Value == DBNull.ValueCheck string valueif (String.IsNullOrWhiteSpace(mystring))equals to..if (mystring == null || mystring == String.Empty || mystring.Trim().Length == 0) earlier versionif (String.IsNullOrEmpty(mystring) || mystring.Tri 阅读全文