subsonic 3 - 'System.Byte []'类型的对象无法转换为'System.String'类型

I have this piece of code that works fine in subsonic 2.2, I migrated to subsonic 3 but now i get this error 'Object of type 'System.Byte[]' cannot be converted to type 'System.String'.' subsonic 2.2 code in commentI have this piece of code that works fine in su