MySql Exception: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE)

Unhandled Exception: MySql.Data.MySqlClient.MySqlException: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '=' --->

解决：

手动新建数据库：Character set(设定字符编码): utf8 -- UTF-8 Unicode

                             Collation 字符集 :  utf8_general_ci