刚刚学习.net core2，用dapper+mysql操作数据库，但是一直连不上去，提示“ArgumentException: Format of the initialization string does not conform to specification starting at index 0.”，不知道什么原因，只配置了appseting.json：，后台代码是这样写的：

 "ConnectionStrings": {
    "DefaultConnection": "server=locahostl;post=3306;database=blog;user=root;password=123456"
  },

 public static MySqlConnection GetConnection()
        {
            using (MySqlConnection conn = new MySqlConnection("DefaultConnection"))
            {
                conn.Open();
                return conn;
            }
        }