DataTable问题

Question

  public class InnovationSubmission
    {
        public OleDbConnection connectr = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=DatabaseTEST.accdr;Jet OLEDB:Database Password=DWPOIT");
        public OleDbDataAdapter Adaptor = new OleDbDataAdapter();



        private List<SelectListItem> _Area = new List<SelectListItem>();
        private List<SelectListItem> _Team = new List<SelectListItem>();


        public int ID { get; set; }
        [Required(ErrorMessage="Please enter a short description")]
        public string ShortDescription { get; set; }
        [Required(ErrorMessage = "Please enter a detailed description")]
        public string DetailedDescription { get; set; }
        public string Status { get; set; }

        [Required(ErrorMessage = "Please enter your name")]
        public string Originator { get; set; }

        [Required(ErrorMessage = "Please enter your email address")]
        [RegularExpression(".+\\@.+\\..+",
        ErrorMessage = "Please enter a valid email address")]
        public string OriginatorEmail { get; set; }
        [Required]
        public string SelectedArea { get; set; }
        [Required]
        public string SelectedTeam { get; set; }


        public List<SelectListItem> Area
        {
            get { return _Area; }
        }

        public List<SelectListItem> Teams
        {
            get 
            {

                string SQLSelect = ("SELECT * FROM Teams");
                OleDbCommand sCommand = new OleDbCommand(SQLSelect, connectr);
                Adaptor.SelectCommand = sCommand;


                connectr.Open();
                Adaptor.Fill(areaTable);
                connectr.Dispose();

                foreach (DataRow row in areaTable.Rows)
                {
                    _Team.Add(new SelectListItem() { Text = row[1].ToString(), Value = row[1].ToString() });

                }

                return _Team;
            }
        }

        public DataTable areaTable = new DataTable();


        }
}

Answer 1

对我来说，看起来你的连接器对象有问题。可能它在其他地方使用，这就是你得到例外的原因。打开新连接，执行查询并关闭它。尝试使用using在使用块中实现该目标并进行查询。

另外，正如评论中已经提到的那样 - 在属性getter中进行db查询并不是一个好主意。看起来很奇怪和hacky ......

Answer 2

如果我像这样使用它就可以了！

 public List<SelectListItem> Teams
        {
            get 
            {

                string SQLSelect = ("SELECT * FROM Teams");
                OleDbCommand sCommand = new OleDbCommand(SQLSelect, connector);
                Adaptor.SelectCommand = sCommand;


                connector.Open();
                Adaptor.Fill(areaTable);
                connector.Dispose();

                foreach (DataRow row in areaTable.Rows)
                {
                    _Team.Add(new SelectListItem() { Text = row[1].ToString(), Value = row[1].ToString() });

                }

                return _Team;
            }
        }