Question

大家好，我正在尝试连接到我的数据库并插入新的患者信息。当我运行我的应用程序时，我得到“无效的参数大小值-1。该值必须大于或等于0。参数名称：值“请帮忙无法弄清楚参数的设置位置。谢谢

   using System.Collections.Generic;
   using System.Data.Linq;
   using System.Windows.Forms;
   using iAnywhere.Data.SQLAnywhere;

   namespace...     
   public class PatientService
       {
        private const string ConnectionString = "Dsn=SQL Anywhere
                                  10;uid=DBA;PWD=sql;databasefile='C:\\Users\\Public\\Documents\\SQL Anywhere 10\\Samples\\Training1.db';";

        public void CreatePatientInfo(Patient patient)
            {
             DataContext patientDataContext = new DataContext(Conn);

             Conn.Open();

             Table<Patient> patientsTableList = patientDataContext.GetTable<Patient>();

             patientsTableList.InsertOnSubmit(patient);


             patientDataContext.SubmitChanges();
             Conn.Close();
            }
       }

具有映射属性的My Patient类

    using System.Data.Linq.Mapping;

    namespace ...
    {
     [Table(Name = "patient")]
     public class Patient
    {
    public Patient()
    {
    }

    public Patient(string patientId, string firstName, string lastName, string address, string city, string state,
        string zipcode, string phoneNumber, string notes, int classificationId)
    {
        PatientId = patientId;
        FirstName = firstName;
        LastName = lastName;
        Address = address;
        City = city;
        State = state;
        Zipcode = zipcode;
        PhoneNumber = phoneNumber;
        Notes = notes;
        ClassificationID = classificationId;
    }

    [Column(Name = "patient_id", DbType = "char(5) NOT NULL", CanBeNull = false,
        IsPrimaryKey = true)]
    public string PatientId { get; set; }

    [Column(Name = "first_name", DbType = "char(40)", CanBeNull = false)]
    public string FirstName { get; set; }

    [Column(Name = "lastname", DbType = "char(40)", CanBeNull = false)]
    public string LastName { get; set; }

    [Column( Name = "address", DbType = "char(40)", CanBeNull = true)]
    public string Address { get; set; }

    [Column( Name = "city", DbType = "char(40)", CanBeNull = true)]
    public string City { get; set; }

    [Column( Name = "state", DbType = "char(2)", CanBeNull = true)]
    public string State { get; set; }

    [Column( Name = "zipcode", DbType = "char(9)", CanBeNull = true)]
    public string Zipcode { get; set; }

    [Column(Name = "phone", DbType = "char(10)", CanBeNull = true)]
    public string PhoneNumber { get; set; }

    [Column( Name = "notes", DbType = "varchar", CanBeNull = true)]
    public string Notes { get; set; }

    [Column( Name = "classification_id", DbType = "int", CanBeNull = true)]
    public int ClassificationID { get; set; }
}

}

Answer 1

下面

[Column( Name = "notes", DbType = "varchar", CanBeNull = true)]

应该是

[Column( Name = "notes", DbType = "varchar(250)", CanBeNull = true)]

某些值（我使用250）

参数大小值无效-1

1 个答案: