What Wrong With This EF Code First Model..?

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This Is The Exception Em Recieving.
"The property 'MeterID' cannot be configured as a navigation property. The property must be a valid entity type and the property should have a non-abstract getter and setter. For collection properties the type must implement ICollection<t> where T is a valid entity type"

C#

public class Employee
{
    public int EmployeeID { get; set; }
    public String FirstName { get; set; }
    public String LastName { get; set; }
    public float Salary { get; set; }
    public int Age { get; set; }
    public String MobileNo { get; set; }
    public String Designation { get; set; }

    [ForeignKey("QuaterID")]
    public int QuaterID { get; set; }
    public DomesticQuater Quater { get; set; }


}

public class DomesticQuater
{
    public int ID { get; set; }
    public Int64 QuaterNo { get; set; }
    public String QuaterType { get; set; }
    public int Block { get; set; }
    public String Area { get; set; }
    public String Street { get; set; }
    public String AddtionalAddress { get; set; }

    [ForeignKey("MeterID")]
    public int MeterID { get; set; }
    public virtual ElectricMeter Meter { get; set; }

}

public class ElectricMeter
{
    public int MeterID { get; set; }
    public int MeterNo   { get; set; }
    public DateTime InstalledDate { get; set; }
    [Column("MeterType")]
    public bool IsDomestic { get; set; }

}

[Table("CommercialConsumers")]
public class CommercialShop
{
    public int ID { get; set; }
    public Int64 OwnerNIC { get; set; }
    public string OwnerName { get; set; }
    public String Block { get; set; }
    public String Area { get; set; }
    public String Street { get; set; }
    public String AddtionalAddress { get; set; }

    [ForeignKey("MeterID")]
    public int MeterID { get; set; }
    public virtual ElectricMeter Meter { get; set; }

}


public class DemoBillingContext : DbContext
{


    public virtual DbSet<Employee> Employees { get; set; }
    public virtual DbSet<ElectricMeter> Meters { get; set; }
    public virtual DbSet<DomesticQuater> Quaters { get; set; }
    public virtual DbSet< CommercialShop>CommercialConsumers { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
                base.OnModelCreating(modelBuilder);
    }
}

Here In Page Load Em Trying To put Some Data..

C#

protected void Page_Load(object sender, EventArgs e)
        {


            DemoBillingContext context = new DemoBillingContext();

            //context.Meters.Add()
            ElectricMeter m = new ElectricMeter()
                                {
                                    MeterNo = 56589255,
                                    IsDomestic = true,
                                    InstalledDate = DateTime.Now
                                };
            DomesticQuater q = new DomesticQuater()
                {
                    QuaterNo = 563,
                    Area = "Loco",
                    Block = 3,
                    QuaterType = "OfficerQuater",
                    Street = "45",
                    MeterID = 1,AddtionalAddress="LOCO FACTROY 1 STREET 1 HOUSE 23/43",

                };
            Employee emp = new Employee
            {


                FirstName = "ARIF",
                LastName = "HUSSAIN",
                MobileNo = "03475060769",
                Designation = "Manager",
                Salary = 50000,
                QuaterID = 1,

            };

            context.Employees.Add(emp);

            foreach (var item in context.Employees)
            {

                Domestic.Text += String.Format("{0}---{1}---{2}---{3}--{4}",item.FirstName+" "+item.LastName,
                    item.Salary,
                    item.Quater.QuaterNo,
                    item.Quater.Area,
                    item.Quater.Meter.MeterNo,
                    item.Quater.Meter.IsDomestic);
                
            }
      


        }

Posted 3-Mar-15 6:40am

Arif H Shigri

Updated 3-Mar-15 6:42am

v2

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dave Kreskowiak · Accepted Answer · 2015-03-03T07:00:00

It appears that your class should look like this:

public class DomesticQuater
    {
        public int ID { get; set; }
        public Int64 QuaterNo { get; set; }
        public String QuaterType { get; set; }
        public int Block { get; set; }
        public String Area { get; set; }
        public String Street { get; set; }
        public String AddtionalAddress { get; set; }
 
        public virtual ElectricMeter Meter { get; set; }
    }

You don't need the "int MeterId" line at all. EF will put it in there for you. You have the same problem in your CommercialShop and Employee classes.

Your ElectricMeter class also has a problem. The ID column name should be the name of the class with "Id" appended to it for a conventional configuration:

public class ElectricMeter
    {
        public int ElectricMeterID { get; set; }
        public int MeterNo { get; set; }
        public DateTime InstalledDate { get; set; }
        [Column("MeterType")]
        public bool IsDomestic { get; set; }
 
    }

OR you can explicitly tag it as the key to the table, but just make sure you don't get MeterId and MeterNo confused in your code.

public class ElectricMeter
    {
        [Key]
        public int MeterID { get; set; }
        public int MeterNo   { get; set; }
        public DateTime InstalledDate { get; set; }
        [Column("MeterType")]
        public bool IsDomestic { get; set; }
 
    }

What Wrong With This EF Code First Model..?

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What Wrong With This EF Code First Model..?

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