Entity Framework EntityKey / Foreign Key problem.
- by Ronny176
Hi,
I keep getting the same error: Entities in 'VlaamseOverheidMeterEntities.ObjectMeter' participate in the 'FK_ObjectMeter_Meter' relationship. 0 related 'Meter' were found. 1 'Meter' is expected.
I have the following table structure:
Meter 1 <- * ObjectMeter * - 1 VO_Object
It is always the same scenario: The first meter is added to the database, the second meter gives the error above.
I have the following code in my manager:
public List<string> addTemporary(string username, string meterNaam, string readingType, string parentID) {
Meter meter = new Meter();
VO_Object voObject = objectManager.getObjectByID(parentID);
ObjectMeter objMeter = new ObjectMeter();
meter.readingType = (int)Enum.Parse(typeof(ReadingType), readingType);
meter.isActive = true;
meter.name = meterNaam;
meter.startDate = DateTime.Now;
meter.endDate = DateTime.Now.AddYears(6000);
meter.uniqueIdentifier = "N/A";
meter.meterType = (int)Enum.Parse(typeof(MeterType), "NA");
meter.meterCategory = (int)Enum.Parse(typeof(MeterCategory), "NA");
meter.energyType = (int)Enum.Parse(typeof(EnergyType), "NA");
meter.utilityType = (int)Enum.Parse(typeof(UtilityType), "NA");
meter.unitOfMeasure = (int)Enum.Parse(typeof(UnitOfMeasure), "NA");
objMeter.valid_from = meter.startDate;
objMeter.valid_until = meter.endDate;
objMeter.Meter = meter;
objMeter.VO_Object = voObject;
createMeter(meter);
List<String> str = new List<string>();
str.Add("" + meter.meterID);
str.Add(meter.name);
return str;
}
and this in my Dao Class which links to the database:
internal void CreateMeter(Meter _meter) {
_entities.AddToMeter(_meter);
_entities.SaveChanges();
}
Can someone please explain this error?
Ronald
