Create object from existing object Entity framework c#

Question

I want to copy full information of record to another in EF C#:

List<Cohort> AnYearsCohorts = oDB.Cohorts.Where(x=>x.Year == oCh.Year).ToList();
foreach (Cohort ochort in AnYearsCohorts)
{
    Cohort nChort = new Cohort();
    nChort = ochort;
    nChort.Year = Year;
    nChort.ID = 0;
    oDB.Cohorts.Add(nChort);
}
oDB.SaveChanges();

But got following error:

{"The property 'ID' is part of the object's key information and cannot be modified. "}

just remove this line: nChort.ID = 0;

jpgrassi
– jpgrassi

2017-06-15 12:42:03 +00:00
Commented Jun 15, 2017 at 12:42 — jpgrassi
– jpgrassi, Commented Jun 15, 2017 at 12:42

Jaimin Dave · Accepted Answer · 2017-06-15 06:48:41Z

3

You probably have set ID as primary key and auto incremented so you can not change ID field explicitly in code. Either remove ID as key or let ID increment automatically.

answered Jun 15, 2017 at 6:48

Jaimin Dave

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