Attaching an entity of type 'X' failed because another entity of the same type already has the same primary key value

Question

ErrorMessage :

Attaching an entity of type \'FaridCRMData.Models.Customer\' failed because another entity of the same type already has the same prim

Answer 1

have you tried to mark your entity as modified BEFORE attach it to the context?

like this:

public bool Update(TEntity entity)
{
    var entry = context.Entry(entity);
    if (entry.State == EntityState.Detached || entry.State == EntityState.Modified)
    {
        entry.State = EntityState.Modified; //do it here

        context.Set().Attach(entity); //attach

        context.SaveChanges(); //save it
    }
    return true;
}