public async Task AddOrEditAnimalAsync(Animal animal)
{
//Check if animal has got an Id, and if so update it.
if (animal.AnimalId != 0)
{
//Check if animal exists loacally, and if it is detach it, so can update it.
Animal local = petShop.Set <Animal>().Local.FirstOrDefault(entry => entry.AnimalId.Equals(animal.AnimalId));
if (local != null)
{
// detach
petShop.Entry(local).State = EntityState.Detached;
}
// set Modified flag in your entry
petShop.Entry(animal).State = EntityState.Modified;
}
else
{
await petShop.Animals.AddAsync(animal);;
}
await petShop.SaveChangesAsync();
}