Entity Framework: “Store update, insert, or delete statement affected an unexpected number of rows (0).” [closed]

Answer 1

I also had this error. There are some situations where the Entity may not be aware of the actual Database Context you are using or the Model may be different. For this, set: EntityState.Modified; to EntityState.Added;

To do this:

if (ModelState.IsValid)
{
context.Entry(yourModelReference).State = EntityState.Added;
context.SaveChanges();
}

This will ensure the Entity knows youre using or adding the State youre working with. At this point all the correct Model Values need to be set. Careful not to loose any changes that may have been made in the background.

Hope this helps.