Entity Framework Attach/Update confusion (EF Core)

Question

As I understand, when \"Update\" is called, every property within a specific entity is modified.

The \"Attach\" method, on the other hand, starts the entity off in the

Answer 1

Consider the following code:

students entity = new students() {
    Id = 1,
    City = "New York",
    Name = "Sam"
};
using(SomeContext ctx = new SomeContext())
{
    ctx.Entry(entity).State = EntityState.Modified;
    ctx.SaveChanges();
}

Assuming we have a record with id = 1 in the database, the above code will update that entity in the database.

Attach is used when you know that an entity already exists in the database but want to make some changes while change state to modified when you have already made the changes.