How to Update only single field using EF

Question

This is the current basic code :

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Edit(Registration registration)
    {
        if (Mode         


        

Answer 1

Attach it to the context in the Unchanged state, and only set Date as modified.

if (ModelState.IsValid)
{
    db.Registrations.Attach(registration); // attach in the Unchanged state
    db.Entry(registration).Property(r => r.Date).IsModified = true;
    // Date field is set to Modified (entity is now Modified as well)
    db.SaveChanges();
    return RedirectToAction("Index");
}

You said the incoming entity only has Date filled in, hopefully there's an Id too. :)