Store update, insert, or delete statement affected an unexpected number of rows (0) EntityFramework [duplicate]

Answer 1

Figured it out. The problem was that there's two of us working on this project, and my colleague created his own instance of DBContext he was updating one and i the other. So for who ever has this problem in the future make sure you don't have two different instances of your DBContext at the same time

Answer 2

I came across this when googleing. I had the same error message but the reason turned out to be that i did not set some mandatory non null values.

Maybe this finding helps someone.

Answer 3

For me the problem was that i didn't had set the action bindings correctly:

public ActionResult Edit([Bind(Include = "VehicleID,Name,CreateDate,PowerPS,DrivenKM")] Car car)
    { ... }

The VehicleID was mapped with the wrong identifier, therefore Entity Framework always got 0 as primary key.

Answer 4

Your exception means that between time when you fetched data from database and modified it ,Your data had been changed.

By default, the Entity Framework implements an optimistic concurrency model. This means that locks are not held on data in the data source between when the data is queried and the data is updated. MSDN

how to manage concurrency in an object context.MSDN

Or follow this answer which refreshes context. StackOverflow

Answer 5

I fixed some code that was giving the same error message when trying to update a record. I had the following code initially:

[HttpPost]
    public ActionResult Edit(Project project)
    {
        if (ModelState.IsValid)
        {

            entity.Entry(project).State = EntityState.Modified;
            entity.SaveChanges();

            return RedirectToAction("Index", "Home");
        }
        return View(project);
    }

Instead of the following code

   [HttpPost]
    public ActionResult Edit(Project project)
    {
        if (ModelState.IsValid)
        {

            entity.Entry(project).State = EntityState.Added;
            entity.SaveChanges();

            return RedirectToAction("Index", "Home");
        }
        return View(project);
    }

Answer 6

Make sure you are passing the ID for both tables to the model from the view. In your case it's the key for the table Person and UserProfile. If you dont need to show the ID on the page you can add @Html.HiddenFor(model => model.PersonId) and @Html.HiddenFor(model => model.UserProfileId)