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

Answer 1

I got this error sporadically when using an async method. Has not happened since I switched to a synchronous method.

Errors sporadically:

[Authorize(Roles = "Admin")]
[HttpDelete]
[Route("file/{id}/{customerId}/")]
public async Task Delete(int id, int customerId)
{
    var file = new Models.File() { Id = id, CustomerId = customerId };
    db.Files.Attach(file);
    db.Files.Remove(file);

    await db.SaveChangesAsync();

    return Ok();
}

Works all the time:

[Authorize(Roles = "Admin")]
[HttpDelete]
[Route("file/{id}/{customerId}/")]
public IHttpActionResult Delete(int id, int customerId)
{
    var file = new Models.File() { Id = id, CustomerId = customerId };
    db.Files.Attach(file);
    db.Files.Remove(file);

    db.SaveChanges();

    return Ok();
}