如何从我的 asp.net 数据库中删除项目

Question

我正在试用 asp.net，但我被 System.Data.Entity.Infrastructure.DbUpdateConcurrencyException 难住了。异常发生在我尝试在“删除”操作方法中将更改保存到我的数据库的行。

这是我的编辑方法代码，效果很好：

        public ActionResult Edit(int id)
        {
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

        [HttpPost]
        public ActionResult Edit(Movie movie)
        {
                db.Entry(movie).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
        }

---

这是我的删除方法的代码，它没有！

        public ActionResult Delete(int id)
        {
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

        [HttpPost]
        public ActionResult Delete(Movie movie)
        {
            db.Movies.Attach(movie);
            db.Movies.Remove(movie);
            //db.Entry(movie).State = System.Data.Entity.EntityState.Deleted;
            //both the outcommented line above and the current method of marking for deletion result in the same exception on the line below.
            db.SaveChanges();
            return RedirectToAction("Index");
        }

Answer 1

    [HttpPost]
    public ActionResult Delete(Movie movie)
    {
        var dbMovie = db.Movies.find(movie.id);
        db.Movies.Remove(dbMovie);
        db.SaveChanges();
        return RedirectToAction("Index");
    }