從我的asp.net數據庫

Question

如何刪除項目我想了asp.net和我被難倒System.Data.Entity.Infrastructure.DbUpdateConcurrencyException。我嘗試在'刪除'操作方法中保存對數據庫的更改時發生異常。

這裏是我的編輯方法的代碼，這工作完全正常：

 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"); 
     } 

---

這裏是不爲我的刪除方法的代碼！

 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"); 
    }