Store update, insert, or delete statement affected an unexpected number of rows ({0}). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.
存储区更新、插入或删除语句影响到了意外的行数({0})。实体在加载后可能被修改或删除。刷新 ObjectStateManager 项。
如下ASP.NET MVC 范例代码，使用Entity Framework 来更新数据记录。
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[HttpPost]public ActionResult Edit(Album album){if(ModelState.IsValid){storeDB.Entry(album).State = EntityState.Modified;storeDB.SaveChanges();return RedirectToAction("Index");}ViewBag.Genres = new SelectList(storeDB.Genres, "GenreId", "Name", album.GenreId);ViewBag.Artists = new SelectList(storeDB.Artists, "ArtistId", "Name", album.ArtistId);return View(album);} |
出现上述异常的原因，一般是由于Model 或 Entity 实体对象的Key 值没有赋值，无法在数据库对应表中找到对应的记录，也就无法执行更新操作。
解决办法是在View 视图中，添加一个隐藏的Key值，如下所示：
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@Html.HiddenFor(model => model.AlbumId) |
摘自 http://www.entlib.net/?p=136
