无法使用 SaveChanges() 更新数据库

Question

Context.SaveChanges() 没有更新数据库。我了解附加或分离对象可能存在一些问题，但我无法弄清楚。这里可能出了什么问题？

        public ActionResult DeleteSupplier(int supplierId)
        {
            using (var db = new InventoryDbContext())
            {
                Suppliers ss = (from s in db.supplier
                                             where s.supplierId == supplierId
                                             select s).FirstOrDefault();
                db.supplier.Remove(ss);
                db.Entry(ss).State = EntityState.Deleted;
                db.SaveChanges();
            }

            return new EmptyResult();
        }

jQuery/ajax 代码：

//Delete event handler.
            $("body").on("click", "#tblss .Delete", function () {
                if (confirm("Do you want to delete this row?")) {
                    var row = $(this).closest("tr");
                    var supplierId = row.find("span").html();
                    $.ajax({
                        type: "POST",
                        url: "/Master/DeleteSupplier",
                        data: '{supplierId: ' + supplierId + '}',
                        contentType: "application/json; charset=utf-8",
                        dataType: "json",
                        success: function (response) {
                            if ($("#tblss tr").length > 2) {
                                row.remove();
                            } else {
                                row.find(".Edit").hide();
                                row.find(".Delete").hide();
                                row.find("span").html(' ');
                            }
                        }
                    });
                }
            });

Answer 1

终于弄明白了。它与 View 页面有关，其中 javascript 从 span 读取 Id，但 html 页面中省略了语法。