public ActionResult UpdateOrderTime() { using (var db = new ShiJieBeiDbContext()) { // 批量更新 Random random = new Random(); var entitys = db.GameOrders; entitys.ToList().ForEach(item => { int day = random.Next(14, 20); int hour = random.Next(0, 24); int minute = random.Next(0, 60); int second = random.Next(0, 60); string tempStr = $"{DateTime.Now:yyyy}-{DateTime.Now:MM}-{day} {hour}:{minute}:{second}"; DateTime rTime = Convert.ToDateTime(tempStr); item.CreateTime = rTime; }); db.SaveChanges(); } //foreach (var item in _db.GameOrders) //{ // Random random = new Random(); // int day = random.Next(14, 20); // int hour = random.Next(0, 24); // int minute = random.Next(0, 60); // int second = random.Next(0, 60); // string tempStr = string.Format("{0}-{1}-{2} {3}:{4}:{5}", DateTime.Now.ToString("yyyy"),DateTime.Now.ToString("MM"), day, hour, minute, second); // DateTime rTime = Convert.ToDateTime(tempStr); // item.CreateTime = rTime; // _db.Entry(item).State = System.Data.Entity.EntityState.Modified; //} //_db.SaveChanges(); return(Content($"{DateTime.Now}更新时间成功")); }