Question

我刚刚开始涉足EF，我正试图绕过它（通常很容易）。但是由于某种原因，它实际上并没有保存结果，虽然它似乎可以缓存一段时间的值，然后回滚到之前的值？

using (IAPlayerEntities IAPE = new IAPlayerEntities()) {
                ObjectSet<Player> Players = IAPE.Players;
                if (Players.Count() > 0) {
                    Player currentPlayer = new Player();
                    bool LoggedIn = false;
                    Players.DefaultIfEmpty(null);
                    while (!LoggedIn) {
                        Console.WriteLine("Please enter your Username:");
                        string username = Console.ReadLine();
                        Console.WriteLine("Please enter your Password:");
                        string password = MaskLine();
                        currentPlayer = Players.FirstOrDefault(r => r.Password == password && r.Name == username);
                        LoggedIn = (currentPlayer != null);
                        if (!LoggedIn) {
                            Console.WriteLine("{0}Invalid combination, please try again.", Environment.NewLine);
                        }
                    }
                    Console.WriteLine("{0}Please choose your colony.", Environment.NewLine);
                    foreach (Colony col in currentPlayer.Colonies) {
                        Console.WriteLine(@"{0}{1}:{0}{2}{0}Level {3}", Environment.NewLine, col.ID, col.Name, col.Level);
                    }
                    Console.WriteLine();
                    int colID = -1;
                    string colStr = Console.ReadLine();
                    while (!int.TryParse(colStr, out colID) || !currentPlayer.Colonies.Any(e => e.ID == colID)) {
                        if (colStr.ToLower() == "q") {
                            Console.WriteLine("Goodbye!");
                            return;
                        }
                        Console.WriteLine("{0}Invalid Colony. Please try again.", Environment.NewLine);
                        colStr = Console.ReadLine();
                    }
                    Console.WriteLine("Please enter a new name for the colony:");
                    string colName = Console.ReadLine();
                    bool b = IAPE.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Deleted | EntityState.Modified).Any();
                    currentPlayer.Colonies.First(e => e.ID == colID).Name = colName;
                    int change = IAPE.SaveChanges();
                    if (change >= 1) {
                        Console.WriteLine("{0}Colony has been renamed.", Environment.NewLine);
                    } else {
                        Console.WriteLine("{0}Colony could not be renamed.", Environment.NewLine);
                    }
                } else {
                    Console.WriteLine("No Registered users");
                }
            }

忽略über安全登录，只有在那里才能从中获取一个玩家实体进行测试。

在保存之前将bool b设置为true，然后如果我使用调试器在“立即窗口”窗格中运行相同的行，则它显示为false。对我来说，意味着它得救？如果我在应用程序关闭后重新运行应用程序，那么更改的值就会到位。但最终它将返回到之前的值，如果我在显示原始名称后直接检查数据库，那么我不太确定这里发生了什么？

它在VCS2010上运行，因此框架4。

谢谢，Psy

Answer 1

检查SQL转到数据库，经过一些调查后发现我在项目中有一个数据库副本，每次我重建它时都会覆盖输出中的数据库。 / p>

Answer 2

IAPE.Savechanges（）在某些时候。

实体框架实际上没有保存更改

2 个答案: