标签：style blog color 使用 os io for 问题
上一篇针对用户注册案例简单介绍了如何使用 DDD，接下来我将继续针对这个例子做一下补充。先将User模型丰富起来，因为目前看上去他和贫血模型还没有啥大的区别。
首先还是由领域专家来说明业务，他由提出了用户注册成功后需要完善个人信息，这些信息包括姓名、生日、手机号。还需要用户提供一些联系信息，如果地址，邮编等。那么我们就可以根据业务定义方法了。昨天netfocus兄指正了loginid所产生的歧义，表示认为，所以今天一并修改了一下。
public class AddressInfo { public AddressInfo(string province, string city, string address, string postcode) { this.Province = province; this.City = city; this.Address = address; this.Postcode = postcode; } public string Province { get; private set; } public string City { get; private set; } public string Address { get; private set; } public string Postcode { get; private set; } } public class User { public User(string name, string password, string email) { this.Name = name; this.Password = password; this.Email = email; } public string Id { get; private set; } public string Name { get; private set; } public string Password { get; private set; } public string RealName { get; private set; } public string Email { get; private set; } public string Cellphone { get; private set; } public string Birthday { get; private set; } public AddressInfo Address { get; private set; } public void UpdateBasicInfo(string realName, string birthday, string cellphone) { this.RealName = realName; this.Birthday = birthday; this.Cellphone = cellphone; } public void UpdateAddress(AddressInfo address) { this.Address = address; } }
那么前端的代码也很简单
public class UserController { private readonly IUserRepository _userRepository; public void SetProfile(FormCollection form) { var user = _userRepository.Get(form.Get("id")); user.UpdateBasicInfo(form.Get("name"), form.Get("birthday"), form.Get("cellphone")); } public void SetAddress(FormCollection form) { var user = _userRepository.Get(form.Get("id")); var address = new AddressInfo(form.Get("province"), form.Get("city"), form.Get("address"), form.Get("postcode")); user.UpdateAddress(address); } }
以上的代码很好理解，只是设计了一个AddressInfo的值对象。
接下来将演示一下用户登录验证和修改密码。一般的做法：
public interface IUserRepository { User GetByName(string loginId); } public class UserController { private readonly IUserRepository _userRepository; public UserController(IUserRepository userRepository) { this._userRepository = userRepository; } public void Logon(FormCollection form) { User user = _userRepository.GetByName(form.Get("LoginId")); if (user == null) throw new Exception("loginId", "账号不存在。"); if (user.Password != form.Get("Password")) throw new Exception("password", "密码不正确。"); FormsAuthentication.SetAuthCookie(user.Name, createPersistentCookie); } }
请注意上述代码比较密码是错误的方式，因为上一篇说明了密码是加过密的。所以要修改一下，首先要注入IEncryptionService，那么就会这样判断
if (user.Password != _encryptionService.Encrypt(form.Get("Password")))
这样会有什么问题呢。目前IEncryptionService的接口相对还比较简单，如果IEncryptionService提供了针对不同业务的好多加密接口，那么前端人员就需要详细了解IEncryptionService的api，增加了复杂度。再对User封装一个方法，然后对Contoller代码再稍做修改
public class User { public bool VerifyPassword(string password, IEncryptionService encryptionService) { return this.Pasword == encryptionService.Encrypt(password); } } public class UserController { public void Logon(FormCollection form) { User user = _userRepository.GetByName(form.Get("LoginId")); if (user == null) throw new Exception("loginId", "账号不存在。"); if (user.VerifyPassword(form.Get("Password"), _encryptionService)) throw new Exception("password", "密码不正确。"); FormsAuthentication.SetAuthCookie(user.Name, createPersistentCookie); } }
这样具体密码采用了什么加密接口就不用关心了，将此规则封闭在了domain内，还有一个主要目的是为了修改密码时能够复用。也许你不并认同这种做法，好像也没啥变化，当然也没关系，解决问题就行，我只想表达聚合可以封装哪些方法。
再仔细考虑我觉得上述代码表达的业务还是比较多，首先要查询该登录名的用户是否存在，再去验证密码，如果需求再有其他规则，如禁用的用户不能登录，再用具有时效性的用户过期了也不能登录等等，这样是不是越来越复杂，前端开发人员需要掌握的业务知识就会越来越多，所以最好将此业务封装在领域内，ui端只需要传入登录名和密码。
说了这么多，User本身是无法做到这一点的，那么还是要将这些业务规则写在上一篇提到过的DomainService
public class DomainService { private readonly IUserRepository _userRepository; private readonly IEncryptionService _encryptionService; public DomainService(IUserRepository userRepository, IEncryptionService encryptionService) { this._userRepository = userRepository; this._encryptionService = encryptionService; } public User Authenticate(string loginId, string password) { var user = _userRepository.GetByName(loginId); if (user == null) throw new Exception("loginId", "账号不存在。"); if (!user.VerifyPassword(password, _encryptionService)) throw new Exception("password", "密码不正确。"); return user; } } public class UserController { public void Logon(FormCollection form) { try { User user = _domainService.Authenticate(form.Get("LoginId"), form.Get("Password")); FormsAuthentication.SetAuthCookie(user.Name, createPersistentCookie); } catch (Exception) { throw; } } }
这样是不是更好一点呢？
接下来再来说修改密码。直接上代码吧
public class User { public void ChangePassword(string oldPwd, string newPwd, IEncryptionService encryptionService) { if (!this.VerifyPassword(oldPwd, encryptionService)) throw new Exception("旧密码输入不正确。"); this.Pasword = encryptionService.Encrypt(newPwd); } } public class UserController { public void ModifyPassword(FormCollection form) { try { User user = _userRepository.GetByName(User.Identity.Name); user.ChangePassword(form.Get("oldPwd"), form.Get("newPwd"), _encryptionService); _userRepository.Update(user); } catch (Exception) { throw; } } }
好吧，这到这里吧，希望对你有帮助。下一篇再继续讨论丰富一下用户注册的过程，引入事件驱动。
标签：style blog color 使用 os io for 问题
原文地址：http://www.cnblogs.com/younghan/p/3891072.html
