还在为身份验证引入的Microsoft.AspNet.Identity.EntityFramework导致多上下文，生成的DB改名困扰吗？

　　最近一个项目需要在API里面集成身份验证，所以选择了Microsoft.AspNet.Identity.Core，以及Microsoft.AspNet.Identity.Owin来实现，但是在实现过程中发现了需要引入Microsoft.AspNet.Identity.EntityFramework ，导致在代码内出现了多个EF的上下文，虽然网上到处有改名的方式，但是对于强迫症患者，一个工程里多个上下文始终不能接受。果断查看有无方案解决

　　通过获取源码发现，Microsoft.AspNet.Identity.EntityFramework只是封装了EF，完全可以自己来做，下面简单说明下实现思路。

　　本文是基于web api5.2+unity+ef来实现

　　1.通过源码可以查看的继承体系

　　可以看到其核心是Core中的UserManager来操作，并且Microsoft.AspNet.Identity.EntityFramework封装了EF的上下文和操作的模型。

　　2.按照需要自定义模型

　　Microsoft.AspNet.Identity.EntityFramework IdentityRole -> RoleInfo ：IRole 只需要继承IRole即可，默认的左联按需取舍

　　IdentityUser -> UserInfo : IUser

　　自定义 UserRoleInfo，UserClaimInfo，AccountLoginInfo

　　3.把新的模型添加到自己的EF上下文

　　通过codefirst在Map里自定义表名字段类型等，想怎么做怎么做。

　　4.添加身份操作的Store替换Microsoft.AspNet.Identity.EntityFramework里的UserStore和RoleStore

　　定义一个新的接口，方便注入

/// <summary>  /// 身份验证Store接口  /// </summary>  public interface ICustomerIdentityStore :    IUserLoginStore<UserInfo, string>,    IUserClaimStore<UserInfo, string>,    IUserRoleStore<UserInfo, string>,    IUserPasswordStore<UserInfo, string>,    IUserSecurityStampStore<UserInfo, string>,    IQueryableUserStore<UserInfo, string>,    IUserEmailStore<UserInfo, string>,    IUserPhoneNumberStore<UserInfo, string>,    IUserTwoFactorStore<UserInfo, string>,    IUserLockoutStore<UserInfo, string>,    IUserStore<UserInfo>  {  }

　　然后实现其接口，思路的通过注入把上下文的仓储注入到实现里即可对DB进行操作

　　5. 自定义身份验证仓储接口和实现（样例代码）

/// <summary>  /// 身份验证仓储  /// </summary>  public interface IAuthRepository  {    /// <summary>    /// 注册用户    /// </summary>    /// <param name="userModel"></param>    /// <returns></returns>    Task<IdentityResult> RegisterUser(UserModel userModel);    /// <summary>    /// 查找用户    /// </summary>    /// <param name="userName"></param>    /// <param name="password"></param>    /// <returns></returns>    Task<UserInfo> FindUser(string userName, string password);    /// <summary>    /// 查找AppClient信息    /// </summary>    /// <param name="clientId"></param>    /// <returns></returns>    AppClientInfo FindClient(string clientId);    /// <summary>    /// 添加Token信息    /// </summary>    /// <param name="token"></param>    /// <returns></returns>    Task<bool> AddRefreshToken(RefreshTokenInfo token);    /// <summary>    /// 移除token信息    /// </summary>    /// <param name="refreshTokenId"></param>    /// <returns></returns>    Task<bool> RemoveRefreshToken(string refreshTokenId);    /// <summary>    /// 移除token信息    /// </summary>    /// <param name="refreshToken"></param>    /// <returns></returns>    Task<bool> RemoveRefreshToken(RefreshTokenInfo refreshToken);    /// <summary>    /// 查找token信息    /// </summary>    /// <param name="refreshTokenId"></param>    /// <returns></returns>    Task<RefreshTokenInfo> FindRefreshToken(string refreshTokenId);    /// <summary>    /// 查找所有刷新token信息    /// </summary>    /// <returns></returns>    List<RefreshTokenInfo> GetAllRefreshTokens();    /// <summary>    /// 通过登录信息查找用户信息    /// </summary>    /// <param name="loginInfo"></param>    /// <returns></returns>    Task<UserInfo> FindAsync(UserLoginInfo loginInfo);    /// <summary>    /// 创建用户信息    /// </summary>    /// <param name="user"></param>    /// <returns></returns>    Task<IdentityResult> CreateAsync(UserInfo user);    /// <summary>    /// 添加用户登录信息    /// </summary>    /// <param name="userId"></param>    /// <param name="login"></param>    /// <returns></returns>    Task<IdentityResult> AddLoginAsync(string userId, UserLoginInfo login);  }

　　然后添加其实现

/// <summary>  /// 身份验证仓储  /// </summary>  public class AuthRepository : IAuthRepository  {    /// <summary>    /// 仓储接口    /// </summary>    private readonly IUnitRepository _repository;    /// <summary>    /// 工作单元    /// </summary>    private readonly IUnitOfWork _unitOfWork;    /// <summary>    /// 用户管理    /// </summary>    private readonly UserManager<UserInfo> _userManager;    /// <summary>    /// ctor    /// </summary>    /// <param name="repository"></param>    /// <param name="unitOfWork"></param>    /// <param name="userStore"></param>    public AuthRepository(IUnitRepository repository, IUnitOfWork unitOfWork, ITaurusIdentityStore userStore)    {      _repository = repository;      _unitOfWork = unitOfWork;      _userManager = new UserManager<UserInfo>(userStore);    }    public async Task<IdentityResult> AddLoginAsync(string userId, UserLoginInfo login)    {      var result = await _userManager.AddLoginAsync(userId, login);      return result;    }    public async Task<bool> AddRefreshToken(RefreshTokenInfo token)    {      var existingToken = _repository.FirstOrDefault<RefreshTokenInfo>(r => r.Subject == token.Subject      && r.AppClientId == token.AppClientId);      if (existingToken != null)      {        var result = await RemoveRefreshToken(existingToken);      }      _repository.Insert(token);      return _unitOfWork.SaveChanges() > 0;    }    public async Task<IdentityResult> CreateAsync(UserInfo user)    {      var result = await _userManager.CreateAsync(user);      return result;    }    public async Task<UserInfo> FindAsync(UserLoginInfo loginInfo)    {      var user = await _userManager.FindAsync(loginInfo);      return user;    }    public AppClientInfo FindClient(string clientId)    {      var client = _repository.FirstOrDefault<AppClientInfo>(s => s.Id == clientId);      return client;    }    public Task<RefreshTokenInfo> FindRefreshToken(string refreshTokenId)    {      var refreshToken = _repository.FirstOrDefault<RefreshTokenInfo>(s => s.TokenId == refreshTokenId);      return Task.FromResult(refreshToken);    }    public async Task<UserInfo> FindUser(string userName, string password)    {      var user = await _userManager.FindAsync(userName, password);      return user;    }    public List<RefreshTokenInfo> GetAllRefreshTokens()    {      return _repository.All<RefreshTokenInfo>().ToList();    }    public async Task<IdentityResult> RegisterUser(UserModel userModel)    {      var user = new UserInfo      {        UserName = userModel.UserName,        Id = Guid.NewGuid().ToString(),        FullName = "test",        CreateTime = DateTime.Now,        CreateBy = Guid.Empty.ToString(),        UpdateBy = Guid.Empty.ToString(),        UpdateTime = DateTime.Now      };      var result = await _userManager.CreateAsync(user, userModel.Password);      return result;    }    public Task<bool> RemoveRefreshToken(RefreshTokenInfo refreshToken)    {      _repository.DeleteItem(refreshToken);      var result = _unitOfWork.SaveChanges() > 0;      return Task.FromResult(result);    }    public Task<bool> RemoveRefreshToken(string refreshTokenId)    {      var refreshToken = _repository.FirstOrDefault<RefreshTokenInfo>(s => s.Id == refreshTokenId);      var result = false;      if (refreshToken != null)      {        _repository.DeleteItem(refreshToken);        result = _unitOfWork.SaveChanges() > 0;      }      return Task.FromResult(result);    }  }

　　思路是通过注入ICustomerIdentityStore(IUserStore)构造出UserManager实例