UserManager.FindAsync不使用UserStore的自定义实现

Question

我在ASP.NET身份方面相对较新.为了更好地理解这些事情,我正在进行ASP.NET身份的自定义实现.我能够使用自定义代码成功创建用户.但是FindAsync(username, password)功能不起作用.

这是我到目前为止所做的:

用户:这是我的User继承自的类IUser<int>

public class User:IUser<int>
{
    public User(){ Id = 0; }

    public int Id { get; private set; }
    public string UserName { get; set; }
    public string PasswordHash { get; set; }
    public string SecurityStamp { get; set; }
}

UserStore:这是自定义实现的IUserStore' and 'IUserPasswordStore

public class UserStore : IUserStore<User, int>, IUserPasswordStore<User, int>
{
    private IdentityContext _context;
    public UserStore()
    {
        _context = new IdentityContext();
    }

    public void Dispose()
    {
        throw new NotImplementedException();
    }

    #region IUserStore<T,K> members
    public Task CreateAsync(User user)
    {
        _context.Users.Add(user);
        _context.SaveChangesAsync();
        return Task.FromResult(true);
    }

    public Task UpdateAsync(User user)
    {
        throw new NotImplementedException();
    }

    public Task DeleteAsync(User user)
    {
        throw new NotImplementedException();
    }

    public Task<User> FindByIdAsync(int userId)
    {
        return _context.Users.FirstOrDefaultAsync(user=>user.Id==userId);
    }

    public Task<User> FindByNameAsync(string userName)
    {
        var user = _context.Users.SingleOrDefaultAsync(u => u.UserName.Equals(userName));
        return user;
    }
    #endregion

    #region IUserPasswordStore<User,int>
    public Task SetPasswordHashAsync(User user, string passwordHash)
    {
        user.PasswordHash = passwordHash;
        return Task.FromResult(true);
    }

    public Task<string> GetPasswordHashAsync(User user)
    {
        return new Task<string>(() => user.PasswordHash);
    }

    public Task<bool> HasPasswordAsync(User user)
    {
        throw new NotImplementedException();
    }
    #endregion
}

在我的MVC5控制器中,我有以下行尝试通过用户名和密码查找用户:

var user = await UserManager.FindAsync("User1355436", "passw0rd");

上面的代码行依次调用以下方法UserStore:

public Task<User> FindByNameAsync(string userName)和 public Task<string> GetPasswordHashAsync(User user).

之后,代码永久地进入等待状态,没有任何反应,即控件永远不会再次返回控制器.

我在这里缺少什么？

Answer 1

这行代码很可能出现问题......

return new Task<string>(() => user.PasswordHash);

...这会创建一个永不启动的任务,因此等待其继续的代码将永远等待.要返回包含在任务中的值,请使用Task.FromResult()...

return Task.FromResult(user.PasswordHash);