ASP.NET Core 在控制器构造函数中访问 User.Identity

Question

我有一个场景，我需要访问构造函数控制器中的

User.Identity

声明。

我需要这个，因为声明包含我启动自定义数据库上下文（连接字符串）所需的信息

我怎样才能访问这个？我只会注入 DBContext，但根据用户，他们可能需要访问不同的数据库。

有更好的方法来思考这个问题吗？

[Authorize]
public class DefaultController : Controller
{
    public DefaultController()
    {
        // this is NULL
        var authenticatedUser = User.Identity.Name;
    }
}

Answer 1

从 ASP.NET Core 2.1 版本开始，提供了

HttpContextAccessor

。为此，我们必须遵循以下步骤：

使用

ConfigureServices

的

Startup.cs

方法中的标准实现配置服务：

services.AddHttpContextAccessor();

在控制器上执行

IHttpContextAccessor

的依赖注入。使用

HttpContext

属性访问

User

[Authorize]
public class DefaultController : Controller
{
    public DefaultController(IHttpContextAccessor contextAccessor)
    {
        // Here HttpContext is not Null :)
        var authenticatedUser = contextAccessor.HttpContext.User.Identity.Name;
    }
}

Answer 2

来自 Rabea AlTaradeh 上面的链接：

    Startup.cs
     //services section
     services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

[Authorize]
public class HomeController : Controller
{
  #region DI         
  private string UserEmail;
  private readonly IHttpContextAccessor _httpContextAccessor;
  public HomeController(IHttpContextAccessor httpContextAccessor)
  {
    _httpContextAccessor = httpContextAccessor;
    UserEmail = _httpContextAccessor.HttpContext.User.Claims
                .FirstOrDefault(c => c.Type == "preferred_username")?.Value;

  }
  #endregion DI 
   public IActionResult Index()
   {            
      ViewBag.UserEmail = UserEmail;   
      return View();
   }
}

Answer 3

要访问 .Net core 中的 User.Identity Claims，您需要使用 HttpContext。这是我的以下实现

首先注册

services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();

然后在Service或者Controller类中注册

private readonly IHttpContextAccessor _httpContextAccessor;

public UserService(
            IHttpContextAccessor httpContextAccessor,
            IUnitOfWork unitOfWork,
            UserManager<User> userManager,
            SignInManager<User> signInManager,
            RoleManager<ApplicationRole> roleManager)
        {
            _httpContextAccessor = httpContextAccessor;
            _unitOfWork = unitOfWork;
            _userManager = userManager;
            _signInManager = signInManager;
            _roleManager = roleManager;
            _currentUserGuid = _httpContextAccessor?.HttpContext?.User?.FindFirst(UserClaimsKey.Sub)?.Value;
            _currentUserName = _httpContextAccessor?.HttpContext?.User?.Identity?.Name;
            _currentUserEmail = _currentUserGuid == null ? "" : userManager.FindByIdAsync(_currentUserGuid)?.Result?.Email;
        }

实现细节可以在这里找到

如有任何问题请告诉我

Answer 4

这是我用来获取索赔的代码：

int user_id = 0;
int Account_id = 0;
List<string> roles;

public TEMP_CON_Controller(DatabaseContext context,IHttpContextAccessor,httpContextAccessor)
{
  _context = context;
  if (httpContextAccessor.HttpContext.User.Identity.IsAuthenticated)
  {
    var user = httpContextAccessor.HttpContext.User;

    this.user_id = int.Parse(user.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value);

    IEnumerable<Claim> claims = user.Claims;

    var accId = claims.Where(x => x.Type == "AccountId").Select(c => c.Value).SingleOrDefault();

    if (!string.IsNullOrEmpty(accId))
      this.Account_id = Int32.Parse(accId);

    roles = claims.Where(x => x.Type == ClaimTypes.Role).Select(c => c.Value).ToList();
  }
}

Answer 5

在 Asp.net Core v.2+ 中，您不必注入 HttpContext 之类的东西。像这样访问用户：

public IActionResult GetMe()
{
    return Ok(User.Identity.Name);
}