ASP.NET Core Identity - 获取当前用户 [英] ASP.NET Core Identity - get current user

问题描述

要在 MVC5 中获取当前登录的用户，我们要做的就是:

To get the currently logged in user in MVC5, all we had to do was:

using Microsoft.AspNet.Identity;
[Authorize]
public IHttpActionResult DoSomething() {
    string currentUserId = User.Identity.GetUserId();
}

现在，使用 ASP.NET Core 我认为这应该可以工作，但它会引发错误.

Now, with ASP.NET Core I thought this should work, but it throws an error.

using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Http;

private readonly UserManager<ApplicationUser> _userManager;
[HttpPost]
[Authorize]
public async Task<IActionResult> StartSession() {
    var curUser = await _userManager.GetUserAsync(HttpContext.User);
}

有什么想法吗?

Gerardo 的回复正常，但要获取用户的实际ID"，这似乎有效:

Gerardo's response is on track but to get the actual "Id" of the user, this seems to work:

ClaimsPrincipal currentUser = this.User;
var currentUserID = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value;

推荐答案

如果您的代码在 MVC 控制器中:

public class MyController : Microsoft.AspNetCore.Mvc.Controller

从 Controller 基类，您可以从 User 属性获取 ClaimsPrincipal

From the Controller base class, you can get the ClaimsPrincipal from the User property

System.Security.Claims.ClaimsPrincipal currentUser = this.User;

您可以直接检查索赔(无需往返数据库):

You can check the claims directly (without a round trip to the database):

bool isAdmin = currentUser.IsInRole("Admin");
var id = _userManager.GetUserId(User); // Get user id:

可以从数据库的 User 实体中获取其他字段:

Other fields can be fetched from the database's User entity:

1. 使用依赖注入获取用户管理器

1. Get the user manager using dependency injection

private UserManager<ApplicationUser> _userManager;

//class constructor
public MyController(UserManager<ApplicationUser> userManager)
{
    _userManager = userManager;
}

并使用它:

And use it:

var user = await _userManager.GetUserAsync(User);
var email = user.Email;

如果你的代码是一个服务类，你可以使用依赖注入来获取一个IHttpContextAccessor，让你从HttpContext中获取User.

If your code is a service class, you can use dependency injection to get an IHttpContextAccessor that lets you get the User from the HttpContext.

    private IHttpContextAccessor _httpContextAccessor;

    public MyClass(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    private void DoSomething()
    {
        var user = _httpContextAccessor.Context?.User;
    }

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