如何在ASP.NET Core中获得当前用户

Question

我想要一个当前用户来获取用户信息，例如电子邮件。但是我不能在asp.net核心中做到这一点。我很困惑这是我的代码。

HttpContext在控制器的构造函数中几乎为null 。在每个动作中都吸引用户是不好的。我想一次获取用户信息并设置为ViewData;

public DashboardController()

{

    var user = HttpContext.User.GetUserId();

}

Answer 1

User.FindFirst(ClaimTypes.NameIdentifier).Value编辑构造函数下面的代码有效：public Controller(IHttpContextAccessor httpContextAccessor){&nbsp; &nbsp; var userId = httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.NameIdentifier).Value&nbsp;}编辑RTM您应该注册IHttpContextAccessor：&nbsp; &nbsp; public void ConfigureServices(IServiceCollection services)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();&nbsp; &nbsp; }