在 ASP.NET Core 应用中使用 Cookie 进行身份认证 (3)

而当我们需要在一个独立的类库中获取存储的用户信息时，我们需要进行如下的操作

第一步，在 Startup.ConfigureServices 方法中注入 HttpContextAccessor 服务

public class Startup { public void ConfigureServices(IServiceCollection services) { // 注入 HttpContext services.AddHttpContextAccessor(); } }

第二步，在你需要使用的类库中通过 Nuget 引用 Microsoft.AspNetCore.Http，之后就可以在具体的类中通过注入 IHttpContextAccessor 来获取到用户信息，当然，也可以在此处实现登录、登出的方法

namespace Sample.Infrastructure { public interface ICurrentUser { string UserName { get; } Task SignInAsync(ClaimsPrincipal principal); Task SignOutAsync(); Task SignOutAsync(string scheme); } public class CurrentUser : ICurrentUser { private readonly IHttpContextAccessor _httpContextAccessor; private HttpContext HttpContext => _httpContextAccessor.HttpContext; public CurrentUser(IHttpContextAccessor httpContextAccessor) { _httpContextAccessor = httpContextAccessor ?? throw new ArgumentNullException(nameof(httpContextAccessor)); } public string UserName => HttpContext.User.FindFirst(ClaimTypes.Name)?.Value; public Task SignInAsync(ClaimsPrincipal principal) => HttpContext.SignInAsync(principal); public Task SignOutAsync() => HttpContext.SignOutAsync(); public Task SignOutAsync(string scheme) => HttpContext.SignOutAsync(scheme); } }

至此，整块的认证功能就已经实现了，希望对你有所帮助

Reference

SameSite cookies

Work with SameSite cookies in ASP.NET Core

What does the CookieAuthenticationOptions.LogoutPath property do in ASP.NET Core 2.1?

理解ASP.NET Core验证模型(Claim, ClaimsIdentity, ClaimsPrincipal)不得不读的英文博文

Introduction to Authentication with ASP.NET Core