Question

我试图弄清楚如何访问ASP.NET控制器之外的当前登录用户名。

例如我正在尝试这样做：

Track Created and Modified fields Automatically with Entity Framework Code First

设置DbContext。

中实体的跟踪

以下是我的ApplicationDbContext，但我一直收到错误消息，指出_httpContextAccessor为null：

private readonly IHttpContextAccessor _httpContextAccessor;

public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options, IHttpContextAccessor httpContextAccessor)
    : base(options)
{
    _httpContextAccessor = httpContextAccessor;
}

Answer 1

尝试注入IHttpContextAccessor接口

您甚至可以通过创建服务来进一步抽象，以提供您想要的信息（当前登录的用户名）

public interface IUserResolverService {
    string GetUser();
}

public class UserResolverService : IUserResolverService {
    private readonly IHttpContextAccessor accessor;
    public UserResolverService(IHttpContextAccessor accessor) {
        this.accessor = accessor;
    }

    public string GetUser() {
        var username = accessor?.HttpContext?.User?.Identity?.Name ;
        return username ?? "unknown";
    }
}

您需要在IHttpContextAccessor中设置Startup.ConfigureServices以便能够注入它：

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddTransient<IUserResolverService, UserResolverService>();

并根据需要将其传递到您的存储库以记录关联的用户名

Answer 2

@Nkosi有正确的答案，但请注意IHttpContextAccessor现在位于名称空间下：

Microsoft.AspNetCore.Http;

不再在：

Microsoft.AspNet.Http;

将IHttpContextAccessor注入ApplicationDbContext ASP.NET Core 1.0

2 个答案: