将 IHttpContextAccessor 注入 ApplicationDbContext ASP.NET Core 1.0

Injecting IHttpContextAccessor into ApplicationDbContext ASP.NET Core 1.0(将 IHttpContextAccessor 注入 ApplicationDbContext ASP.NET Core 1.0)

问题描述

我试图弄清楚如何在 ASP.NET 控制器之外访问当前登录的用户名.

I am trying to figure out how to get access to the current logged in username outside of an ASP.NET Controller.

例如我正在尝试这样做:

For example I am trying to do this:

跟踪使用实体框架代码自动创建和修改字段

在 DbContext 中设置实体跟踪.

To setup tracking on entities in the DbContext.

这是我的 ApplicationDbContext 但我不断收到错误消息，提示 _httpContextAccessor is null:

Here is my ApplicationDbContext but I keep getting an error saying _httpContextAccessor is null:

private readonly IHttpContextAccessor _httpContextAccessor;

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

推荐答案

尝试注入 IHttpContextAccessor 接口

你甚至可以通过创建一个服务来进一步抽象它来提供你想要的信息(这是当前登录的用户名)

You can even abstract it further by creating a service to provide just the information you want (Which is the current logged in username)

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";
    }
}

您现在需要在 Startup.ConfigureServices 中设置 IHttpContextAccessor 以便能够注入它:

You need to setup IHttpContextAccessor now in Startup.ConfigureServices in order to be able to inject it:

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
//OR
//services.AddHttpContextAccessor();
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

and pass that to your repository as needed to record associated username

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