将IHttpContextAccessor注入ApplicationDbContext ASP.NET Core 1.0

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问题描述

我正在尝试弄清楚如何在ASP.NET Controller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:

跟踪首先使用实体框架代码自动创建和修改的字段

要设置对DbContext中实体的跟踪.

To setup tracking on entities in the DbContext.

这是我的ApplicationDbContext，但我不断收到错误消息，说_httpContextAccessor是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

您甚至可以通过创建服务以仅提供所需的信息(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才能注入它:

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，以记录相关的用户名

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

这篇关于将IHttpContextAccessor注入ApplicationDbContext ASP.NET Core 1.0的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！