EntityFrameworkCore-启用DbContextPool时如何注入IPrincipal [英] EntityFrameworkCore - How to inject IPrincipal when DbContextPool is enabled

问题描述

我有一个aspnet核心MVC应用程序，我需要注入当前请求的 IPrincipal ，以便我知道谁是当前登录的用户.我紧随了这篇文章.

I have an aspnet core MVC application, and I need to inject the IPrincipal of the current request so that I know who is the current logged in user. I followed this article with no problem.

现在，我需要在 Dbcontext 中使用 IPrincipal 来自动填充审核字段(CreatedBy，UpdatedBy等).天真了，我可以在我的 DbContext 构造函数中注入 IPrincipal :

Now I need the IPrincipal in my Dbcontext to auto-populate audit fields (CreatedBy, UpdatedBy, etc). Being naive I could inject the IPrincipal in my DbContext constructor:

public MyDBContext(DbContextOptions<MyDBContext> options, IPrincipal principal)

但是我正在使用 DBContextPool ，它在WebAPI请求中重用 DbContext 实例.

But I am using the DBContextPool, which reuses DbContext instances across WebAPI requests.

在这种情况下，注入 IPrincipal 的正确方法是什么?

What's the proper way to inject IPrincipal in this scenario?

-------------------更新----------------------

------------------- Update ----------------------

我想我可以采用与

I am thinking I can follow the same approach as the HttpContextAccesor, and create a IClaimsPrincipalAccessor, register it as a singleton and inject it into my Dbcontext.

对于ASP网络核心应用程序，我需要一个 HttpContextClaimsPrincipalAccesor ，其中 ClaimsPrincipal 来自 HttpContext.User

For asp net core applications I need an HttpContextClaimsPrincipalAccesor, where ClaimsPrincipal comes from the HttpContext.User

推荐答案

您可以注册

You can register the IPrincipal as a Transient service on your Startup, like:

public void ConfigureServices(IServiceCollection services)
{
    services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
    services.AddTransient<IPrincipal>(provider => 
                provider.GetService<IHttpContextAccessor>().HttpContext.User);
    // ...
}

然后在DbContext构造函数上，可以注入

Then on your DbContext constructor you can inject the IServiceProvider that will allow you to get the current IPrincipal instance, for example:

public class YourDbContext : DbContext
{
    private IServiceProvider _services;
    public YourDbContext(IServiceProvider services)
    {
        _services = services;
    }
    public void SomeMethod()
    {
        var principal = _services.GetService<IPrincipal>();
        // ...
    }
}

这篇关于EntityFrameworkCore-启用DbContextPool时如何注入IPrincipal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IT屋！