如何使用Net Core在DbContext中获取用户信息

问题描述

我正在尝试开发一个类库，我想在该类库中实现自定义 DbContext 。在 DbContext 的 SaveChanges 方法中，我需要获取当前用户的信息（部门，用户名等）以进行审核。目的。 DbContext 代码的某些部分如下：

I am trying to develop a class library in which i want to implement custom DbContext. In the SaveChanges method of the DbContext, i need to get current user’s information(department, username etc.) for auditing purpose. Some part of the DbContext code is below:

public override int SaveChanges()
{
    // find all changed entities which is ICreateAuditedEntity
    var addedAuditedEntities = ChangeTracker.Entries<ICreateAuditedEntity>()
           .Where(p => p.State == EntityState.Added)
           .Select(p => p.Entity);

    var now = DateTime.Now;

    foreach (var added in addedAuditedEntities)
    {
        added.CreatedAt = now;
        added.CreatedBy = ?;
        added.CreatedByDepartment = ?
    }
    return base.SaveChanges();
}

我想到了两个选择：

• 使用 HttpContext.Items 保留用户信息，注入IHttpContextAccessor并从
  HttpContext.Items （在这种情况下， DbContext 取决于 HttpContext ，是否为
  正确吗？）


• 使用ThreadStatic对象而不是 HttpContext.Items 并从对象中获取信息（我读了一些文章
  ThreadStatic不安全）

• Using HttpContext.Items to keep user information, injecting IHttpContextAccessor and getting information from theHttpContext.Items(In this case DbContext depends HttpContext, is itcorrect?)
• Using ThreadStatic object instead of HttpContext.Items and getting information from the object( I read some poststhat ThreadStatic is not safe)

问题：哪种情况最适合我的情况？您有其他建议吗？

Question : Which is the best fit into my case? Is there another way you suggest?

推荐答案

我实现了与，基本上涉及创建服务它将使用依赖项注入将 HttpContext （和底层用户信息）注入到特定上下文中，或者您可能更喜欢使用它。

I implemented an approach similar to this that is covered in this blog post and basically involves creating a service that will use dependency injection to inject the HttpContext (and underlying user information) into a particular context, or however you would prefer to use it.

一个非常基本的实现可能看起来像这样：

A very basic implementation might look something like this:

public class UserResolverService
{
    private readonly IHttpContextAccessor _context;
    public UserResolverService(IHttpContextAccessor context)
    {
        _context = context;
    }

    public string GetUser()
    {
       return _context.HttpContext.User?.Identity?.Name;
    }
}

您只需要将其注入到内部的管道中 Startup.cs 文件中的 ConfigureServices 方法：

You would just need to inject this into the pipeline within the ConfigureServices method in your Startup.cs file :

services.AddTransient<UserResolverService>();

然后，最后，在指定的 DbContext ：

And then finally, just access it within the constructor of your specified DbContext :

public partial class ExampleContext : IExampleContext
{
    private YourContext _context;
    private string _user;
    public ExampleContext(YourContext context, UserResolverService userService)
    {
        _context = context;
        _user = userService.GetUser();
    }
}

然后您应该可以使用 _user 在您的上下文中引用当前用户。可以轻松扩展此功能，以存储/访问当前请求中可用的任何内容。

Then you should be able to use _user to reference the current user within your context. This can easily be extended to store / access any content available within the current request as well.

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