Web services 如何将从授权标头获得的值插入构造函数

我正在编写的服务如下所示：

services.AddScoped<a,b>();
...
public interface a

public class b:a
{
   private readonly someDB db;
   public b(someDB db)
   {
      this.db = db;
   }
}

问题是从请求中检索到someType值。如何将该值注入构造函数？

---

为了简单起见，让我们考虑类型Boo[

如果它在请求中，那么在DI容器调用构造函数的时候就不可用了。< /P> 但是，您可以在请求范围内访问的成员中插入

IHttpContextAccessor

并提取头信息

public class b : a {
    private readonly someDB db;
    private readonly IHttpContextAccessor accessor;

    public b(someDB db, IHttpContextAccessor accessor) {
        this.db = db;
        this.accessor = accessor;
    }

    public void SomeMemberThatUsesT() {
        var request = accessor.HttpContext.Request;
        //extract desired header data
    }
}

public class b : a {
    private readonly someDB db;
    private readonly IHttpContextAccessor accessor;

    public b(someDB db, IHttpContextAccessor accessor) {
        this.db = db;
        this.accessor = accessor;
    }

    public void SomeMemberThatUsesT() {
        var request = accessor.HttpContext.Request;
        //extract desired header data
    }
}