HttpContext.Current在ASP.NET Core中已经不存在了，但是有一个新的
IHttpContextAccessor东西可以注入到您的依赖中并用来检索当前的
HttpContext：
public class MyComponent : IMyComponent{ private readonly IHttpContextAccessor _contextAccessor; public MyComponent(IHttpContextAccessor contextAccessor) { _contextAccessor = contextAccessor; } public string GetDataFromSession() { return _contextAccessor.HttpContext.Session.GetString(*KEY*); }}
