HttpContext 在 http 请求点击您的网站时被填充(非常简单的解释).

HttpContext is populated when a http request hits your site (very simple explanation).

将 IHostedService 视为独立于任何 http 请求在后台运行的东西，它在与例如命中控制器的请求完全不同的上下文中运行.

Think of a IHostedService as something that runs in the background independent of any http requests, it runs in a completely different context than for example the requests that hits your controllers.

HttpContext 与 ASP.NET Core 紧密相关，而 IHostedService 不需要 ASP.NET Core 来运行.

HttpContext is heavily tied to ASP.NET Core while IHostedService does not need ASP.NET Core to run.