调用异步方法前
HttpContext context = System.Web.HttpContext.Current; HttpRuntime.Cache.Insert("context", context);
异步方法里
HttpContext context = HttpContext.Current; if (context == null) { context = HttpRuntime.Cache.Get("context") as HttpContext; }
摘自：https://blog.csdn.net/chenjian88886666/article/details/82959252
原文：https://www.cnblogs.com/WeiYongZhi/p/12050386.html