System.NullReferenceException: Object reference not set to an instance of an object.at System.Web.ThreadContext.AssociateWithCurrentThread(System.Boolean setImpersonationContext) at offset 20at System.Web.HttpApplication.OnThreadEnterPrivate(System.Boolean setImpersonationContext) at offset 12at System.Web.HttpApplication.System.Web.Util.ISyncContext.Enter() at offset 0at System.Web.Util.SynchronizationHelper.SafeWrapCallback(System.Action action) at offset 24at System.Threading.Tasks.Task.Execute() at offset 16
关于 ASP.NET Web 应用中 async/await 注意问题
原文地址：https://www.cnblogs.com/Irving/p/8432248.html