你说得对但是

System.NullReferenceException: Object reference not set to an instance of an object.

  at Phigrim.Core.Account.Tenants.TapTap.TapTapTenant.HandleRefresh (System.Threading.CancellationToken cancellationToken) [0x00000] in <00000000000000000000000000000000>:0

  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <00000000000000000000000000000000>:0

  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+MoveNextRunner.Run () [0x00000] in <00000000000000000000000000000000>:0

  at System.Threading.Tasks.AwaitTaskContinuation.RunCallback (System.Threading.ContextCallback callback, System.Object state, System.Threading.Tasks.Task& currentTask) [0x00000] in <00000000000000000000000000000000>:0

  at System.Threading.Tasks.Task.FinishContinuations () [