src/Hotline/FlowEngine/Workflows/WorkflowDomainService.cs

@@ -875,7 +875,7 @@ namespace Hotline.FlowEngine.Workflows
 
         private static void CheckWhetherRunnable(EWorkflowStatus status)
         {
-            if (status is not EWorkflowStatus.Runnable or EWorkflowStatus.Marked)
+            if (status != EWorkflowStatus.Runnable && status != EWorkflowStatus.Marked)
                 throw new UserFriendlyException("当前流程状态不可继续流转");
         }