src/Hotline.Api/Controllers/KnowledgeApplyController.cs

@@ -97,7 +97,7 @@ namespace Hotline.Api.Controllers
             if (string.IsNullOrEmpty(dto.Code))
             {
                 var know = await _knowledgeRepository.GetAsync(dto.KnowledgeId, HttpContext.RequestAborted);
-                handle.Code = know?.Code;
+                dto.Code = know?.Code;
             }
             handle.Status = EKnowledgeApplyStatus.Succeed;
             handle.HandleTime = DateTime.Now;