从table到layer的join问题

<P>我想在mapcontrol里实现从table到layer的join，下面的代码可以运行，但是join不上去啊，大家帮我看看吧</P>
<P>'relate
  Dim pRelationshipClass As IRelationshipClass
  Dim pMemRelationshipClassFact As IMemoryRelationshipClassFactory
  Set pMemRelationshipClassFact = New MemoryRelationshipClassFactory
  Set pRelationshipClass = pMemRelationshipClassFact.Open("JoinTable", _
  pFeatureClass, "ID", pTable, "ID", "forward", "backward", _
  esriRelCardinalityOneToMany)
  
  'join
  Dim pDisplayRelationshipClass As IDisplayRelationshipClass
  Set pDisplayRelationshipClass = pFeatureLayer
  pDisplayRelationshipClass.DisplayRelationshipClass pRelationshipClass, esriLeftOuterJoin
  </P><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em02.gif" />