帮助中有如此论述，指出recycling参数的主要性：

The Recycling parameter controls feature object allocation behavior. Recycling cursors rehydrate a single feature object on each fetch and can be used to optimize read-only access, for example, when drawing. It is illegal to maintain a reference on a feature object returned by a recycling cursor across multiple calls to NextFeature on the cursor. Feature objects returned by a recycling cursor should not be modified.

Non-recycling cursors return a separate feature object on each fetch. The objects returned by a non-recycling cursor may be modified and stored with polymorphic behavior. The geodatabase guarantees 'unique instance semantics' on non-recycling feature objects fetched during an edit session.

Recycling cursors should be used only for drawing and read-only access to object state. Use non-recycling search cursors to fetch objects that are to be updated.

通过下面的函数可以测试该参数的重要性：

Const N = 100000

Sub TestRecycle()
Dim amap As IMxDocument
Set amap = ThisDocument

  Dim lyr As IFeatureLayer
  Set lyr = amap.FocusMap.Layer(0)
  Dim fc As IFeatureCursor
 
  Dim qr As IQueryFilter
  Set qr = New QueryFilter
  qr.WhereClause = "objectID < " & N
  Dim dt As Date
 
  Debug.Print "Recyle: False"
  dt = Now
  Set fc = lyr.Search(qr, False)
  While Not fc.NextFeature Is Nothing
 
  Wend
Debug.Print "Seconds: " & DateDiff("s", dt, Now)
 
  dt = Now
  Debug.Print "Recyle: True"
  Set fc = lyr.Search(qr, True)
  While Not fc.NextFeature Is Nothing
 
  Wend
Debug.Print "Seconds: " & DateDiff("s", dt, Now)
 
End Sub

结果如下：

N=100000

Recyle: False
Seconds: 3
Recyle: True
Seconds: 1

N=500000

Recyle: False
Seconds: 12
Recyle: True
Seconds: 8

说