一个未初始化的固定数组 (Dim a(i, j)) 包含 i * j 个空元素;您的
if not dic.Exists(MyDataset(0, i)) then dic.Add MyDataset(0, i), ""
将拿起并计算第一个空项目。在代码中演示:
Dim afCart(3, 4)
Dim dicPID : Set dicPID = countPID00(afCart)
Dim aKeys : aKeys = dicPID.Keys
Dim vKey : vKey = aKeys(0)
WScript.Echo "A", dicPID.Count, TypeName(vKey)
Set dicPID = countPID(afCart)
WScript.Echo "B", dicPID.Count
afCart(0, 0) = "ignored"
afCart(0, 1) = 4711
afCart(0, 2) = 4712
afCart(0, 3) = 4711
' afCart(0, 4) = "not initialized/Empty"
Set dicPID = countPID(afCart)
WScript.Echo "C"
For Each vKey In dicPID.Keys
WScript.Echo "", vKey, "=", dicPID(vKey)
Next
Function countPID00(afCart)
Dim dicRVal : Set dicRVal = CreateObject("Scripting.Dictionary")
Dim MyDataset : MyDataset = afCart ' waste of ressources
Dim iRow
For iRow = 1 To UBound(MyDataset, 2)
If Not dicRVal.Exists(MyDataset(0, iRow)) Then
dicRVal(MyDataset(0, iRow)) = "" ' loss of info; will pick up Empty item
End If
Next
Set countPID00 = dicRVal
End Function ' countPID00
Function countPID(afCart)
Dim dicRVal : Set dicRVal = CreateObject("Scripting.Dictionary")
Dim iRow
For iRow = 1 To UBound(afCart, 2)
If Not IsEmpty(afCart(0, iRow)) Then
dicRVal(afCart(0, iRow)) = dicRVal(afCart(0, iRow)) + 1
End If
Next
Set countPID = dicRVal
End Function ' countPID
输出:
A 1 Empty
B 0
C
4711 = 2
4712 = 1