如何一次过滤多个“数组”？

Question

我试图写一个将通过两个给定阵列，“去年购买的客户”和“今年购买的客户”并创建三个阵列的子版本; “去年购买谁”，“今年买谁”和“每年购买”。既然这两个名单都有两年都买的名字，我正在努力将两者区分为单独的数组。到目前为止，该规范成功地实现了“两年/两年都购买”的阵列，但我无法实现其他2个并分开。 任何意见我要去哪里错将不胜感激。 谢谢！

Sub MergeLists() 
' The listSizex variables are list sizes for the various lists (x from 1 to 3). 
' The listx arrays contains the members of the lists (again, x from 1 to 3). 
' The lists are indexed from 1 to 3 as follows: 
' list1 - customers from last year (given data) 
' list2 - customers from this year (given data) 
' list3 - customers who bought in either or both years (to be found) 
' list4 - customers who bought only last year (to be found) 
' list5 - customers who bought only this year (to be found) 

    Dim i1 As Integer, i2 As Integer, i3 As Integer, i4 As Integer, i5 As Integer ' counters 
    Dim listSize1 As Integer, listSize2 As Integer, listSize3 As Integer, listSize4 As Integer, listSize5 As Integer 
    Dim list1() As String, list2() As String, list3() As String, list4() As String, list5() As String 
    Dim index1 As Integer, index2 As Integer 
    Dim name1 As String, name2 As String 
    ' Delete the old merged list (if any) in column D. 

    With wsData.Range("D3:F3") 
     Range(.Offset(1, 0), .Offset(1, 0).End(xlDown)).ClearContents 
    End With 
    ' Get the list sizes and the names for the given data in columns A, B. 

    With wsData.Range("A3") 
     listSize1 = Range(.Offset(1, 0), .End(xlDown)).Rows.Count 
     ReDim list1(1 To listSize1) 
     For i1 = 1 To listSize1 
      list1(i1) = .Offset(i1, 0).Value 
     Next 
     listSize2 = Range(.Offset(1, 1), .Offset(0, 1).End(xlDown)).Rows.Count 
     ReDim list2(1 To listSize2) 
     For i2 = 1 To listSize2 
      list2(i2) = .Offset(i2, 1).Value 
     Next 
    End With 

    ' Create the merged list. First, initialize new list sizes to be 0. 
    listSize3 = 0 
    listSize4 = 0 
    listSize5 = 0 

    ' Go through list1 and list2 simultaneously. The counters index1 and index2 
    ' indicate how far down each list we currently are, and name1 and name2 are 
    ' the corresponding customer names. First, initialize index1 and index2. 
    index1 = 1 
    index2 = 1 

    ' Keep going until we get past at least one of the lists. 

    Do While index1 <= listSize1 And index2 <= listSize2 
     name1 = list1(index1) 
     name2 = list2(index2) 
     ' Each step through the loop, add one customer name to the merged list, so 
     ' update the list size and redim list3 right now. 
     listSize3 = listSize3 + 1 
     listSize4 = listSize4 + 1 
     listSize5 = listSize5 + 1 
     ReDim Preserve list3(1 To listSize3) 
     ReDim Preserve list4(1 To listSize4) 
     ReDim Preserve list5(1 To listSize5) 
     ' See which of the two names being compared is first in alphabetical order. 
     ' It becomes the new member of the merged list. Once it's added, go to the 
     ' next name (by updating the index) in the appropriate list. In case of a tie, 
     ' update both indexes. 
     If name1 < name2 Then 
      list3(listSize3) = name1 
      index1 = index1 + 1 
     ElseIf name1 > name2 Then 
      list3(listSize3) = name2 
      index2 = index2 + 1 
     ElseIf name1 = name2 Then 
      list3(listSize3) = name2 
      index1 = index1 + 1 
      index2 = index2 + 1 
     ElseIf name1 <> name2 Then 
      list4(listSize4) = name1 
      index1 = index1 + 1 
     ElseIf name2 <> name1 Then 
      list5(listSize5) = name2 
      index2 = index2 + 1 
     End If 
    Loop 
    ' By this time, we're through at least one of the lists (list1 or list2). 
    ' Therefore, add all leftover names from the OTHER list to the merged list. 
    If index1 > listSize1 And index2 <= listSize2 Then 
     ' Some names remain in list2. 
     For i2 = index2 To listSize2 
      listSize3 = listSize3 + 1 
      ReDim Preserve list3(1 To listSize3) 
     Next 
    ElseIf index1 <= listSize1 And index2 > listSize2 Then 
     ' Some names remain in list1. 
     For i1 = index1 To listSize1 
      listSize3 = listSize3 + 1 
      ReDim Preserve list3(1 To listSize3) 

     Next 
    End If 
    ' Record the merged list in column F of the worksheet. 
    With wsData.Range("F3") 
     For i3 = 1 To listSize3 
      .Offset(i3, 0).Value = list3(i3) 
     Next 
    End With 

    With wsData.Range("D3") 
     For i4 = 1 To listSize4 
      .Offset(i4, 0).Value = list3(i4) 
     Next 
    End With 

    With wsData.Range("E3") 
     For i5 = 1 To listSize5 
      .Offset(i5, 0).Value = list3(i5) 
     Next 
    End With 
    ' End with the cursor in cell A2. 
    wsData.Range("A2").Select 
End Sub 

Answer 1

我选择使用ArrayList来存储客户。我把LastYear填满了去年的所有客户。如果今年的顾客去年购买我从LastYear中删除他们，并将其添加到BothYears其他我添加到ThisYear。

Sub CreateCustomerList() 
    Dim key 
    Dim LastYear As Object, ThisYear As Object, BothYears As Object 
    Set LastYear = CreateObject("System.Collections.ArrayList") 
    Set ThisYear = CreateObject("System.Collections.ArrayList") 
    Set BothYears = CreateObject("System.Collections.ArrayList") 


    With Worksheets("Sheet1") 

     For Each key In .Range("A3", .Range("A" & .Rows.Count).End(xlUp)).Value 
      If Not LastYear.Contains(key) Then LastYear.Add key 
     Next 

     For Each key In .Range("B3", .Range("B" & .Rows.Count).End(xlUp)).Value 
      If LastYear.Contains(key) Then 
       LastYear.Remove key 
       If Not BothYears.Contains(key) Then BothYears.Add key 
      Else 
       ThisYear.Add key 
      End If 
     Next 

     .Range("D3:F" & .Rows.Count).ClearContents 

     .Range("D3").Resize(LastYear.Count).Value = Application.Transpose(LastYear.ToArray) 
     .Range("E3").Resize(ThisYear.Count).Value = Application.Transpose(ThisYear.ToArray) 
     .Range("F3").Resize(BothYears.Count).Value = Application.Transpose(BothYears.ToArray) 

     .Columns.AutoFit 
    End With 

End Sub 

Answer 2

使用字典来保存值会更容易管理：没有必要继续调整，且已存在的方法可以很方便地比较值。

E.g.

Sub ListOperations() 

    Dim dLast, dThis, d, dEither, k 

    Set dLast = Dict(Range("A3")) 
    Set dThis = Dict(Range("B3")) 

    Set d = CreateObject("scripting.dictionary") 
    Set dEither = CreateObject("scripting.dictionary") 

    For Each k In dLast 
     If Not dThis.exists(k) Then d(k) = True 
     dEither(k) = True 
    Next k 
    DictToRange d, Range("D3") 'last year only 
    d.RemoveAll 

    For Each k In dThis 
     If Not dLast.exists(k) Then d(k) = True 
     dEither(k) = True 
    Next k 
    DictToRange d, Range("E3") 'This year only 
    d.RemoveAll 

    DictToRange dEither, Range("F3") 'either year 

End Sub 

'Utility: get a dictionary of all unique values, starting at cell cStart 
' until the last-occupied cell in that column 
Function Dict(cStart As Range) 
    Dim c As Range, rng As Range, d As Object 
    Set d = CreateObject("scripting.dictionary") 
    With cStart.Parent 
     Set rng = .Range(cStart, .Cells(.Rows.Count, cStart.Column).End(xlUp)) 
    End With 
    For Each c In rng.Cells 
     If c.Value <> "" Then d(c.Value) = True 
    Next c 
    Set Dict = d 
End Function 

'utility: populate a column with the keys of a dictionary, starting at rng 
Sub DictToRange(d, rng) 
    If d.Count = 0 Then Exit Sub 
    rng.Resize(d.Count, 1).Value = Application.Transpose(d.keys) 
End Sub