我有2个名为“Source1”和“Source2”的工作簿。
对于“Source1”的最后一列中的每个单元格，我检查它是否存在于“Source2”的最后一列中。
如果是，那么我将基于某些critea的4行单独的单元格复制到名为“Target”的新工作簿中。
我的宏正在工作，但由于我有数以千计的细胞循环，所以我需要至少10分钟直到宏完成。我每天都运行很多次，所以我想优化我的代码，以便花费更少的时间。
这是我的代码
Sub Loop_Cells()
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Application.SheetsInNewWorkbook = 1
Dim Source, Source2, Target As Workbook
Dim c As Range
Dim lRow, lRow2 As Long
Dim x, y, w As Integer
Set Source = Workbooks.Open("C:\Reports\Source1.xlsx")
Source.Activate
x = ActiveSheet.UsedRange.Columns.Count
ActiveSheet.Cells(1, x + 1) = "Concate"
lRow = ActiveSheet.Range("A" & Rows.Count).End(xlUp).Row
For i = 2 To lRow
ActiveSheet.Cells(i, x + 1).Value = ActiveSheet.Cells(i, 6).Value & ActiveSheet.Cells(i, 7).Value
Next i
ActiveSheet.Columns(x + 1).NumberFormat = "0"
Set Source2 = Workbooks.Open("C:\Reports\Source2.xlsx")
Source2.Activate
y = ActiveSheet.UsedRange.Columns.Count
ActiveSheet.Cells(1, y + 1) = "Concate"
lRow2 = ActiveSheet.Range("A" & Rows.Count).End(xlUp).Row
For i = 2 To lRow2
ActiveSheet.Cells(i, y + 1).Value = ActiveSheet.Cells(i, 48).Value & ActiveSheet.Cells(i, 3).Value
Next i
ActiveSheet.Columns(y + 1).NumberFormat = "0"
Set Target = Workbooks.Add
Target.Sheets(1).Name = "ExistCells"
Source.Sheets(1).Activate
w = 1
For Each c In Source1.Sheets(1).UsedRange.Columns(x + 1).Cells
For j = 2 To lRow2
If c.Value = Source2.Sheets(1).Cells(j, y + 1).Value Then
Target.Sheets(1).Cells(w, 1).Value = Source2.Sheets(1).Cells(j, 48).Value
Target.Sheets(1).Cells(w, 2).Value = Source2.Sheets(1).Cells(j, 3).Value
Target.Sheets(1).Cells(w, 3).Value = Source2.Sheets(1).Cells(j, 27).Value
Target.Sheets(1).Cells(w, 4).Value = Source2.Sheets(1).Cells(j, 41).Value
w = w + 1
End If
Next j
Next c
Workbooks("Source1.xlsx").Close SaveChanges:=False
Workbooks("Source1.xlsx").Close SaveChanges:=False
Target.Activate
ActiveWorkbook.SaveAs FileName:= "C:\Reports\Target.xlsx", _
FileFormat:=xlOpenXMLWorkbook, CreateBackup:=False
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub
我认为问题出在这一部分，当单元格存在时，我不需要循环到最后一行，我应该移动到下一行。
对于j = 2到lRow2
如果c.Value = Source2.Sheets（1）.Cells（j，y + 1）.Value那么......
任何建议如何调整我的代码？
答案 0 :(得分：1)
集合针对快速查找进行了优化。因此，它们在匹配值时非常理想。
考虑匹配两个列表，每个列表包含1000个值。假设平均而言，您会在列表的一半找到匹配，即500（1000 * 1000）或500K操作。使用Collection会将数量减少到1000次迭代+ 1000次查找。假设每次查找需要1到10次操作（只是一个猜测），那么你将减少将两个1000个元素列表从500K到6K进行比较所需的操作次数。
找到匹配项后，您将4个值写入新工作表。让我们假设您找到了1000个匹配项，即对工作表进行了4000次写入操作。如果是instaed，则将这些值保存在数组中，然后将数组写入工作表，以便将写入操作（到工作表）的数量从400减少到1。
Sub NewLoop()
Application.ScreenUpdating = False
Application.SheetsInNewWorkbook = 1
Dim data As Variant, result As Variant
Dim lastRow As Long, x As Long, x1 As Long
Dim key As String
Dim list As Object
Set list = CreateObject("System.Collections.ArrayList")
With Workbooks.Open("C:\Reports\Source1.xlsx")
With .Worksheets(1)
data = .Range("F2:G" & .Range("A" & Rows.Count).End(xlUp).Row).Value
For x = 1 To UBound(data, 1)
'Create a Unique Identifier using a pipe to delimit the data
'This will keep the data from mixing
key = data(x, 1) & "|" & data(x, 2)
If Not list.Contains(key) Then list.Add key
Next
End With
.Close SaveChanges:=False
End With
With Workbooks.Open("C:\Reports\Source2.xlsx")
With .Worksheets(1)
lastRow = .Range("A" & Rows.Count).End(xlUp).Row
ReDim result(1 To lastRow, 1 To 4)
For x = 2 To lastRow
'Create a Unique Identifier using a pipe to delimit the data
'This will keep the data from mixing
key = .Cells(i, 48).Value & "|" & .Cells(i, 3).Value
If list.Contains(key) Then
x1 = x1 + 1
result(x1, 1) = .Cells(j, 48).Value
result(x1, 2) = .Cells(j, 3).Value
result(x1, 3) = .Cells(j, 27).Value
result(x1, 4) = .Cells(j, 41).Value
End If
Next
End With
.Close SaveChanges:=False
End With
With Workbooks.Add
With Worksheets(1)
.Name = "ExistCells"
.Range("A1:D1").Resize(x1).Value = Results
End With
End With
Application.ScreenUpdating = True
End Sub
答案 1 :(得分：0)
从你的最后一点开始，你是否可以在满足If条件时退出循环？比如这样的东西？
For j = 2 To lRow2
If c.Value = Source2.Sheets(1).Cells(j, y + 1).Value Then
Target.Sheets(1).Cells(w, 1).Value = Source2.Sheets(1).Cells(j, 48).Value
Target.Sheets(1).Cells(w, 2).Value = Source2.Sheets(1).Cells(j, 3).Value
Target.Sheets(1).Cells(w, 3).Value = Source2.Sheets(1).Cells(j, 27).Value
Target.Sheets(1).Cells(w, 4).Value = Source2.Sheets(1).Cells(j, 41).Value
w = w + 1
GoTo ExitLoop
End If
Next j
ExitLoop:
答案 2 :(得分：0)
代码可以清理一下......再加上你关闭“Source1.xlsx”两次......并试图将Source1称为变量，即使它从未被声明过。使用模块顶部的Option Explicit可以轻松找到问题类型。我在像Wilson88这样的内部For循环中也有类似的突破。
通过使用您的变量和With，您应该能够加快ActiveWorkbook和ActiveSheet ...
Sub Loop_Cells()
Dim Source As Workbook, Source2 As Workbook, Target As Workbook
Dim w As Integer, x As Integer, y As Integer
Dim lRow As Long, lRow2 As Long
Dim c As Range
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Application.SheetsInNewWorkbook = 1
Set Source = Workbooks.Open("C:\Reports\Source1.xlsx")
With Source
x = .UsedRange.Columns.Count
.Cells(1, x + 1) = "Concate"
lRow = .Range("A" & Rows.Count).End(xlUp).Row
For i = 2 To lRow
.Cells(i, x + 1) = .Cells(i, 6). & .Cells(i, 7)
Next i
.Columns(x + 1).NumberFormat = "0"
End With
Set Source2 = Workbooks.Open("C:\Reports\Source2.xlsx")
With Source2
y = .UsedRange.Columns.Count
.Cells(1, y + 1) = "Concate"
lRow2 = .Range("A" & Rows.Count).End(xlUp).Row
For i = 2 To lRow2
.Cells(i, y + 1). = .Cells(i, 48) & .Cells(i, 3)
Next i
.Columns(y + 1).NumberFormat = "0"
End With
Set Target = Workbooks.Add
With Target.Sheets(1)
.Name = "ExistCells"
w = 1
For Each c In Source.Sheets(1).UsedRange.Columns(x + 1).Cells
For j = 2 To lRow2
If c.Value = Source2.Sheets(1).Cells(j, y + 1) Then
.Cells(w, 1).Value = Source2.Sheets(1).Cells(j, 48)
.Cells(w, 2).Value = Source2.Sheets(1).Cells(j, 3)
.Cells(w, 3).Value = Source2.Sheets(1).Cells(j, 27)
.Cells(w, 4).Value = Source2.Sheets(1).Cells(j, 41)
w = w + 1
Exit For
End If
Next j
Next c
End With
Source.Close SaveChanges:=False
Source2.Close SaveChanges:=False
Target.SaveAs FileName:= "C:\Reports\Target.xlsx", _
FileFormat:=xlOpenXMLWorkbook, CreateBackup:=False
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub