excel - ActiveCell.Offset() 和 Range() 之间的速度差异？

Question

摘要:我遍历多行数据，每次通过循环将来自不同列的数据存储在大约 6 个不同的变量中

问题:我会使用 Range("A" & some iterator) 节省大量的 CPU 周期吗？而不是 ActiveCell.Offset(some number) ?一个比另一个快多少？

提前致谢!

Answer 1

出于纯粹的无聊和一点好奇，我为各种方法组合了一个粗略的计时器来循环 100,000 个 Excel 单元格。

理想情况下，您应该每次运行多次并取平均值，但它会给您一个粗略的速度轮廓。

在我的机器上，这就是我得到的

Option Explicit

#If Win64 Then
    Public Declare PtrSafe Function GetTickCount Lib "kernel32" () As Long
#Else
    Public Declare Function GetTickCount Lib "kernel32" () As Long
#End If

Sub TestSpeedofReadingCells()
Dim tcStart As Long
Dim tcEnd As Long
Dim temp As Variant

Dim i As Long
Dim rngobject As Range
Dim rngItem As Range
Dim rngArray() As Variant
Const rowsToRead As Long = 100000


    '***Read individual cells using .Range
    With Sheet1
        tcStart = GetTickCount
        For i = 1 To rowsToRead
            temp = .Range("A" & i).Value
        Next i
        tcEnd = GetTickCount
        Debug.Print "Time1: " & tcEnd - tcStart
    End With

    '***Read individual cells using .Range & screenupdating off
    With Sheet1
        Application.ScreenUpdating = False
        tcStart = GetTickCount
        For i = 1 To rowsToRead
            temp = .Range("A" & i).Value
        Next i
        tcEnd = GetTickCount
        Application.ScreenUpdating = True
        Debug.Print "Time1a: " & tcEnd - tcStart
    End With

    '***Read individual cells using .Range & screenupdating off & using value2
    With Sheet1
        Application.ScreenUpdating = False
        tcStart = GetTickCount
        For i = 1 To rowsToRead
            temp = .Range("A" & i).Value2
        Next i
        tcEnd = GetTickCount
        Application.ScreenUpdating = True
        Debug.Print "Time1b: " & tcEnd - tcStart
    End With

    '***Read individual cells using range object
    With Sheet1
        Set rngobject = .Range("A1:A" & rowsToRead)
        tcStart = GetTickCount
        For Each rngItem In rngobject
            temp = rngItem
        Next rngItem
        tcEnd = GetTickCount
        Debug.Print "Time2: " & tcEnd - tcStart
    End With

    '***Read individual cells using activecell
    With Sheet1
        tcStart = GetTickCount
        .Range("A1").Select
        For i = 1 To rowsToRead
            temp = ActiveCell.Offset(i - 1, 0).Value
        Next i
        tcEnd = GetTickCount
        Debug.Print "Time3: " & tcEnd - tcStart
    End With

    '***Read individual cells using activecell & screenupdating off
    With Sheet1
        Application.ScreenUpdating = False
        tcStart = GetTickCount
        .Range("A1").Select
        For i = 1 To rowsToRead
            temp = ActiveCell.Offset(i - 1, 0).Value
        Next i
        tcEnd = GetTickCount
        Application.ScreenUpdating = True
        Debug.Print "Time3a: " & tcEnd - tcStart
    End With

    '***Read individual cells using array
    With Sheet1
        tcStart = GetTickCount
        rngArray = .Range("A1:A" & rowsToRead).Value
        For i = 1 To rowsToRead 'should really use Lbound to Ubound but only example
            temp = rngArray(i, 1)
        Next i
        tcEnd = GetTickCount
        Debug.Print "Time4: " & tcEnd - tcStart
    End With

End Sub