对于Loop VBA通​​过放入数组来加速

Question

我试图遍历大约2000行的数据，并执行for循环和每个循环中的多个if语句。它可以工作，但现在速度很慢。从我的研究中可以了解到，如果我可以将数据放入数组中并在其中进行处理，然后再将数据放回单元中，则速度会更快，但是我可以在编码方面使用一些帮助。这是我的代码。

Sub EliminateVariance()

    Dim Old As Long
    Dim Older As Long
    Dim Oldest As Long
    Dim Current As Long
    Dim VarianceOld As Long
    Dim VarianceNew As Long
    Dim VarianceNew1 As Long
    Dim VarianceNew2 As Long
    Dim Month1 As Variant
    Dim SheetName As Variant
    Dim LastRow As Long
    Dim i As Long

    Month1 = InputBox("What is this month?")

    SheetName = Month1 & " SummaryByCust"

    Worksheets(SheetName).Activate

    LastRow = Cells(Rows.count, "B").End(xlUp).row

    For i = 3 To LastRow
        VarianceOld = Range("V" & i)
        Oldest = Range("I" & i)
        Older = Range("H" & i)
        Old = Range("G" & i)
        Current = Range("F" & i)

        If VarianceOld > Oldest Then
            VarianceNew = VarianceOld - Oldest
            Range("I" & i) = 0
            If VarianceNew > Older Then
                VarianceNew1 = VarianceNew - Older
                Range("H" & i) = 0
                If VarianceNew1 > Old Then
                    VarianceNew2 = VarianceNew1 - Old
                    Range("G" & i) = 0
                    If VarianceNew2 > Current Then
                        MsgBox ("Error: Deferred is greater than what it should be. Verify your numbers")
                    Else
                        Range("F" & i) = Current - VarianceNew2
                    End If
                Else
                    Range("G" & i) = Old - VarianceNew1
                End If
            Else
                Range("H" & i) = Older - VarianceNew
            End If
        Else
            Range("I" & i) = Oldest - VarianceOld
        End If
    Next i

End Sub

Answer 1

以下是有关如何使用数组的示例：

Sub arrayEx()

'Set the range
Dim rng As Range
Set rng = Worksheets("Sheet1").Range("A1:B20000")

'Bulk load the values from the range into an array
'Even if a single column this will create a 2D array
Dim rngArr As Variant
rngArr = rng.Value

'Loop the "Rows" of the array
Dim i As Long
For i = LBound(rngArr, 1) To UBound(rngArr, 1)
    'Do something with that array
    'when loaded from a range it is similar nomenclature to Cells: array(row,column)
    If rngArr(i, 1) = "A" Then
        rngArr(i, 2) = "B"
    End If
Next i

'overwrite the values in range with the new values from the array.
rng.Value = rngArr

End Sub

尝试适应您的需求。