加快VBA代码运行速度更快

时间:2017-06-26 15:47:10

标签: vba performance excel-vba excel

我有一个Excel工作簿,用户可以通过单击按钮导入文本文件。我的代码完全按照我的需要工作,但填写H列,阅读日期时速度非常慢。以下是将文本文件导入Excel工作表时Excel工作簿的外观: enter image description here

这是我的代码:

Sub Import_Textfiles()
Dim fName As String, LastRow As Integer

Worksheets("Data Importation Sheet").Activate

LastRow = Range("A" & Rows.Count).End(xlUp).Row + 1
    ' Finds the first blank row to import text file data to
fName = Application.GetOpenFilename("Text Files (*.txt), *.txt")

If fName = "False" Then Exit Sub

  With ActiveSheet.QueryTables.Add(Connection:="TEXT;" & fName, _
        Destination:=Range("A" & LastRow))
        .Name = "2001-02-27 14-48-00"
        .FieldNames = True
        .RowNumbers = False
        .FillAdjacentFormulas = False
        .PreserveFormatting = True
        .RefreshOnFileOpen = False
        .RefreshStyle = xlInsertDeleteCells
        .SavePassword = False
        .SaveData = True
        .AdjustColumnWidth = False
        .RefreshPeriod = 0
        .TextFilePromptOnRefresh = False
        .TextFilePlatform = 437
        .TextFileStartRow = 2
        .TextFileParseType = xlFixedWidth
        .TextFileTextQualifier = xlTextQualifierDoubleQuote
        .TextFileConsecutiveDelimiter = False
        .TextFileTabDelimiter = True
        .TextFileSemicolonDelimiter = False
        .TextFileCommaDelimiter = False
        .TextFileSpaceDelimiter = False
        .TextFileColumnDataTypes = Array(1, 1, 1, 1, 1, 1, 1)
        .TextFileFixedColumnWidths = Array(14, 14, 8, 16, 12, 14)
        .TextFileTrailingMinusNumbers = True
        .Refresh BackgroundQuery:=False
    End With
    ActiveWindow.SmallScroll Down:=0


    Dim strShortName As String


    'Adding Reading Date to Excel Sheet:
    Dim rowCount As Integer, currentRow As Integer
    Dim sourceCol As Integer, nextCol As Integer
    Dim currentRowValue As String
    Dim fileDate1 As String
    Dim fileDate2 As String

    sourceCol = 1 'columnA
    nextCol = 8 'column H
    rowCount = Cells(Rows.Count, sourceCol).End(xlUp).Row

    strShortName = fName
    fileDate1 = Mid(fName, InStrRev(fName, "\") + 1)
    fileDate2 = Left(fileDate1, 10)

    Cells(LastRow, 9) = ("Updating Location: " & strShortName)

    For currentRow = 1 To rowCount
        currentRowValue = Cells(currentRow, nextCol).Value
        If currentRowValue = "" Then
        Cells((currentRow), (nextCol)).Select
        Cells((currentRow), (nextCol)) = fileDate2
        End If
    Next

End Sub

如果有人对如何加快阅读日期的输入有任何建议,我会非常感激!提前谢谢!

3 个答案:

答案 0 :(得分:2)

我注意到的一些事情

  1. 正如Chris在评论中提到的那样,您可以关闭屏幕更新并将计算设置为手动并重新打开它们,并在代码结束时将计算设置为自动。
  2. 例如

    With Application
        .ScreenUpdating = False
        .Calculation = xlCalculationManual
    End With
    
    '
    '~~> Rest of your code
    '
    With Application
        .ScreenUpdating = True
        .Calculation = xlCalculationAutomatic
    End With
    
    1. 避免使用.Select。它降低了代码的速度。您无需选择要写入的单元格。
    2. 您的For循环可以写为。

      For currentRow = 1 To RowCount
          If Cells(currentRow, nextCol).Value = "" Then
              Cells(currentRow, nextCol).Value = fileDate2
          End If
      Next
      

      这样可以提高代码的速度,因为在写入代码之前不再选择单元格。

      1. 理想情况下,我会将范围复制到数组,然后执行您对数组所做的操作,然后将其写回单元格,但那就是我。

      2. 删除不必要的代码行。

      3. 。{/ 1>}
      4. 使用对象并完全限定对象。

      5. 使用Excel行时,请使用ActiveWindow.SmallScroll Down:=0代替Long

答案 1 :(得分:0)

试试这个:

Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
Application.EnableEvents = False

YOUR CODE HERE

Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
Application.EnableEvents = True

答案 2 :(得分:0)

最佳解决方案取决于一些事情,我从提供的数据中无法清楚。以下更改将加速它(选择单元格需要花费很多时间),但它不是最佳的。如果它仍然变慢,请提供〜行数和〜%行(在H列中),在您到达以下代码之前填充这些行。然后搜索缺失值或(可能在大多数情况下)将列H复制到数组中并在更新值后复制回来将会起到作用。

旧代码:

For currentRow = 1 To rowCount
    currentRowValue = Cells(currentRow, nextCol).Value
    If currentRowValue = "" Then
    Cells((currentRow), (nextCol)).Select
    Cells((currentRow), (nextCol)) = fileDate2
    End If
Next

新代码:

For currentRow = 1 To rowCount
    if Cells(currentRow, nextCol).Value = "" then
        Cells(currentRow,nextCol).Value = fileDate2
    End If
Next
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