我需要将一些CSV导入Excel电子表格,每个CSV的行/列号都不同。问题是某些值是长数字字符串,如
341235387313289173719237217391
,
Excel会将这些值视为(双)数字,然后导致数据丢失。
我的解决方法是使用以下vba函数来完成这项工作:
Sub readCSV(f As TextStream, sh As Worksheet)
i = 1
Do
l = Trim(f.ReadLine)
If l = "" Then Exit Sub 'skip the last empty line(s)
l = Mid(l, 2, Len(l) - 1)
ss = Split(l, """,""")
For j = LBound(ss) To UBound(ss) 'j starts from 0
Dim a As Range
With sh.Cells(i, j + 1)
.NumberFormat = "@" 'Force to text format
.Value = ss(j)
End With
DoEvents 'Avoid blocking the GUI
Next j
i = i + 1
Loop Until f.AtEndOfStream
End Sub
问题在于性能。它比通过Data-> From Text导入数据要慢得多,或者只是直接打开CSV。
有没有办法更有效地做到这一点?
答案 0 :(得分:2)
您可以一次性格式化/写入每一行:
Sub readCSV(f As TextStream, sh As Worksheet)
Dim i As Long
Dim ss, l
i = 1
With Application
.ScreenUpdating = False
.Calculation = xlCalculationManual
End With
Do
l = Trim(f.ReadLine)
If l = "" Then Exit Sub 'skip the last empty line(s)
l = Mid(l, 2, Len(l) - 1)
ss = Split(l, """,""")
With sh.Cells(i, 1).Resize(1, (UBound(ss) - LBound(ss)) + 1)
If (i-1) Mod 100 = 0 Then .Resize(100).NumberFormat = "@"
.Value = ss
End With
i = i + 1
Loop Until f.AtEndOfStream
With Application
.ScreenUpdating = True
.Calculation = xlCalculationAutomatic
End With
End Sub
编辑:经过测试,真正的性能杀手是将单元格格式设置为文本修订代码,将其设置为100行而不是每行。
答案 1 :(得分:1)
您可以使用Regexp
快速创建CSV文件的第二个版本,而不是使用前一个{{1}更新超过16个字符的alpantring of alpanumerics,而不是在Excel中工作(按单元格或按行) }
然后只需在Excel中导入或打开整个新的csv
在CSV文件'
上运行的示例代码,示例为StrIn
"c:\Temp\test.csv"
答案 2 :(得分:0)
尝试.Value = "'" & ss(j)
'
强制值在Excel中显示为文本字符串。
另外,尝试在字符串中声明你的ss数组,这样它就不会在分割后存储数字。类似的东西:
Dim ss() as String = Split(l, """,""")