.net 递增文件名时出现问题
可能重复:.net 递增文件名时出现问题,.net,vb.net,.net,Vb.net,可能重复: 请查看以下代码: Dim counter As Integer = 0 While System.IO.File.Exists("C:\Desktop\Sample.xls") counter = counter + 1 Dim fileName As String = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(newfile), counter.ToStri
请查看以下代码:
Dim counter As Integer = 0
While System.IO.File.Exists("C:\Desktop\Sample.xls")
counter = counter + 1
Dim fileName As String = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(newfile), counter.ToString(), System.IO.Path.GetExtension(newfile))
newfile = System.IO.Path.Combine(ProcessedView.processedPath, fileName)
End While
如果文件存在,新文件名将为Sample(1).xls
。到目前为止,它运行良好。如果文件名本身是Sample(1).xls
,则新文件名应该是Sample(2).xls
。但在这段代码中,我得到的是示例(1)(2).xls
如何避免这个问题?有什么建议吗?请试试这个
Dim counter As Integer = 0
While System.IO.File.Exists("C:\Desktop\Sample.xls")
counter = counter + 1
Dim fileName As String = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(Mid(newfile, 1, InStr(newfile, "(") - 1)), counter.ToString(), System.IO.Path.GetExtension(newfile))
newfile = System.IO.Path.Combine(ProcessedView.processedPath, fileName)
End While
原因是您需要在第一次传递时获取不带扩展名的文件名,而不包含括号中的内容
(####)
,在这一行:
newfile = System.IO.Path.Combine(ProcessedView.processedPath, fileName)
newfile
将是示例(1).xls
。然后当你用
System.IO.Path.GetFileNameWithoutExtension(newfile)
它将返回格式字符串中的sample(1)
,它是{1}
,然后在循环的第二个过程中添加({2})
,它是2
,这就使得sample(1)(2)
要解决此问题,您不需要一直将(x)添加到文件名中,如下所示:
Dim counter As Integer = 0
Dim origfile As String = "C:\Desktop\Sample.xls"
Dim newfile As String = origfile
While System.IO.File.Exists(newfile)
counter = counter + 1
newfile = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(newfile), counter.ToString(), System.IO.Path.GetExtension(newfile))
End While
use newfile instead of origfile
行中的原始代码中还有另一个问题
While System.IO.File.Exists("C:\Desktop\Sample.xls")
因为如果C:\Desktop\Sample.xls
存在,它将导致无限循环。逻辑可以是:
Dim counter As Integer = 0
Dim testFileName as String = "Sample"
Dim searchFileName as String = testFileName
While System.IO.File.Exists("C:\Desktop\" & searchFileName & ".xls")
counter = counter + 1
searchFileName = testFileName & "(" & counter & ")"
End While
Dim fileName As String = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(newfile), counter.ToString(), System.IO.Path.GetExtension(newfile))
newfile = System.IO.Path.Combine(ProcessedView.processedPath, fileName)
您也可以这样做:
Dim counter As Integer = 0
Dim newFileName As String = orginialFileName
While File.Exists(newFileName)
counter = counter + 1
newFileName = String.Format("{0}({1}", orginialFileName, counter.ToString())
End While
试试这个
Dim counter As Integer = 0
Dim tempBaseFile As String = "C:\Desktop\Sample.xls"
Dim newFile As String = tempBaseFile
While System.IO.File.Exists(newFile)
counter = counter + 1
Dim fileName As String = String.Format("{0}({1}){2}", System.IO.Path.GetFileNameWithoutExtension(tempBaseFile), counter.ToString(), System.IO.Path.GetExtension(newFile))
newFile = System.IO.Path.Combine(ProcessedView.processedPath, fileName)
End While
可能的副本: