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Increment file name if it exists on file upload

Posted on 2012-04-05
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Last Modified: 2012-06-21
Hi

I am creating a video uploading website. I would like to avoid having files overwitten when they have the same file name. is there a way to automatically increment the filename if it exists?

My current code is just uploading:

Thanks

'declare the file path to store uploads
        Dim path As String = Server.MapPath("~/UploadedVideos/" & UserLogin.UserNo & "/")

        FileUploadVideo.PostedFile.SaveAs(path & FileUploadVideo.FileName)
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Question by:ntd1
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3 Comments
 
LVL 25

Expert Comment

by:kevp75
ID: 37813959
If IO.Exists(path & FileUploadVideo.FileName) Then
    FileUploadVideo.PostedFile.SaveAs(path & FileUploadVideo.FileName + 1)
Else
    FileUploadVideo.PostedFile.SaveAs(path & FileUploadVideo.FileName)
End If

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Personally I would generate a random string, and append it to the filename.  Lemme see if I can drum up something official :)
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LVL 25

Accepted Solution

by:
kevp75 earned 500 total points
ID: 37813991
See, I usually do something like this:
                    Dim sFileName As String = GenString() & System.IO.Path.GetFileName(FileUploadVideo.FileName)

If IO.Exists(path & FileUploadVideo.FileName) Then
    FileUploadVideo.PostedFile.SaveAs(path &  sFileName)
Else
    FileUploadVideo.PostedFile.SaveAs(path & FileUploadVideo.FileName)
End If
                                            

    Private Function GenString(Optional ByVal _MinLength As Integer = 4, Optional ByVal _MaxLength As Integer = 15) As String
        Dim _RandBytes(10) As Byte, _RetStr As String = String.Empty
        Dim _Seed As Integer = CType(Date.Now.Ticks And Integer.MaxValue, Integer)
        Dim _Rand As Random = New Random(_Seed)
        _Rand.NextBytes(_RandBytes)
        _RetStr = Convert.ToBase64String(_RandBytes).Substring(0, _Rand.Next(_MinLength, _MaxLength))
        _RetStr = _RetStr.Replace("+", String.Empty)
        _RetStr = _RetStr.Replace("/", String.Empty)
        _RetStr = _RetStr.Replace("=", String.Empty)
        Return _RetStr
        _Rand = Nothing : _Seed = 0 : Erase _RandBytes : _RetStr = String.Empty
    End Function

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Author Closing Comment

by:ntd1
ID: 37814191
Very Good.
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