CODEWITHSUNDEEP
.netvb.netwinforms
Michael
Michael

Reputation: 13626

How to create unique file name?

I copy image files from one folder to another with help of File.Copy() method.

I need to give unique file name to the copied image file before it is pasted to the folder.

Any idea how I can implement this?

Upvotes: 7

Views: 21813

Answers (5)

HackSlash
HackSlash

Reputation: 5813

I recommend using Path.GetRandomFileName().

The previously accepted answer was to use Path.GetTempFileName which creates a file. This is not ideal when that file is going to be the target of a file copy operation, as stated in the question.

Unlike GetTempFileName, GetRandomFileName does not create a file. When the security of your file system is paramount, this method should be used instead of GetTempFileName.

SOURCE: https://msdn.microsoft.com/en-us/library/system.io.path.getrandomfilename(v=vs.110).aspx

EXAMPLE:

Imports System.IO

Module Module1

    Sub Main()
        Dim fileName = Path.GetRandomFileName()
        Console.WriteLine("Random file name is " & fileName)
    End Sub

End Module

' This code produces output similar to the following:   
' Random file name is w143kxnu.idj

Upvotes: 3

Matt Wilko
Matt Wilko

Reputation: 27342

Eyossi's answer should be the accepted solution but another alternative:-

You could use a guid to create a unique name ("Such an identifier has a very low probability of being duplicated."):

Dim filename As String = Guid.NewGuid().ToString + ".png"

Upvotes: 6

ivanwong888899999
ivanwong888899999

Reputation: 155

Here's another way to do it

fileName = User_Appended_File_Name & "_" & DateTime.Now.ToString("yyyyMMdd_HH_mm_ss")

It would create a fairly identifiable File Name, with the added advantage of knowing when it was created, a big ol' timestamp.

edit: It will not work if the file saving rate is faster than 1second.

Upvotes: 4

eyossi
eyossi

Reputation: 4340

You can use Path.GetTempFileName

more info at: http://msdn.microsoft.com/en-us/library/system.io.path.gettempfilename(v=vs.100).aspx

a quote from the link:

"Creates a uniquely named, zero-byte temporary file on disk and returns the full path of that file."

Upvotes: 5

Krishanu Dey
Krishanu Dey

Reputation: 6406

You may use current date-time as the file name.

Upvotes: 0

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