Valid file name

[Jack Russell]

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Jack Russell]

Claes,

That works for some characters but not all ? and / are not valid but it
does not throw an exception for them.

Jack
Claes Bergefall wrote:

Try Path.GetFileNam e or Path.GetDirecto ryName (or both). Both will throw an
exception if invalid characters are found in the string. If you need a list
of invalid characters you can get them by using Path.GetInvalid FileNameChars
and Path.GetInvalid PathChars

/claes
"Jack Russell" <ja***@norubbis h.tpg.com.auwro te in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl...

>>Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Göran Andersson]

Use the array of invalid characters from the Path class:

If fileName.IndexO fAny(System.IO. Path.GetInvalid PathChars()) <-1 Then
Jack Russell wrote:

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Herfried K. Wagner [MVP]]

"Göran Andersson" <gu***@guffa.co mschrieb:

Use the array of invalid characters from the Path class:

If fileName.IndexO fAny(System.IO. Path.GetInvalid PathChars()) <-1 Then

ACK, but note that this won't guarantee the validity of the filename because
'GetInvalidPath Chars' doens't necessarily return all invalid path characters
and even a path that doesn't contain any of these characters still may not
be valid.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[C-Services Holland b.v.]

Göran Andersson wrote:

Use the array of invalid characters from the Path class:

If fileName.IndexO fAny(System.IO. Path.GetInvalid PathChars()) <-1 Then

This would qualify:
"c:\foo\::bar:\ d\\foo" as valid. The above method will only tell you if
it contains invalid characters, but it will not tell you if a path is
actually a valid path.

--
Rinze van Huizen
C-Services Holland b.v

[GhostInAK]

Hello Jack,

On XP SP1 or 2k3 there is: CheckNameLegalD OS8Dot3() exported by Kernel32.dll.
It obviously does not work on long filenames.. so don't forget about GetShortPathNam e()

-Boo

Adamz5 wrote:

>Okay here you go...
full code to check file name.
'place a textbox on form write text into it and then press button 1
'place this code in the button1_click event to check that the
filename entered in textbox 1 is fine

Dim uservalue As String
uservalue = TextBox1.Text
Dim b As Boolean = False
b = uservalue.Conta ins("/") Or uservalue.Conta ins("?") _
Or uservalue.Conta ins(":") _
Or uservalue.Conta ins("*") _
Or uservalue.Conta ins("""") _
Or uservalue.Conta ins("<") _
Or uservalue.Conta ins(">") _
Or uservalue.Conta ins("|") _
Or uservalue.Conta ins("?")
If b = False Then
MsgBox("Vali d Filename")
Else
MsgBox("Invali d Filename")
End If
By the way this is the long way (not that long is it?)

Anyway hope this helps

Regards

Adam

Yes that is basically what I did but knowing MS there are other things
that make a file name invalid so I thought there might be a system
function that checked all possibilities. Anyway thanks for everyones
thoughts.

Jack