How to know if a string is a guid

[ucasesoftware]

How to know if a string is a guid

thx

[Larry Lard]

ucasesoftware wrote:

How to know if a string is a guid

I suppose you culd try and construct a System.Guid from it, and see if
that throws a FormatException, but that's a little inelegant. Can't see
any other readily available method though.

--
Larry Lard
Replies to group please

[Herfried K. Wagner [MVP]]

"ucasesoftware" <uc***********@hotmail.fr> schrieb:

How to know if a string is a guid

For example:

\\\
Try
Dim g As New Guid(<string>)
Catch ex As FormatException
...
End Try
///

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

[Ken Tucker [MVP]]

Hi,

I would use an regular expression.

Dim regGuid As New
Regex("^\{?[a-fA-F\d]{8}-([a-fA-F\d]{4}-){3}[a-fA-F\d]{12}\}?$")

Dim strTest As String = Guid.NewGuid.ToString
Trace.WriteLine(regGuid.IsMatch(strTest))
Trace.WriteLine(regGuid.IsMatch("No way"))
Ken
------------------------
"ucasesoftware" <uc***********@hotmail.fr> wrote in message
news:11**********************@f14g2000cwb.googlegr oups.com...

How to know if a string is a guid

thx

[Jay B. Harlow [MVP - Outlook]]

ucasesoftware,
I would normally use the method Herfried suggests:

Try
Dim g As New Guid(<string>)
Catch ex As FormatException
...
End Try

I was going to suggest TryParse with VB 2005, however I don't see it listed
for Guid, just the "numeric" types (Integer, Long, Single, Double, Decimal,
DateTime...) possibly because Guid doesn't have a Parse function...

If I considered the RegEx approach as Ken suggests, I would be certain to
take into account all 5 formats that a GUID could be in:

http://msdn.microsoft.com/library/de...ctorTopic2.asp

Ergo I suspect the Try/Catch would be "easier" in the long run, although the
RegEx approach might be "Better" for dialog boxes...

--
Hope this helps
Jay
T.S. Bradley - http://www.tsbradley.net
"ucasesoftware" <uc***********@hotmail.fr> wrote in message
news:11**********************@f14g2000cwb.googlegr oups.com...
| How to know if a string is a guid
|
| thx
|

[Cor Ligthert [MVP]]

Jay,

I would normally use the method Herfried suggests:

Just before somebody gets wrong idea from you, from what I am sure is not
your intention.

In my opinion Larry and Hefried, they posted in my opinion at about the same
time almost the same solution.

Cor

[Jay B. Harlow [MVP - Outlook]]

Cor,
| Just before somebody gets wrong idea from you, from what I am sure is not
| your intention.
Huh?

| In my opinion Larry and Hefried, they posted in my opinion at about the
same
| time almost the same solution.
Yes Larry & Herfried gave the "same" technique, however only Herfried gave
sample code. I was giving Herfried credit for using his code.

--
Hope this helps
Jay
T.S. Bradley - http://www.tsbradley.net
"Cor Ligthert [MVP]" <no************@planet.nl> wrote in message
news:eb**************@TK2MSFTNGP12.phx.gbl...
| Jay,
|
| > I would normally use the method Herfried suggests:
| >
| Just before somebody gets wrong idea from you, from what I am sure is not
| your intention.
|
| In my opinion Larry and Hefried, they posted in my opinion at about the
same
| time almost the same solution.
|
| Cor
|
|

[ucasesoftware]

Thx for those answers...

As you are all very good, can you look at this thread :
http://groups.google.fr/group/micros...61763585f458b2

i have no answer and it's very important for me :)