Question

ASP/VB.NET Check if File exists

Asked by: dougfosterNYC

I'm just beginning with .NET, obviously, and can't find what must be very simple..... Checking if a file exists.  I don't know what namespace I need open and I can't figure out what function will get me there.  I also would love to get the name of the server.  

Thanks.

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Asked On
2004-07-23 at 06:00:15ID21069007
Tags

file

,

check

,

exists

Topic

Microsoft Visual Basic.Net

Participating Experts
6
Points
125
Comments
8

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Answers

 

by: planoczPosted on 2004-07-23 at 06:05:05ID: 11620885

Hi dougfosterNYC,

Here is where I found a good examples for a starting new in VB.Net
.....http://msdn.microsoft.com/vbasic/downloads/samples/101samples.aspx

Link for ASP programs...

http://msdn.microsoft.com/asp.net/downloads/kits/default.aspx

 

by: DotNetLover_BaanPosted on 2004-07-23 at 06:22:07ID: 11621013

Hi there,
nice link for file I/O operations..
http://support.microsoft.com/?kbid=304427

Namespace required:  System.IO
-Baan

 

by: iboutchkinePosted on 2004-07-23 at 06:38:16ID: 11621173

Imports System.IO

Then, you can use the shared Exists() method to look for a specific file. With
the File class, you pass in the path as a string, like so:

If File.Exists("c:\myfile.txt") Then
'do something  
Else
'do something  
End If


or

this procedure with the FileInfo class. This time we need to
explicitly create the class instance, as seen here:
 
Dim MyFile As New FileInfo("c:\myfile.txt")
If MyFile.Exists() Then
'do something  
Else
'do something  
End If

This time, the Exists() method didn't require the filename as a parameter
because the object itself points to the appropriate file.

 

by: dougfosterNYCPosted on 2004-07-23 at 06:39:03ID: 11621184

Thanks guys.  This is helpful.  I'm not sure why I couldn't find anything good.

 

by: kennethscffPosted on 2005-02-08 at 07:41:56ID: 13255063

Hi I'm using the file.exists method to check if a file is there which works fine on my local drive but fails on a network drive.

Is this a security issue and if so how would I solve it?

 

by: mrRecNeps1Posted on 2005-06-19 at 23:13:44ID: 14254534

iboutchkine answer is right.... but doesn't work for a network drive...

Anybody found a solution for kennethscff ?
I am sitting with the same problem....

Eg: File.exists("\\MyServer\MyShare\MyTestFile.txt")
Always returns false...

Even using the FileInfo class, I get the same result

 

by: mrRecNeps1Posted on 2005-06-20 at 00:39:38ID: 14254812

Okay...

BUG:
Theortically, when calling a Network File, the Exists() method should return a Security ACCESS error ~ this should be documented as a .NET bug

REASON:
ASPNET accounts usually dont get setup with network rights.

SOLUTION:
1. Make sure your ASPNET account has permissions on your network!
=> IMPERSONATION:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp
conaspnetimpersonation.asp

SOURCE OF MY FINDINGS & DRAWING TO A CONCLUSION:
http://support.microsoft.com/default.aspx?scid=kb;en-us;307901&Product=aspnet

 

by: OmerFarukZPosted on 2008-08-01 at 00:41:23ID: 22136178

add your webconfig or appconfig
<impersonate = "true">

and add your machineconfig
<impersonate = "false">

you are now using local permissions with file.exist("c:\inetpub\wwroot\site\files\itsfrom.zip)

20120131-EE-VQP-002

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