Bugs with File.Exists()?

[Alex Chan]

Hi Group,

I encountered something strange with File.Exists(str ing path). This
function is simply to check whether a file exists in certain path. However,
if the path starts with "file:\" in the begining of the string, no matter
the file exists or not. it will return false without any exception. It is
expected?

Regards,
Alex

[ESPN Lover]

I'm curious. What version of windows os allows you have "file" as a drive
letter?

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. ..

Hi Group,

I encountered something strange with File.Exists(str ing path). This
function is simply to check whether a file exists in certain path. However, if the path starts with "file:\" in the begining of the string, no matter
the file exists or not. it will return false without any exception. It is
expected?

Regards,
Alex

[Alex Chan]

Nope. for example, the path like that "file:\c:\temp\ foo.txt" will return
false in every case, while "c:\temp\foo.tx t" wont
"ESPN Lover" <es**@lover.com > wrote in message
news:eD******** ******@TK2MSFTN GP11.phx.gbl...

I'm curious. What version of windows os allows you have "file" as a drive
letter?

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. ..

Hi Group,

I encountered something strange with File.Exists(str ing path). This
function is simply to check whether a file exists in certain path.

However,

if the path starts with "file:\" in the begining of the string, no matter the file exists or not. it will return false without any exception. It is expected?

Regards,
Alex

[ESPN Lover]

So then what's the issue? If you're checking for a malformed file path, you
should get false. Simply strip off the file:\ from your string

Try this:
if (p.IndexOf(@"fi le:\") == 0)

p = p.Substring(6);

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:em******** ******@TK2MSFTN GP12.phx.gbl...

Nope. for example, the path like that "file:\c:\temp\ foo.txt" will return
false in every case, while "c:\temp\foo.tx t" wont
"ESPN Lover" <es**@lover.com > wrote in message
news:eD******** ******@TK2MSFTN GP11.phx.gbl...

I'm curious. What version of windows os allows you have "file" as a drive

letter?

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. ..

Hi Group,

I encountered something strange with File.Exists(str ing path). This function is simply to check whether a file exists in certain path.

However,

if the path starts with "file:\" in the begining of the string, no

matter the file exists or not. it will return false without any exception. It is expected?

Regards,
Alex

[Alex Chan]

Hi,

The reason why i felt that strange is the "file:\" is come with
Path.GetDirecto ryName. My idea is to determine the location of the config
file storing in the current path of the executable through the following

szConfigFileNam e=
Path.GetDirecto ryName(Assembly .GetExecutingAs sembly().CodeBa se) +
"\\Config.x ml";

For this, you will get the path starting with "file:\", and i check that
with File.Exists before opening the file, it always return false and none of
the settings got read.

Actually your suggestion is what i am using.

Regards,

Alex

"ESPN Lover" <es**@lover.com > wrote in message
news:uF******** ******@TK2MSFTN GP11.phx.gbl...

So then what's the issue? If you're checking for a malformed file path, you should get false. Simply strip off the file:\ from your string

Try this:
if (p.IndexOf(@"fi le:\") == 0)

p = p.Substring(6);

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:em******** ******@TK2MSFTN GP12.phx.gbl...

Nope. for example, the path like that "file:\c:\temp\ foo.txt" will return

false in every case, while "c:\temp\foo.tx t" wont
"ESPN Lover" <es**@lover.com > wrote in message
news:eD******** ******@TK2MSFTN GP11.phx.gbl...

I'm curious. What version of windows os allows you have "file" as a drive letter?

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP14.phx.gbl. ..
> Hi Group,
>
> I encountered something strange with File.Exists(str ing path). This > function is simply to check whether a file exists in certain path.
However,
> if the path starts with "file:\" in the begining of the string, no

matter

> the file exists or not. it will return false without any exception.

It is

> expected?
>
> Regards,
> Alex
>
>

[David McClarnon]

Alex Chan wrote:

Hi,

The reason why i felt that strange is the "file:\" is come with
Path.GetDirecto ryName. My idea is to determine the location of the config
file storing in the current path of the executable through the following

szConfigFileNam e=
Path.GetDirecto ryName(Assembly .GetExecutingAs sembly().CodeBa se) +
"\\Config.x ml";

For this, you will get the path starting with "file:\", and i check that
with File.Exists before opening the file, it always return false and none of
the settings got read.

Actually your suggestion is what i am using.

Regards,

Alex

"ESPN Lover" <es**@lover.com > wrote in message
news:uF******** ******@TK2MSFTN GP11.phx.gbl...

So then what's the issue? If you're checking for a malformed file path,

you

should get false. Simply strip off the file:\ from your string

Try this:
if (p.IndexOf(@"fi le:\") == 0)

p = p.Substring(6);

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:em****** ********@TK2MSF TNGP12.phx.gbl. ..

Nope. for example, the path like that "file:\c:\temp\ foo.txt" will
return
false in every case, while "c:\temp\foo.tx t" wont
"ESPN Lover" <es**@lover.com > wrote in message
news:eD***** *********@TK2MS FTNGP11.phx.gbl ...

I'm curious. What version of windows os allows you have "file" as a

drive

letter?

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:%2**** ************@TK 2MSFTNGP14.phx. gbl...

>Hi Group,
>
> I encountered something strange with File.Exists(str ing path).

This

>function is simply to check whether a file exists in certain path.

However,

>if the path starts with "file:\" in the begining of the string, no

matter

>the file exists or not. it will return false without any exception.
It
is

>expected ?
>
> Regards,
>Alex
>
>

Sounds like you're using remoting.

System.IO.File. Exists works on the local machine only. It works the same
way as any other file on a local machine e.g. "c:\hello.t xt"

You MUST be doing something using remoting otherwise it will return the
path on the local machine.

If not you are doing something so strange that I've yet to meet it.

Darwen.

[James Curran]

"Alex Chan" <Ga********@hot mail.com> wrote in message
news:uX******** ******@TK2MSFTN GP10.phx.gbl...

szConfigFileNam e=
Path.GetDirecto ryName(Assembly .GetExecutingAs sembly().CodeBa se) +
"\\Config.x ml";

I believe for this, yo'd want:

szConfigFileNam e=

Path.GetDirecto ryName(Server.M apPath(Assembly .GetExecutingAs sembly().CodeBa s
e)) +
"\\Config.x ml";

"file://" is a URL protocol, like "http://" or "ftp://". File.Exist doesn't
understand it. MapPath converts a URL address to a local disk address.

--
Truth,
James Curran
Home: www.noveltheory.com Work: www.njtheater.com
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