Download file

[Leon Habinsky]

Hi guys,

I need to download a file over the Internet and I use the HttpWebRequest
class to accomplish this task. My problem is that, I need to know if the
file exists before issuing the GetResponse() call , because it throws
WebException. I can of course handle the exception but it's not the best way
for me to handle the logic of the my program. Is there any other ways to do
it?

Thanks in advance.
Leon.

[Nicholas Paldino [.NET/C# MVP]]

Leon,

You should be able to call GetResponse and get the HttpWebResponse from
it without an exception. Once you have it, you should be able to check the
StatusCode property to see if the file exists or not (if it doesn't, I
believe you will get a status code in the 400's).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:ut**************@TK2MSFTNGP12.phx.gbl...

Hi guys,

I need to download a file over the Internet and I use the HttpWebRequest
class to accomplish this task. My problem is that, I need to know if the
file exists before issuing the GetResponse() call , because it throws
WebException. I can of course handle the exception but it's not the best
way
for me to handle the logic of the my program. Is there any other ways to
do
it?

Thanks in advance.
Leon.

[Leon Habinsky]

Nicholas,
Thank you for the prompt response. That is exactly what I've tried doing,
but as soon as I call httpWebResponse = (HttpWebResponse)
httpRequest.GetResponse()
with an invalid URL it throws an exception. Maybe I'm doing something wrong
here?
BTW I'm using #develop for this.

Thanks
Leon.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:%2****************@TK2MSFTNGP12.phx.gbl...

Leon,

You should be able to call GetResponse and get the HttpWebResponse from it without an exception. Once you have it, you should be able to check the StatusCode property to see if the file exists or not (if it doesn't, I
believe you will get a status code in the 400's).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:ut**************@TK2MSFTNGP12.phx.gbl...

Hi guys,

I need to download a file over the Internet and I use the HttpWebRequest
class to accomplish this task. My problem is that, I need to know if the
file exists before issuing the GetResponse() call , because it throws
WebException. I can of course handle the exception but it's not the best
way
for me to handle the logic of the my program. Is there any other ways to
do
it?

Thanks in advance.
Leon.

[Nicholas Paldino [.NET/C# MVP]]

Leon,

Is the URL that you are passing a valid url, or not? If the URL is
invalid, then the exception will be thrown. However, if the URL is a valid
URL, but the resource doesn't exist, then the server should return a status
code.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Nicholas,
Thank you for the prompt response. That is exactly what I've tried doing,
but as soon as I call httpWebResponse = (HttpWebResponse)
httpRequest.GetResponse()
with an invalid URL it throws an exception. Maybe I'm doing something
wrong
here?
BTW I'm using #develop for this.

Thanks
Leon.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote
in
message news:%2****************@TK2MSFTNGP12.phx.gbl...

Leon,

You should be able to call GetResponse and get the HttpWebResponse

from

it without an exception. Once you have it, you should be able to check

the

StatusCode property to see if the file exists or not (if it doesn't, I
believe you will get a status code in the 400's).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:ut**************@TK2MSFTNGP12.phx.gbl...

> Hi guys,
>
> I need to download a file over the Internet and I use the
> HttpWebRequest
> class to accomplish this task. My problem is that, I need to know if
> the
> file exists before issuing the GetResponse() call , because it throws
> WebException. I can of course handle the exception but it's not the
> best
> way
> for me to handle the logic of the my program. Is there any other ways
> to
> do
> it?
>
> Thanks in advance.
> Leon.
>
>

[Leon Habinsky]

Nicholas,

Let say it works for the file "http://localhost/MyStuff/MyFile.exe" which
exists, but throws an exception for the file
"http://localhost/MyStuff/MyFile2.exe" which dosn't exist.

Thanks.
Leon.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:ut**************@TK2MSFTNGP15.phx.gbl...

Leon,

Is the URL that you are passing a valid url, or not? If the URL is
invalid, then the exception will be thrown. However, if the URL is a valid URL, but the resource doesn't exist, then the server should return a status code.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Nicholas,
Thank you for the prompt response. That is exactly what I've tried doing, but as soon as I call httpWebResponse = (HttpWebResponse)
httpRequest.GetResponse()
with an invalid URL it throws an exception. Maybe I'm doing something
wrong
here?
BTW I'm using #develop for this.

Thanks
Leon.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote
in
message news:%2****************@TK2MSFTNGP12.phx.gbl...

Leon,

You should be able to call GetResponse and get the HttpWebResponse

from

it without an exception. Once you have it, you should be able to check

the

StatusCode property to see if the file exists or not (if it doesn't, I
believe you will get a status code in the 400's).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Leon Habinsky" <_n**************@hotmail.com> wrote in message
news:ut**************@TK2MSFTNGP12.phx.gbl...
> Hi guys,
>
> I need to download a file over the Internet and I use the
> HttpWebRequest
> class to accomplish this task. My problem is that, I need to know if
> the
> file exists before issuing the GetResponse() call , because it throws > WebException. I can of course handle the exception but it's not the
> best
> way
> for me to handle the logic of the my program. Is there any other ways
> to
> do
> it?
>
> Thanks in advance.
> Leon.
>
>

[Joerg Jooss]

Leon Habinsky wrote:

Hi guys,

I need to download a file over the Internet and I use the
HttpWebRequest class to accomplish this task. My problem is that, I
need to know if the file exists before issuing the GetResponse()
call , because it throws WebException. I can of course handle the
exception but it's not the best way for me to handle the logic of the
my program. Is there any other ways to do it?

No. Any error level HTTP status code is reported as WebException. Why should
your code have trouble dealing with that?

Cheers,

--
Joerg Jooss
www.joergjooss.de
ne**@joergjooss.de