URL Validity

[Luke Davis]

Is there an easy method that takes a URL string and checks if it is valid?



Luke

 

[Robbe Morris - [MVP] C#]

What would you consider "invalid"?

 

[Cowboy \(Gregory A. Beamer\)]

You can Regex the string, but something like

http://www.thisisafakesite.com/default.aspx

would be seen as valid, as it is correctly formed. You would have to
actually issue a request to the server and check the return code to
determine if it was a real site.

 

[Luke Davis]

Invalid as in a 404 error or if it's an image it will come back with a red
"x". There be nothing at the domain. So if I passed http://google.com/
it would come back true, but if I passed http://asfsaf3985r2934.com it will
come back false.

What would you consider "invalid"?

--
Robbe Morris [Microsoft MVP - Visual C#]
.NET PropertyGrid Control - ListBox, ComboBox, and Custom Classes
http://www.eggheadcafe.com/tutorial...af-5cd3abe27a75/net-propertygrid-control.aspx

Is there an easy method that takes a URL string and checks if it is
valid?



Luke

 

[Robbe Morris - [MVP] C#]

HttpWebRequest and HttpWebResponse

There are tons of samples for these two classes.

--
Robbe Morris [Microsoft MVP - Visual C#]
..NET PropertyGrid Control - ListBox, ComboBox, and Custom Classes
http://www.eggheadcafe.com/tutorial...af-5cd3abe27a75/net-propertygrid-control.aspx

Invalid as in a 404 error or if it's an image it will come back with a red
"x". There be nothing at the domain. So if I passed
http://google.com/ it would come back true, but if I passed
http://asfsaf3985r2934.com it will come back false.

What would you consider "invalid"?

--
Robbe Morris [Microsoft MVP - Visual C#]
.NET PropertyGrid Control - ListBox, ComboBox, and Custom Classes
http://www.eggheadcafe.com/tutorial...af-5cd3abe27a75/net-propertygrid-control.aspx

Is there an easy method that takes a URL string and checks if it is
valid?



Luke

 

[Donn Felker]

I have a post on how to work with HttpWebRequest here:
http://blog.donnfelker.com/2007/09/13/AutomatedFormPostingWithNETASPNETsCURL.aspx

 

[Jesse Houwing]

Hello Cowboy (Gregory A. Beamer),

You can Regex the string, but something like

http://www.thisisafakesite.com/default.aspx

would be seen as valid, as it is correctly formed. You would have to
actually issue a request to the server and check the return code to
determine if it was a real site.

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You could always pass it to the URI class and see what happens. My guess
is that it will choke on incorrectly formatted URI's.