URL validation no working

Question

Hi,

Why below validation return valid for invalid URLs?

if (!Uri.IsWellFormedUriString("microsoft", UriKind.RelativeOrAbsolute))
{
    Console.WriteLine("Invalid URL");
}
else
{
    Console.WriteLine("Valid URL");
}

I want only the following to be valid:

• microsoft.com
• www.microsoft.com
• https://www.microsoft.com

• http://www.microsoft.com

Thanks,
Jassim

Answer 1

Check the URI kind to be Absolute only then.

The method is treating the path you passed as relative path, that's why it can be validated without problem.

Answer 2

This is a valid relative path, in fact, even if you just enter a few letters randomly, it will return the same result.

In html, we might use code like this:

<a href="microsoft"">link text</a>  

When you click it, it will open the file named "microsoft" in the same folder. It is no problem to name the file "microsoft".

This should be stipulated by a certain specification of the Web, and c# is following these specifications.

Uri.IsWellFormedUriString(String, UriKind) Method

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