asp.net - How do I turn a relative URL into a full URL?

Question

This is probably explained more easily with an example. I'm trying to find a way of turning a relative URL, e.g. "/Foo.aspx" or "~/Foo.aspx" into a full URL, e.g. http://localhost/Foo.aspx. That way when I deploy to test or stage, where the domain under which the site runs is different, I will get http://test/Foo.aspx and http://stage/Foo.aspx.

Any ideas?

Answer 1

Have a play with this (modified from here)

public string ConvertRelativeUrlToAbsoluteUrl(string relativeUrl) {
    return string.Format("http{0}://{1}{2}",
        (Request.IsSecureConnection) ? "s" : "", 
        Request.Url.Host,
        Page.ResolveUrl(relativeUrl)
    );
}