Determine if Absolute or Relative URL

Question

I have a relative or absolute url in a string. I first need to know whether it is absolute or relative. How do I do this? I then want to determine if the domain of the url is in an allow list.

Here is my allow list, as an example:

string[] Allowed = {    "google.com",    "yahoo.com",    "espn.com" } 

Once I know whether its relative or absolute, its fairly simple I think:

if (Url.IsAbsolute) {     if (!Url.Contains("://"))         Url = "http://" + Url;      return Allowed.Contains(new Uri(Url).Host); } else //Is Relative {     return true; } 

Answer 1

bool IsAbsoluteUrl(string url) {     Uri result;     return Uri.TryCreate(url, UriKind.Absolute, out result); } 

Answer 2

For some reason a couple of good answers were deleted by their owners:

Via @Chamika Sandamal

Uri.IsWellFormedUriString(url, UriKind.Absolute) 

and

Uri.IsWellFormedUriString(url, UriKind.Relative) 

The UriParser and implementations via @Marcelo Cantos