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)     ); } 

Answer 2

This one's been beat to death but I thought I'd post my own solution which I think is cleaner than many of the other answers.

public static string AbsoluteAction(this UrlHelper url, string actionName, string controllerName, object routeValues) {     return url.Action(actionName, controllerName, routeValues, url.RequestContext.HttpContext.Request.Url.Scheme); }  public static string AbsoluteContent(this UrlHelper url, string path) {     Uri uri = new Uri(path, UriKind.RelativeOrAbsolute);      //If the URI is not already absolute, rebuild it based on the current request.     if (!uri.IsAbsoluteUri)     {         Uri requestUrl = url.RequestContext.HttpContext.Request.Url;         UriBuilder builder = new UriBuilder(requestUrl.Scheme, requestUrl.Host, requestUrl.Port);          builder.Path = VirtualPathUtility.ToAbsolute(path);         uri = builder.Uri;     }      return uri.ToString(); }