Determine site's absolute, fully-qualified url in asp.net

Question

How can I consistently get the absolute, fully-qualified root or base url of the site regardless of whether the site is in a virtual directory and regardless of where my code is in the directory structure? I've tried every variable and function I can think of and haven't found a good way.

I want to be able to get the url of the current site, i.e. http://www.example.com or if it's a virtual directory, http://www.example.com/DNN/

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Here's some of the things I've tried and the result. The only one that includes the whole piece that I want (http://localhost:4471/DNN441) is Request.URI.AbsoluteURI:

• Request.PhysicalPath: C:\WebSites\DNN441\Default.aspx
• Request.ApplicationPath: /DNN441
• Request.PhysicalApplicationPath: C:\WebSites\DNN441\
• MapPath: C:\WebSites\DNN441\DesktopModules\Articles\Templates\Default.aspx
• RawURL: /DNN441/ModuleTesting/Articles/tabid/56/ctl/Details/mid/374/ItemID/1/Default.aspx
• Request.Url.AbsoluteUri: http://localhost:4471/DNN441/Default.aspx
• Request.Url.AbsolutePath: /DNN441/Default.aspx
• Request.Url.LocalPath: /DNN441/Default.aspx Request.Url.Host: localhost
• Request.Url.PathAndQuery: /DNN441/Default.aspx?TabId=56&ctl=Details&mid=374&ItemID=1

Answer 1

In reading through the answer provided in Rick Strahl's Blog I found what I really needed was quite simple. First you need to determine the relative path (which for me was the easy part), and pass that into the function defined below:

VB.NET

Public Shared Function GetFullyQualifiedURL(ByVal s as string) As String
   Dim Result as URI = New URI(HttpContext.Current.Request.Url, s)
   Return Result.ToString
End Function

C#

public static string GetFullyQualifiedURL(string s) {
    Uri Result = new Uri(HttpContext.Current.Request.Url, s);
    return Result.ToString();
}

Answer 2

The accepted answer assumes that the current request is already at the server/virtual root. Try this:

Request.Url.GetLeftPart(UriPartial.Authority) + Request.ApplicationPath