How can I get the root domain URI in ASP.NET?

问题:

Let's say I'm hosting a website at http://www.foobar.com.

Is there a way I can programmatically ascertain "http://www.foobar.com/" in my code behind (i.e. without having to hardcode it in my web config)?

回答1:

HttpContext.Current.Request.Url can get you all the info on the URL. And can break down the url into its fragments.

回答2:

string baseUrl = Request.Url.GetLeftPart(UriPartial.Authority);

Uri::GetLeftPart Method:

The GetLeftPart method returns a string containing the leftmost portion of the URI string, ending with the portion specified by part.

UriPartial Enumeration:

The scheme and authority segments of the URI.

回答3:

For anyone still wondering, a more complete answer is available at http://devio.wordpress.com/2009/10/19/get-absolut-url-of-asp-net-application/.

public string FullyQualifiedApplicationPath
{
    get
    {
        //Return variable declaration
        var appPath = string.Empty;

        //Getting the current context of HTTP request
        var context = HttpContext.Current;

        //Checking the current context content
        if (context != null)
        {
            //Formatting the fully qualified website url/name
            appPath = string.Format("{0}://{1}{2}{3}",
                                    context.Request.Url.Scheme,
                                    context.Request.Url.Host,
                                    context.Request.Url.Port == 80
                                        ? string.Empty
                                        : ":" + context.Request.Url.Port,
                                    context.Request.ApplicationPath);
        }

        if (!appPath.EndsWith("/"))
            appPath += "/";

        return appPath;
    }
}

回答4:

If example Url is http://www.foobar.com/Page1

HttpContext.Current.Request.Url; //returns "http://www.foobar.com/Page1"


HttpContext.Current.Request.Url.Host; //returns "foobar.com"


HttpContext.Current.Request.Url.Scheme; //returns "http/https"


HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority); //returns "http://www.foobar.com"

回答5:

string hostUrl = Request.Url.Scheme + "://" + Request.Url.Host; //should be "http://hostnamehere.com"

回答6:

To get the entire request URL string:

HttpContext.Current.Request.Url

To get the www.foo.com portion of the request:

HttpContext.Current.Request.Url.Host

Note that you are, to some degree, at the mercy of factors outside your ASP.NET application. If IIS is configured to accept multiple or any host header for your application, then any of those domains which resolved to your application via DNS may show up as the Request Url, depending on which one the user entered.

回答7:

--Adding the port can help when running IIS Express

Request.Url.Scheme + "://" + Request.Url.Host + ":" + Request.Url.Port

回答8:

string domainName = Request.Url.Host

回答9:

I know this is older but the correct way to do this now is

string Domain = HttpContext.Current.Request.Url.Authority

That will get the DNS or ip address with port for a server.

回答10:

Match match = Regex.Match(host, "([^.]+\\.[^.]{1,3}(\\.[^.]{1,3})?)$");
string domain = match.Groups[1].Success ? match.Groups[1].Value : null;

host.com => return host.com
s.host.com => return host.com

host.co.uk => return host.co.uk
www.host.co.uk => return host.co.uk
s1.www.host.co.uk => return host.co.uk

回答11:

This works also:

string url = HttpContext.Request.Url.Authority;

回答12:

C# Example Below:

string scheme = "http://";
string rootUrl = default(string);
if (Request.ServerVariables["HTTPS"].ToString().ToLower() == "on")
{
  scheme = "https://";
}
rootUrl = scheme + Request.ServerVariables["SERVER_NAME"].ToString();

回答13:

string host = Request.Url.Host;
Regex domainReg = new Regex("([^.]+\\.[^.]+)$");
HttpCookie cookie = new HttpCookie(cookieName, "true");
if (domainReg.IsMatch(host))
{
  cookieDomain = domainReg.Match(host).Groups[1].Value;                                
}

回答14:

This will return specifically what you are asking.

Dim mySiteUrl = Request.Url.Host.ToString()

I know this is an older question. But I needed the same simple answer and this returns exactly what is asked (without the http://).