How to delete string from another string position in c#

Question

I have two string:

string url = HttpContext.Current.Request.Url.AbsoluteUri;
//give me :
//url = http://localhost:1302/TESTERS/Default6.aspx?tabindex=2&tabid=15

And:

string path = HttpContext.Current.Request.Url.AbsolutePath;
//give me:
//path = /TESTERS/Default6.aspx

Now I want to get the string:

http://localhost:1302

So what I am thinking of is I will find the position of path in url and remove the sub-string from this position in url. What I tried:

string strApp = url.Remove(url.First(path));

or

string strApp = url.Remove(url.find_first_of(path));

but I can't find the write way to express this idea. How can I archive my goal?

Note that answer that provides correct handling of all sorts of urls is "use UriBuilder", so see if you get one later. — Alexei Levenkov
– Alexei Levenkov, Commented Jun 4, 2014 at 3:50

Pierre-Luc Pineault · Accepted Answer · 2014-06-04 03:46:47Z

3

So basically you want the URL, from the start up to the beginning of your path.

You don't need to "remove" that part, only take characters up to that precise point. First, you can get that location with a simple IndexOf as it returns the position of the first character that matches your string. After this, simply take the part of url that goes from 0 to that index with Substring.

string url = "http://localhost:1302/TESTERS/Default6.aspx?tabindex=2&tabid=15";
string path = "/TESTERS/Default6.aspx";
int indexOfPath = url.IndexOf(path);
string strApp = url.Substring(0, indexOfPath); // gives http://localhost:1302

Which you can shorten to

string strApp = url.Substring(0, url.IndexOf(path));

answered Jun 4, 2014 at 3:46

Pierre-Luc Pineault

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Comments

MustangManiac · Accepted Answer · 2014-06-04 03:57:43Z

0

you can also do something like below code to get the Host of URI

Uri uri =HttpContext.Current.Request.Url.AbsoluteUri ; string host = uri.Authority; // "example.com"

answered Jun 4, 2014 at 3:57

MustangManiac

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Martin Booth · Accepted Answer · 2014-06-04 04:00:27Z

0

Here is another option.. this doesn't require any string manipulation:

new Uri(HttpContext.Current.Request.Url, "/").AbsoluteUri

It generates a new Uri which is the path "/" relative to the original Url

answered Jun 4, 2014 at 4:00

Martin Booth

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Michael Adamission · Accepted Answer · 2014-06-04 04:00:40Z

0

You should just use this instead:

string baseURL = HttpContext.Current.Context.Request.Url.Scheme + "://" +
      HttpContext.Current.Context.Request.Url.Authority;

answered Jun 4, 2014 at 4:00

Michael Adamission

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sisve · Accepted Answer · 2014-06-04 04:00:55Z

0

This should not be solved using string manipulation. HttpContext.Current.Request.Url returns an Uri object which has capabilities to return the information you request.

var requestUrl = HttpContext.Current.Request.Url;
var result = requestUrl.GetComponents(UriComponents.SchemeAndServer,
                                      UriFormat.Unescaped);
// result = "http://localhost:1302"

answered Jun 4, 2014 at 4:00

sisve

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