I need a function which will return correct url from url parts (like in browsers)
string GetUrl(string actual,string path) {
return newurl;
}
For example:
GetUrl('http://example.com/a/b/c/a.php','z/x/c/i.php') -> http://example.com/a/b/c/z/x/c/i.php
GetUrl('http://example.com/开发者_如何转开发a/b/c/a.php','/z/x/c/i.php') -> http://example.com/z/x/c/i.php
GetUrl('http://example.com/a/b/c/a.php','i.php') -> http://example.com/a/b/c/i.php
GetUrl('http://example.com/a/b/c/a.php','/o/d.php?b=1') -> http//example.com/o/d.php?b=1
GetUrl('http://example.com/a/a.php','./o/d.php?b=1') -> http//example.com/a/o/d.php?b=1
Anu suggestions?
What you need is the System.UriBuilder class: http://msdn.microsoft.com/en-us/library/system.uribuilder.aspx
There is also a lightweight solution at CodeProject that doesnt depent on System.Web: http://www.codeproject.com/KB/aspnet/UrlBuilder.aspx
There is also one Query String Builder (but I havent tried it before): http://weblogs.asp.net/bradvincent/archive/2008/10/27/helper-class-querystring-builder-chainable.aspx
public string ConvertLink(string input)
{
//Add http:// to link url
Regex urlRx = new Regex(@"(?<url>(http(s?):[/][/]|www.)([a-z]|[A-Z]|[0-9]|[/.]|[~])*)", RegexOptions.IgnoreCase);
MatchCollection matches = urlRx.Matches(input);
foreach (Match match in matches)
{
string url = match.Groups["url"].Value;
Uri uri = new UriBuilder(url).Uri;
input = input.Replace(url, uri.AbsoluteUri);
}
return input;
}
The code locate every link inside the string with regex, and then use UriBuilder to add protocol to the link if doesn't exist. Since "http://" is default, it will then be added if no protocol exist.
At this link you can take an example of how to take the domain of the URL, with this, you can add the second part to the string of the url
http://www.jonasjohn.de/snippets/csharp/extract-domain-name-from-url.htm
This is the best way to do it, I think.
See you.
What about:
string GetUrl(string actual, string path)
{
return actual.Substring(0, actual.Length - 4).ToString() + "/" + path;
}
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