blocks|key|404156|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|404157|Console.WriteLine(GetDomain.GetDomainFromUrl("http://support.domain.com/default.aspx?id=12345"));|code-block|syntax|javascript|404158|它将输出support.domain.com|404159|或者尝试|404160|Uri.GetLeftPart(+UriPartial.Authority+)|404161|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Try this

<pre><code>Console.WriteLine(GetDomain.GetDomainFromUrl("http://support.domain.com/default.aspx?id=12345"));
</code></pre>

It will output support.domain.com

Or try 

<pre><code>Uri.GetLeftPart( UriPartial.Authority )
</code></pre>

blocks|key|404198|text|使用Uri类和Host属性|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|404199|Uri+url+=+new+Uri(@"http://support.domain.com/default.aspx?id=12345");
Console.WriteLine(url.Host);|code-block|syntax|javascript|404200|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.uri.aspx|1|http://msdn.microsoft.com/en-us/library/system.uri.host.aspx^0|2|3|0|7|4|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

Use <a href="http://msdn.microsoft.com/en-us/library/system.uri.aspx" rel="noreferrer">Uri</a> class and use <a href="http://msdn.microsoft.com/en-us/library/system.uri.host.aspx" rel="noreferrer">Host</a> property

<pre><code>Uri url = new Uri(@"http://support.domain.com/default.aspx?id=12345");
Console.WriteLine(url.Host);
</code></pre>

blocks|key|404235|text|您应该将字符串构造为URI对象，并且Authority属性将返回所需的内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|404236|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/txt7706a.aspx|1|http://msdn.microsoft.com/en-us/library/system.uri.authority.aspx^0|A|3|0|I|9|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

You should construct your string as <a href="http://msdn.microsoft.com/en-us/library/txt7706a.aspx" rel="nofollow">URI</a> object and <a href="http://msdn.microsoft.com/en-us/library/system.uri.authority.aspx" rel="nofollow">Authority</a> property returns what you need.

blocks|key|404261|text|尝试下面的语句|type|unstyled|depth|inlineStyleRanges|entityRanges|data|404262|+Uri+myuri+=+new+Uri(System.Web.HttpContext.Current.Request.Url.AbsoluteUri);
+string+pathQuery+=+myuri.PathAndQuery;
+string+hostName+=+myuri.ToString().Replace(pathQuery+,+"");|code-block|syntax|javascript|404263|Example1|404264|+Input+:+http://localhost:4366/Default.aspx?id=notlogin
+Ouput+:+http://localhost:4366|404265|Example2|404266|+Input+:+http://support.domain.com/default.aspx?id=12345
+Output:+support.domain.com|404267|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

try following statement

<pre><code> Uri myuri = new Uri(System.Web.HttpContext.Current.Request.Url.AbsoluteUri);
 string pathQuery = myuri.PathAndQuery;
 string hostName = myuri.ToString().Replace(pathQuery , "");
</code></pre>

Example1

<pre><code> Input : http://localhost:4366/Default.aspx?id=notlogin
 Ouput : http://localhost:4366
</code></pre>

Example2

<pre><code> Input : http://support.domain.com/default.aspx?id=12345
 Output: support.domain.com
</code></pre>

blocks|key|186146|text|WWW是一个别名，所以如果你想要一个域，你不需要它。下面是我的小函数，用于从字符串中获取真正的域|type|unstyled|depth|inlineStyleRanges|entityRanges|data|186147|private+string+GetDomain(string+url)
++++{
++++++++string[]+split+=+url.Split('.');
++++++++if+(split.Length+>+2)
++++++++++++return+split[split.Length+-+2]+%2B+"."+%2B+split[split.Length+-+1];
++++++++else
++++++++++++return+url;

++++}|code-block|syntax|javascript|186148|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

WWW is an alias, so you don't need it if you want a domain.
Here is my litllte function to get the real domain from a string

<pre><code>private string GetDomain(string url)
 {
 string[] split = url.Split('.');
 if (split.Length &gt; 2)
 return split[split.Length - 2] + "." + split[split.Length - 1];
 else
 return url;

 }
</code></pre>

blocks|key|186185|text|最好的方法，也是正确的方法是使用Uri.Authority字段|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|186186|像这样加载和使用Uri：|186187|Uri+NewUri;

if+(Uri.TryCreate([string+with+your+Url],+UriKind.Absolute,+out+NewUri))
{
+++++Console.Writeline(NewUri.Authority);
}

Input+:+http://support.domain.com/default.aspx?id=12345
Output+:+support.domain.com

Input+:+http://www.domain.com/default.aspx?id=12345
output+:+www.domain.com

Input+:+http://localhost/default.aspx?id=12345
Output+:+localhost|code-block|syntax|javascript|186188|如果你想操纵Url，使用Uri对象是一个很好的方法。https://msdn.microsoft.com/en-us/library/system.uri(v=vs.110).aspx|186189|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/system.uri(v=vs.110).aspx^0|G|D|0|0|0|Q|1U|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

The best way, and the right way to do it is using <code>Uri.Authority</code> field

Load and use Uri like so : 

<pre><code>Uri NewUri;

if (Uri.TryCreate([string with your Url], UriKind.Absolute, out NewUri))
{
 Console.Writeline(NewUri.Authority);
}

Input : http://support.domain.com/default.aspx?id=12345
Output : support.domain.com

Input : http://www.domain.com/default.aspx?id=12345
output : www.domain.com

Input : http://localhost/default.aspx?id=12345
Output : localhost
</code></pre>

If you want to manipulate Url, using Uri object is the good way to do it. 
<a href="https://msdn.microsoft.com/en-us/library/system.uri(v=vs.110).aspx" rel="noreferrer">https://msdn.microsoft.com/en-us/library/system.uri(v=vs.110).aspx</a>

blocks|key|186259|text|+var+url+=+Regex.Match(url,+@"(http:%7Chttps:)\/\/(.*?)\/");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|186260|INPUT+=+"https://stackoverflow.com/questions/"；|unstyled|offset|length|186261|输出=+"https://stackoverflow.com/"；|186262|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/|1|https://stackoverflow.com/^0|0|9|11|0|0|5|R|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@$G|W|H|X|1|Y]]|A|$]]|$1|I|3|J|5|F|7|Z|8|@]|9|@$G|10|H|11|1|12]]|A|$]]|$1|K|3|-4|5|F|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

<pre><code> var url = Regex.Match(url, @&quot;(http:|https:)\/\/(.*?)\/&quot;);
</code></pre>
INPUT = &quot;https://stackoverflow.com/questions/&quot;;
OUTPUT = &quot;https://stackoverflow.com/&quot;;

blocks|key|404483|text|++++public+static+string+DownloadImage(string+URL,+string+MetaIcon,string+folder,string+name)
++++{
++++++++try
++++++++{
++++++++++++WebClient+oClient+=+new+WebClient();

++++++++++++string+LocalState+=+Windows.Storage.ApplicationData.Current.LocalFolder.Path;

++++++++++++string+storesIcons+=+Directory.CreateDirectory(LocalState+%2B+folder).ToString();

++++++++++++string+path+=+Path.Combine(storesIcons,+name+%2B+".png");

++++++++++++
++++++++++++//si+la+imagen+no+es+valida+ej+"/icon.png"
++++++++++++if+(!TextBoxEvent.IsValidURL(MetaIcon))
++++++++++++{
++++++++++++++++Uri+uri+=+new+Uri(URL);
++++++++++++++++string+DownloadImage+=+"https://"+%2B+uri.Host+%2B+MetaIcon;

++++++++++++++++oClient.DownloadFile(new+Uri(DownloadImage),+path);
++++++++++++}
++++++++++++//si+la+imagen+tiene+todo+ej+https://www.mercadolibre.com/icon.png
++++++++++++else
++++++++++++{
++++++++++++++++oClient.DownloadFile(new+Uri(MetaIcon),+path);
++++++++++++}

++++++++++++return+path;
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++return+ex.ToString();
++++++++}
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|404484|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> public static string DownloadImage(string URL, string MetaIcon,string folder,string name)
 {
 try
 {
 WebClient oClient = new WebClient();

 string LocalState = Windows.Storage.ApplicationData.Current.LocalFolder.Path;

 string storesIcons = Directory.CreateDirectory(LocalState + folder).ToString();

 string path = Path.Combine(storesIcons, name + &quot;.png&quot;);

 
 //si la imagen no es valida ej &quot;/icon.png&quot;
 if (!TextBoxEvent.IsValidURL(MetaIcon))
 {
 Uri uri = new Uri(URL);
 string DownloadImage = &quot;https://&quot; + uri.Host + MetaIcon;

 oClient.DownloadFile(new Uri(DownloadImage), path);
 }
 //si la imagen tiene todo ej https://www.mercadolibre.com/icon.png
 else
 {
 oClient.DownloadFile(new Uri(MetaIcon), path);
 }

 return path;
 }
 catch (Exception ex)
 {
 return ex.ToString();
 }
 }
</code></pre>

how to get host domain from a string URL?

GetDomain has 1 input "URL", 1 Output "Domain"

Example1

<pre><code>INPUT: http://support.domain.com/default.aspx?id=12345
OUTPUT: support.domain.com
</code></pre>

Example2

<pre><code>INPUT: http://www.domain.com/default.aspx?id=12345
OUTPUT: www.domain.com
</code></pre>

Example3

<pre><code>INPUT: http://localhost/default.aspx?id=12345
OUTPUT: localhost
</code></pre>

Get host domain from URL?

Windows

如何从字符串URL中获取主机域？GetDomain有1个输入"URL"，1个输出“域”Example1INPUT: http://support.domain.com/default.aspx?id=12345OUTPUT: support.domain.comExample2INPUT: http://www.dom...

问是否从URL获取主机域？
EN

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问是否从URL获取主机域？
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