C# 根据链接获取一级域名和当前域名
<div class="cnblogs_code"><pre><span style="color: rgba(0, 0, 255, 1)">using</span><span style="color: rgba(0, 0, 0, 1)"> System;
</span><span style="color: rgba(0, 0, 255, 1)">using</span><span style="color: rgba(0, 0, 0, 1)"> System.Collections.Generic;
</span><span style="color: rgba(0, 0, 255, 1)">using</span><span style="color: rgba(0, 0, 0, 1)"> System.Linq;
</span><span style="color: rgba(0, 0, 255, 1)">using</span><span style="color: rgba(0, 0, 0, 1)"> System.Text;
</span><span style="color: rgba(0, 0, 255, 1)">using</span><span style="color: rgba(0, 0, 0, 1)"> System.Threading.Tasks;
</span><span style="color: rgba(0, 0, 255, 1)">namespace</span><span style="color: rgba(0, 0, 0, 1)"> CSharpStudy
{
</span><span style="color: rgba(0, 0, 255, 1)">class</span><span style="color: rgba(0, 0, 0, 1)"> Program
{
</span><span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span> Main(<span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)">[] args)
{
</span><span style="color: rgba(0, 0, 255, 1)">string</span> url = <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">http://www.xinhuanet.com/2018-08/02/c_1123215278.htm</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">string url = "</span><span style="color: rgba(0, 128, 0, 1); text-decoration: underline">http://news.ifeng.com/a/20180803/59600750_0.shtml</span><span style="color: rgba(0, 128, 0, 1)">";</span>
<span style="color: rgba(0, 0, 0, 1)">
Uri uri </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> Uri(url);
</span><span style="color: rgba(0, 0, 255, 1)">string</span> topDomain =<span style="color: rgba(0, 0, 0, 1)"> GetBaseDomain(uri.Host);
Console.WriteLine(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">当前域名：</span><span style="color: rgba(128, 0, 0, 1)">"</span> +<span style="color: rgba(0, 0, 0, 1)"> uri.Host);
Console.WriteLine(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">一级域名：</span><span style="color: rgba(128, 0, 0, 1)">"</span> +<span style="color: rgba(0, 0, 0, 1)"> topDomain);
Console.ReadKey();
}
</span><span style="color: rgba(0, 0, 255, 1)">private</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">string</span> GetBaseDomain(<span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)"> host)
{
HashSet</span><<span style="color: rgba(0, 0, 255, 1)">string</span>> HashSet = <span style="color: rgba(0, 0, 255, 1)">new</span> HashSet<<span style="color: rgba(0, 0, 255, 1)">string</span>>(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">.com|.co|.info|.net|.org|.me|.mobi|.us|.biz|.xxx|.ca|.co.jp|.com.cn|.net.cn|.org.cn|.mx|.tv|.ws|.ag|.com.ag|.net.ag|.org.ag|.am|.asia|.at|.be|.com.br|.net.br|.bz|.com.bz|.net.bz|.cc|.com.co|.net.co|.nom.co|.de|.es|.com.es|.nom.es|.org.es|.eu|.fm|.fr|.gs|.in|.co.in|.firm.in|.gen.in|.ind.in|.net.in|.org.in|.it|.jobs|.jp|.ms|.com.mx|.nl|.nu|.co.nz|.net.nz|.org.nz|.se|.tc|.tk|.tw|.com.tw|.idv.tw|.org.tw|.hk|.co.uk|.me.uk|.org.uk|.vg</span><span style="color: rgba(128, 0, 0, 1)">"</span>.Split(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">|</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">));
</span><span style="color: rgba(0, 0, 255, 1)">string</span>[] hs = host.Split(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
</span><span style="color: rgba(0, 0, 255, 1)">if</span> (hs.Length > <span style="color: rgba(128, 0, 128, 1)">2</span><span style="color: rgba(0, 0, 0, 1)">)
{
</span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">传入的host地址至少有三段</span>
<span style="color: rgba(0, 0, 255, 1)">int</span> p2 = host.LastIndexOf(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span>); <span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">最后一次“.”出现的位置</span>
<span style="color: rgba(0, 0, 255, 1)">int</span> p1 = host.Substring(<span style="color: rgba(128, 0, 128, 1)">0</span>, p2).LastIndexOf(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span>);<span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">倒数第二个“.”出现的位置</span>
<span style="color: rgba(0, 0, 255, 1)">string</span> s1 =<span style="color: rgba(0, 0, 0, 1)"> host.Substring(p1);
</span><span style="color: rgba(0, 0, 255, 1)">if</span> (!<span style="color: rgba(0, 0, 0, 1)">HashSet.Contains(s1))
</span><span style="color: rgba(0, 0, 255, 1)">return</span> s1.TrimStart(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">);
</span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">域名后缀为两段（有用“.”分隔）</span>
<span style="color: rgba(0, 0, 255, 1)">if</span> (hs.Length > <span style="color: rgba(128, 0, 128, 1)">3</span><span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">return</span> host.Substring(host.Substring(<span style="color: rgba(128, 0, 128, 1)">0</span>, p1).LastIndexOf(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">));
</span><span style="color: rgba(0, 0, 255, 1)">else</span>
<span style="color: rgba(0, 0, 255, 1)">return</span> host.TrimStart(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">);
}
</span><span style="color: rgba(0, 0, 255, 1)">else</span> <span style="color: rgba(0, 0, 255, 1)">if</span> (hs.Length == <span style="color: rgba(128, 0, 128, 1)">2</span><span style="color: rgba(0, 0, 0, 1)">)
{
</span><span style="color: rgba(0, 0, 255, 1)">return</span> host.TrimStart(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">.</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">);
}
</span><span style="color: rgba(0, 0, 255, 1)">else</span><span style="color: rgba(0, 0, 0, 1)">
{
</span><span style="color: rgba(0, 0, 255, 1)">return</span> <span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)">.Empty;
}
}
}
}</span></pre>
</div>
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来源：https://www.cnblogs.com/duhaoran/p/14272666.html
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