如何从<select> <option>获取值

Question

我试图从＆lt; select＆gt;中获取一些元素和＆lt;选项＆gt;元件。 这是我的代码： for（int td = 1; td＆lt; = 1; td ++） {     使用（WebClient wc = new WebClient（））     {         string pagina = wc.DownloadString（＆＃34; http：//www.serebii.net/attackdex-xy/"）;         HtmlDocument doc = new HtmlDocument（）;         doc.LoadHtml（pagina）;         串烟;         // var prova = doc.DocumentNode.SelectSingleNode（＆＃34; / html / body / table [2] / tr [2] / td [2] / div [2] / table / tr / td [1] / form /选择/选项＆＃34）;         foreach（doc.DocumentNode.SelectNodes中的HtmlNode节点（String.Format（＆＃34; / html / body / table [2] / tr [2] / td [2] / font / div [2] / table / tr / td [{0}] / select / option＆＃34;，td）））         {             attacco = node.NextSibling.InnerText;             if（attacco！=＆＃34; AttackDex：A - G \ n＆＃34;＆amp;＆amp; attacco！=＆＃34; AttackDex：H - R \ n＆＃34;＆amp;＆amp; attacco！=＆＃34 ; AttackDex：S - Z \ n＆＃34;）             {                 var url = string.Format（＆＃34; http：//www.serebii.net/attackdex-xy/ {0} .shtml＆＃34;，attacco.ToLower（）。替换（＆＃34;＆＃34; ，＆＃34;＆＃34;））;                 string attackPage = wc.DownloadString（url）;                 HtmlDocument doc2 = new HtmlDocument（）;                 doc2.LoadHtml（attackPage）;                 var category = doc.DocumentNode.SelectSingleNode（＆＃34; / html / body / table [2] / tr [2] / td [2]＆＃34;）;             }         }     } } 这是html页面的代码： ＆lt; select name =＆＃34; SelectURL＆＃34;平变化=＆＃34; document.location.href = document.nav.SelectURL.options [document.nav.SelectURL.selectedIndex]。价值＆＃34;风格=＆＃34;颜色：＃383838; font-size：8pt;背景：＃CEBC77＆＃34;大小=＆＃34; 1＆＃34;＆GT;  ＆lt; option＆gt; AttackDex：A - G. ＆lt; / option＆gt;＆lt; option value =＆＃34; /attackdex-xy/absorb.shtml"＆gt; Absorb＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/acid.shtml"＆gt; Acid＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/acidarmor.shtml"＆gt; Acid Armor＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/acidspray.shtml"＆gt; Acid Spray＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/acrobatics.shtml"＆gt; Acrobatics＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/acupressure.shtml"＆gt; Acupressure＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/aerialace.shtml"＆gt; Aerial Ace＆lt; / option＆gt; ＆lt; option value =＆＃34; /attackdex-xy/aeroblast.shtml"＆gt; Aeroblast＆lt; / option＆gt; [...] 当我运行程序时，node（在foreach块中）的值为NULL。

Answer 1

我通过选择文档中的所有选项，然后过滤到具有名为“SelectURL”的祖先选择标记的选项来实现它。

doc.DocumentNode.SelectNodes("//option[ancestor::select[@name='SelectURL']]")