的Html敏捷包，的SelectSingleNode

此代碼的工作的Html敏捷包，的SelectSingleNode

 WebClient client = new WebClient(); 
     client.Encoding = Encoding.UTF8; 
     html = client.DownloadString("http://www.imdb.com/chart/moviemeter?ref_=nv_mv_mpm_8"); 
     HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument(); 
     doc.LoadHtml(html); 
     MessageBox.Show(doc.DocumentNode.SelectSingleNode("//*[@id='main']/div/span/div/div/div[3]/table/tbody/tr[1]/td[2]/a").InnerText);

的Html代碼在這裏：

<a href="/title/tt4972582/?pf_rd_m=A2FGELUUNOQJNL&amp;pf_rd_p=2240084082&amp;pf_rd_r=1QW31NGD6JSE46F79CKQ&amp;pf_rd_s=center-1&amp;pf_rd_t=15506&amp;pf_rd_i=moviemeter&amp;ref_=chtmvm_tt_1" title="M. Night Shyamalan (dir.), James McAvoy, Anya Taylor-Joy">Split</a>

MessageBox中顯示，這是「拆分」的文字。但是看看這個HTML代碼：

<div class="summary_text" itemprop="description"> 
       Three girls are kidnapped by a man with a diagnosed 23 distinct personalities, and must try and escape before the apparent emergence of a frightful new 24th. 
     </div>

我想MessageBox中顯示哪些開頭的文字「三個女孩是kidn ......」所以我寫了這個代碼：

 WebClient client2 = new WebClient(); 
     client2.Encoding = Encoding.UTF8; 
     HtmlAgilityPack.HtmlDocument doc2 = new HtmlAgilityPack.HtmlDocument(); 
     doc2.LoadHtml(client2.DownloadString("http://www.imdb.com/title/tt4972582/?pf_rd_m=A2FGELUUNOQJNL&pf_rd_p=2240084082&pf_rd_r=1QW31NGD6JSE46F79CKQ&pf_rd_s=center-1&pf_rd_t=15506&pf_rd_i=moviemeter&ref_=chtmvm_tt_1")); 
     MessageBox.Show(doc2.DocumentNode.SelectSingleNode("//*[@id='title - overview - widget']/div[3]/div[1]/div[1]").InnerText);

當我開始這個代碼，發生類型爲「System.NullReferenceException」的未處理的異常

Xpaths是真的，我已經檢查了一百次，所以我該怎麼辦？

來源

2017-02-03 Onur

爲什麼你不使用特定的xpath而不是通過另一個？由於該xpath至少在此刻與您想要的元素不匹配。說明不在該div內。 –

我怎樣才能達到這個描述？你可以幫我嗎？ – Onur

你可以試試嗎？

 HtmlWeb web = new HtmlWeb(); 
     HtmlDocument doc = web.Load("http://www.imdb.com/title/tt4972582/?pf_rd_m=A2FGELUUNOQJNL&pf_rd_p=2240084082&pf_rd_r=1QW31NGD6JSE46F79CKQ&pf_rd_s=center-1&pf_rd_t=15506&pf_rd_i=moviemeter&ref_=chtmvm_tt_1"); 
     var desNodeText = doc.DocumentNode.Descendants("div").FirstOrDefault(o => o.GetAttributeValue("class", "") == "summary_text").InnerText;

來源

2017-02-03 18:23:19

或xpath：'// div [@ class ='summary_text']' –

Works非常感謝.. – Onur

的Html敏捷包，的SelectSingleNode

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