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<p>我需要使用Html Agility Pack從https://coinmarketcap.com/currencies/bitcoin/取得比特幣價格。我正在使用這個例子，它運行良好：</p> <pre class="brush:php;toolbar:false;">var html = @"http://html-agility-pack.net/"; HtmlWeb web = new HtmlWeb(); var htmlDoc = web.Load(html); var node = htmlDoc.DocumentNode.SelectSingleNode("//head/title"); Console.WriteLine("Node Name: " node.Name "\n" node.OuterHtml);</pre> <p>XPath為：<code>//*[@id="__next"]/div/div[1]/div[2]/div/div[1]/div[2]/div/ div[2]/div[1]/div</code></p> <p>HTML代碼：</p> <pre class="brush:php;toolbar:false;"><div class="priceValue "><span>$17,162.42</span></div></pre> <p>我嘗試了下面的程式碼，但它返回"物件引用未設(shè)定為物件的實例"：</p> <pre class="brush:php;toolbar:false;">var html = @"https://coinmarketcap.com/currencies/bitcoin/"; HtmlWeb web = new HtmlWeb(); var htmlDoc = web.Load(html); var node = htmlDoc.DocumentNode.SelectSingleNode("//div[@class='priceValue']/span"); Console.WriteLine("Node Name: " node.Name "\n" node.InnerText);`</pre></p>

const string html = @"https://coinmarketcap.com/currencies/bitcoin/";
        
var web = new HtmlWeb
{
    AutomaticDecompression = DecompressionMethods.GZip
};
HtmlDocument doc = web.Load(html);

HtmlNode node = doc.DocumentNode.SelectSingleNode("http://div[@class='priceValue ']/span");

HtmlNode node = doc.DocumentNode.SelectSingleNode("http://div[contains(@class, 'priceSection')]//div[contains(@class, 'priceValue')]/span");