我需要使用Html Agility Pack从https://coinmarketcap.com/currencies/bitcoin/获取比特币价格。我正在使用这个例子，它运行良好：
1
1155var 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);
XPath为：//*[@id="__next"]/div/div[1]/div[2]/div/div[1]/div[2]/div/div[2]/div[1]/div
HTML代码：
<div class="priceValue "><span>$17,162.42</span></div>
我尝试了下面的代码，但它返回"对象引用未设置为对象的实例"：
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);` 
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