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我已经使用这个代码几个月了，它对我来说一直很好，但现在我收到了这个错误：Object reference not set to an instance of an object.在这行代码：

Dim Page_Most_Recent_Quarter As Date = document.DocumentNode.SelectSingleNode("//*[@id='financials-iframe-wrap']/div/table//tr[2]/th[3]").InnerText

这是完整的代码：

Dim wreq As HttpWebRequest = WebRequest.Create("http://www.nasdaq.com/symbol/GOOG/financials?query=income-statement&data=quarterly")
    wreq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5"
    wreq.Method = "get"
    Dim prox As IWebProxy = wreq.Proxy
    prox.Credentials = CredentialCache.DefaultCredentials
    Dim document As New HtmlAgilityPack.HtmlDocument
    Dim web As New HtmlAgilityPack.HtmlWeb
    web.UseCookies = True
    web.PreRequest = New HtmlAgilityPack.HtmlWeb.PreRequestHandler(AddressOf onPreReq)
    wreq.CookieContainer = cookies
    Dim res As HttpWebResponse = wreq.GetResponse()
    document.Load(res.GetResponseStream, True)
    Dim Page_Most_Recent_Quarter As Date = document.DocumentNode.SelectSingleNode("//*[@id='financials-iframe-wrap']/div/table//tr[2]/th[3]").InnerText

我认为没有任何会影响此代码的更改。我无法弄清楚出了什么问题。

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1 回答 1

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我猜该节点不存在或已被重命名。这是一个公共网站，会随时更改他们的内容。因为它没有找到它，所以它是一个 NOTHING，你不能.InnerText对一个 nothing 执行 a。

尝试放入document.DocumentNode.SelectSingleNode("//*[@id='financials-iframe-wrap']/div/table//tr[2]/th[3]")另一个变量并在调试时检查它。

于 2013-10-24T16:58:11.813 回答