Question

我尝试运行以下代码：

 public void Init(Url rootUrl)
        {
             var web = new HtmlWeb();
            this.doc = web.Load(rootUrl.Value);
        }

使用以下参数：

{<System.Security.Policy.Url version="1">
<Url>http://localhost:85/HCM/HCM.html</Url>
</System.Security.Policy.Url>
}

并获得以下异常： Object reference not set to an instance of an object.

堆栈追踪：

   at HtmlAgilityPack.HtmlDocument.ReadDocumentEncoding(HtmlNode node) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlDocument.cs:line 1916
   at HtmlAgilityPack.HtmlDocument.PushNodeEnd(Int32 index, Boolean close) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlDocument.cs:line 1805
   at HtmlAgilityPack.HtmlDocument.Parse() in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlDocument.cs:line 1492
   at HtmlAgilityPack.HtmlDocument.Load(TextReader reader) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlDocument.cs:line 769
   at HtmlAgilityPack.HtmlDocument.Load(Stream stream, Boolean detectEncodingFromByteOrderMarks) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlDocument.cs:line 597
   at HtmlAgilityPack.HtmlWeb.Get(Uri uri, String method, String path, HtmlDocument doc, IWebProxy proxy, ICredentials creds) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1515
   at HtmlAgilityPack.HtmlWeb.LoadUrl(Uri uri, String method, WebProxy proxy, NetworkCredential creds) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1563
   at HtmlAgilityPack.HtmlWeb.Load(String url, String method) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1152
   at HtmlAgilityPack.HtmlWeb.Load(String url) in C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1107
   at Conduit.CPServices.Logic.HtmlContentMonitor.HtmlAgilityPackHtmlProvider.Init(Url rootUrl) in D:\Conduit\RnD\Server\Services\CP\CPServices\Logic\HtmlContentMonitor\Conduit.CPServices.Logic.HtmlContentMonitor\HtmlAgilityPackHtmlProvider.cs:line 22
   at Conduit.CPServices.Logic.HtmlContentMonitor.HtmlContentManager.FetchRootAndExternlContentAsByteArray(Url rootUrl) in D:\Conduit\RnD\Server\Services\CP\CPServices\Logic\HtmlContentMonitor\Conduit.CPServices.Logic.HtmlContentMonitor\HtmlContentManager.cs:line 112

Answer 1

这是HtmlAgilityPack中的一个错误，可以捕获，例如如果通过<META>标记设置的文档编码无效（例如<META http-equiv="Content-Type" content="text/html; charset=8859-9">）。正如Simon Mourier said，这是1.4.0.0中引入的错误。

查看类似错误的答案：The HAL internals tries to get an appropriate encoding for this string by using something like Encoding.GetEncoding("8859-9") and this throws an error。

为避免这种情况，请手动设置编码，例如：

web.Load(rootUrl.Value, Encoding.GetEncoding("iso-8859-9"));

Answer 2

这可能是HtmlAgilityPack中的一个错误，可能是由于文档中包含HTML。

您可以发布由HtmlAgilityPack解析的HTML吗？

html agility pack无法获取本地托管页面

2 个答案: