HtmlAgilityPack文件加載

當我嘗試從文件系統加載文件時，我遇到了問題。問題在於某些HTML控件的值，我在span值內部標記“<”

HtmlDocument doc = new HtmlDocument();
doc.OptionReadEncoding = true;

//StreamReader str = new StreamReader(fileName, Encoding.UTF8);
StreamReader str = new StreamReader(@"E:\HTMLS\OEL\1030,1.html",Encoding.UTF8,true);

doc.Load(str.BaseStream, Encoding.ASCII);
//string streamString = str.ReadToEnd().
str.Close();
//all nodes

doc.DocumentNode.Descendants().Where(x => x.Name == "#text" && (x.InnerText == "\r\n\t" || x.InnerText == "\r\n" || x.InnerText == "\r\n\t\t")).ToList().ForEach(x => x.Remove());
List<HtmlNode> listHtmlNode = doc.DocumentNode.Descendants("table").ToList();