windows-phone-7 - HtmlAgilityPack XPath 无效 token

Question

偶尔会看到无效的 token 异常。并非每次都抛出异常，并且 XPath 是静态的。不知道发生了什么。

doc.DocumentNode.SelectSingleNode("//*[contains(@itemprop,'softwareVersion')]");

.

Message:

'//*[contains(@itemprop,'softwareVersion')]' has an invalid token.


StackTrace:

at MS.Internal.Xml.XPath.XPathParser.CheckToken(LexKind t)
at MS.Internal.Xml.XPath.XPathParser.ParsePredicate(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseStep(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseRelativeLocationPath(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseLocationPath(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParsePathExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseUnionExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseUnaryExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseMultiplicativeExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseAdditiveExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseRelationalExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseEqualityExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseAndExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseOrExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseXPathExpresion(String xpathExpresion)
at System.Xml.XPath.XPathExpression.Compile(String xpath, IXmlNamespaceResolver nsResolver)
at System.Xml.XPath.XPathNavigator.Select(String xpath)
at HtmlAgilityPack.HtmlNode.SelectSingleNode(String xpath)

我有时也为此看到它，具有相同的无效 token 异常

doc.DocumentNode.SelectNodes("//*[contains(@class,'item')]");

Answer 1

尝试不带 "*":
doc.DocumentNode.SelectSingleNode("//[contains(@itemprop,'softwareVersion')]");