C#学习教程：使用单引号和双引号编码XPath表达式分享

这就是我想出来的

 public static string EncaseXpathString(string input) { // If we don't have any " then encase string in " if (!input.Contains(""")) return String.Format(""{0}"", input); // If we have some " but no ' then encase in ' if (!input.Contains("'")) return String.Format("'{0}'", input); // If we get here we have both " and ' in the string so must use Concat StringBuilder sb = new StringBuilder("concat("); // Going to look for " as they are LESS likely than ' in our data so will minimise // number of arguments to concat. int lastPos = 0; int nextPos = input.IndexOf("""); while (nextPos != -1) { // If this is not the first time through the loop then seperate arguments with , if (lastPos != 0) sb.Append(","); sb.AppendFormat(""{0}",'"'", input.Substring(lastPos, nextPos - lastPos)); lastPos = ++nextPos; // Find next occurance nextPos = input.IndexOf(""", lastPos); } sb.Append(")"); return sb.ToString(); } 

叫做类似的东西

 XmlNode node = doc.SelectSingleNode("//review[@name=" + EncaseXpathString("Fred's "Fancy Pizza"" + "]") 

所以我们得到以下结果

 EncaseXpathString("Pizza Shed") == "'Pizza Shed'"; EncaseXpathString("Bob's pizza") == ""Bob's Pizza""; EncaseXpathString(""Pizza" Pam" == "'"Pizza" Pam'"; EncaseXpathString("Fred's "Fancy Pizza"") == "concat("Fred's ",'"',"Fancy Pizza",'"')"; 

所以它只在必要时才使用concat（字符串中的“和”）

最后的结果显示concat操作并不尽可能短（请参阅问题），但它足够接近并且任何更优化都会非常复杂，因为您必须寻找匹配的“或”对。

到目前为止，我遇到了所有解决方案的问题。 一个有额外的文本部分（例如&＃8217;“&＃8217;或”&＃8217;），它打破了你正在寻找的东西。一个删除了最后一个引用/ dblquote之后的所有文本，它也会中断。

这是一个愚蠢的vb开发人员的愚蠢而快速的解决方案：

 Function ParseXpathString(ByVal input As String) As String input = Replace(input, "'", Chr(1)) input = Replace(input, """", Chr(2)) input = Replace(input, Chr(1), "',""'"",'") input = Replace(input, Chr(2), "','""','") input = "concat('','" + input + "')" Return input End Function 

用法（与前面的例子相同）：

 x.SelectNodes("/path[@attr=" & ParseXpathString(attrvalue) & "]") 

我需要在XSLT本身中执行此操作，因此基于此页面上的答案提出以下内容：

    " '  '' ""  concat(     , "'",      )    

另一种变化&＃8230;&＃8230;我的concat（）部分有点懒，但至少它使用了整个值。

  /// 
 /// Returns an XPath string literal to use for searching attribute values (wraped in apostrophes, quotes, or as a concat function). /// 
 /// Attribute value to encode and wrap. public static string CreateXpathLiteral(string attributeValue) { if (!attributeValue.Contains(""")) { // if we don't have any quotes, then wrap string in quotes... return string.Format(""{0}"", attributeValue); } else if (!attributeValue.Contains("'")) { // if we have some quotes, but no apostrophes, then wrap in apostrophes... return string.Format("'{0}'", attributeValue); } else { // must use concat so the literal in the XPath will find a match... return string.Format("concat("{0}")", attributeValue.Replace(""", "",'"',"")); } } 

加入这个有趣的事物

 public string XPathLiteral(string text) { const string APOS = "'"; const string QUOTE = @""""; int pos = 0; int posApos; int posQuote; posQuote = text.IndexOf(QUOTE, pos); if (posQuote <0) { return QUOTE + text + QUOTE; }//if posApos = text.IndexOf(APOS, pos); if (posApos <0) { return APOS + text + APOS; }//if bool cOntainsApos= posApos