令人惊讶地，这很难做到。
看一下XPath Recommendation，您将看到它定义了一个字面量为：
Literal ::= '"' [^"]* '"' | "'" [^']* "'"
也就是说，XPath表达式中的字符串文字可以包含撇号或双引号，但不能同时包含两者。
您不能使用转义来解决此问题。像这样的文字：
'Some'Value'
将匹配以下XML文本：
Some'Value
这确实意味着，可能有一部分XML文本无法生成匹配的XPath文字，例如：
<elm att=""&apos"/>
但这并不意味着不可能将文本与XPath匹配，这很棘手。在任何情况下，如果您要匹配的值都包含单引号和双引号，则可以构造一个表达式
concat来生成将要匹配的文本：
elm[@att=concat('"', "'")]因此，这导致了这一点，这比我希望的要复杂得多：
/// <summary>/// Produce an XPath literal equal to the value if possible; if not, produce/// an XPath expression that will match the value./// /// Note that this function will produce very long XPath expressions if a value/// contains a long run of double quotes./// </summary>/// <param name="value">The value to match.</param>/// <returns>If the value contains only single or double quotes, an XPath/// literal equal to the value. If it contains both, an XPath expression,/// using concat(), that evaluates to the value.</returns>static string XPathLiteral(string value){ // if the value contains only single or double quotes, construct // an XPath literal if (!value.Contains(""")) { return """ + value + """; } if (!value.Contains("'")) { return "'" + value + "'"; } // if the value contains both single and double quotes, construct an // expression that concatenates all non-double-quote substrings with // the quotes, e.g.: // // concat("foo", '"', "bar") StringBuilder sb = new StringBuilder(); sb.Append("concat("); string[] substrings = value.Split('"'); for (int i = 0; i < substrings.Length; i++ ) { bool needComma = (i>0); if (substrings[i] != "") { if (i > 0) { sb.Append(", "); } sb.Append("""); sb.Append(substrings[i]); sb.Append("""); needComma = true; } if (i < substrings.Length - 1) { if (needComma) { sb.Append(", "); } sb.Append("'"'"); } } sb.Append(")"); return sb.ToString();}是的，我在所有边缘情况下都进行了测试。这就是逻辑如此愚蠢的原因：
foreach (string s in new[] { "foo", // no quotes ""foo", // double quotes only "'foo", // single quotes only "'foo"bar", // both; double quotes in mid-string "'foo"bar"baz", // multiple double quotes in mid-string "'foo"",// string ends with double quotes "'foo""", // string ends with run of double quotes ""'foo",// string begins with double quotes """'foo", // string begins with run of double quotes "'foo""bar" // run of double quotes in mid-string }) { Console.Write(s); Console.Write(" = "); Console.WriteLine(XPathLiteral(s)); XmlElement elm = d.CreateElement("test"); d.documentElement.AppendChild(elm); elm.SetAttribute("value", s); string xpath = "/root/test[@value = " + XPathLiteral(s) + "]"; if (d.SelectSingleNode(xpath) == elm) { Console.WriteLine("OK"); } else { Console.WriteLine("Should have found a match for {0}, and didn't.", s); } } Console.ReadKey();}
