String escape/unescape into XML

Is there any C# function which could be used to escape and un-escape a string, which could be used to fill in the content of an XML element?

And how to unescape?

 

【解决方案】

public static string XmlEscape(string unescaped) { XmlDocument doc = new XmlDocument(); XmlNode node = doc.CreateElement("root"); node.InnerText = unescaped; return node.InnerXml; }   public static string XmlUnescape(string escaped) { XmlDocument doc = new XmlDocument(); XmlNode node = doc.CreateElement("root"); node.InnerXml = escaped; return node.InnerText; }