XpathNavigator引发错误NotSupportedException

Question

我想使用以下代码更新XDocument

private static bool ResetUpdateVersion()
{
    // this indicate either the verwsion is different or not
    // this will either call the update only or writting the defualt
    bool Result = false;
    //// check for version using xpath
    XPathNavigator navigator = document.CreateNavigator();
    //ShortcutList is the main element that contain all the other elements 
    XPathNavigator node = navigator.SelectSingleNode(@"/ShortcutList");
    XmlNamespaceManager ns = new XmlNamespaceManager(navigator.NameTable);
    if (node != null)
    {
        if (node.GetAttribute("Version", ns.DefaultNamespace) != Version)
        {
            node = navigator.SelectSingleNode(@"/ShortcutList/@Version");

            node.SetValue( Version);

            Result = true;
        }
        else
        {
            Result = false;
        }
    }

    return Result;
}

但它在行node.SetValue( Version);上引发NotSupportedException，我不知道为什么，任何解决这个问题的想法

Answer 1

XDocument或XElement上的XPathNavigator是readonly，如果你想操作XDocument或XElement，那么使用System.Xml.Linq中公开的API（例如http://msdn.microsoft.com/en-us/library/system.xml.linq.xelement.setvalue.aspx）。