How can I get all namespaces in scope for a specific XmlElement?

Question

Hi all;

I am editing an XmlDocument and at a given XmlElement, I need to know all prefixes/URIs that are in scope for the element as namespaces? Is there a way to do this? (There's lot's of examples to get all namespaces in the entire document, but I can't find any that limit it to what's in scope.)

This is some existing code and changing to XDocument or LINQ is a no-go.

thanks - dave

Answer 1

Please try if this code meets your requirements.

        static void Main(string[] args)  
        {  
            XmlDocument doc = new XmlDocument();  
            doc.Load(@"d:\test\xml\test.xml");  
            XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);  
            nsmgr.AddNamespace("z", "uriZ");  
            XmlNode nodemsg = doc.SelectSingleNode("//z:person", nsmgr);  
  
            IDictionary<string, string> result = getNamespacesInScope(nodemsg);  
  
        }  
        public static IDictionary<string, string> getNamespacesInScope(XmlNode xDoc)  
        {  
            IDictionary<string, string> AllNamespaces = new Dictionary<string,string>();  
            IDictionary<string, string> localNamespaces;  
            
            XmlNode temp = xDoc;  
            XPathNavigator xNav;  
            while (temp.ParentNode!=null)  
            {  
                xNav = temp.CreateNavigator();  
                localNamespaces = xNav.GetNamespacesInScope(XmlNamespaceScope.Local);  
                foreach (var item in localNamespaces)  
                {  
                    if (!AllNamespaces.ContainsKey(item.Key))  
                    {  
                        AllNamespaces.Add(item);  
                    }  
                }  
                temp = temp.ParentNode;  
            }  
            return AllNamespaces;  
        }  

Example xml I used:

<?xml version="1.0" encoding="utf-8" ?>  
<x:root xmlns:x="ur11" xmlns:y="uri2" xmlns:z="uri3">  
  <y:employees xmlns:y="uriA">  
    <z:person xmlns:z ="uriZ"/>  
  </y:employees>  
</x:root>  

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