Grabs value of specified attribute from a site map node. If recursive search is specified, then search up the site map tree for the next ancestor node that contains a value for the specified attribute.

SiteMapTraverser.cs

        public static string GetNodeAttributeValue(SiteMapNode currentNode, string attributeName, bool recursive)
        {
            if (recursive)  // Do recursive search
            {
                string attributeValue = "";
                if (currentNode != null)
                {
                    attributeValue = GetNodeAttributeValue(currentNode, attributeName, false);  // Search node currently working with.
                    if (string.IsNullOrEmpty(attributeValue)) // If attribute not found, then check the parent node.
                    {
                        if (currentNode.ParentNode != null)
                        {
                            attributeValue = GetNodeAttributeValue(currentNode.ParentNode, attributeName, true);
                        }
                    }
                }
                return attributeValue;
            }
            else  // Search currentNode only
            {
                if (currentNode != null && currentNode[attributeName] != null)
                {
                    return currentNode[attributeName];
                }
                else
                {
                    return "";  // If attribute is not found return empty string.
                }
            }
        }