/// <summary>
/// This method gets the nodes from the xml nodes which are the fields needed for the NaviationDisplayInfo
/// </summary>
/// <param name="xml">xml node passed</param>
/// <returns>the parsed navigation display info</returns>
private static NavigationDisplayInfo ParseTree(XmlNode xml)
{
XmlNode navDisplayParamNode = xml.SelectSingleNode("./DisplayParams");
XmlNode navItemNode = xml.SelectSingleNode("./NavItem");
if (navDisplayParamNode == null)
{
log.Error("DisplayParams is null.");
log.Error(xml.OuterXml);
throw new Exception("Error: DisplayParams is null");
}
// Load details (if any) of the Navigation Item.
NavigationItem item = null;
if (navItemNode != null)
{
item = NavigationItem.ParseTree(navItemNode);
}
NavigationDisplayParams display = NavigationDisplayParams.ParseElement(navDisplayParamNode);
NavigationDisplayInfo result = new NavigationDisplayInfo(item, display);
return(result);
}
/// <summary>
/// Inititates the parse to get the xml from the snippet infos
/// </summary>
/// <param name="xml">the xml passed</param>
/// <returns>the Navigation Display info</returns>
public static NavigationDisplayInfo ParseTree(string xml)
{
XmlDocument doc = new XmlDocument();
bool docLoaded = false;
try
{
doc.LoadXml(xml);
docLoaded = true; // Won't hit this line if there's an error loading.
}
catch (Exception ex)
{
// Swallow the exception. We still get an error recorded, and
// the user still gets content, just without the navigation element.
log.Error("ParseTree(): Unable to load XML document" + xml, ex);
}
// If the XML string wasn't valid, don't try parsing the string. Just return an empty
// NavigationDisplayInfo structure.
NavigationDisplayInfo tree = null;
if (docLoaded)
{
tree = ParseTree(doc.DocumentElement);
}
else
{
tree = new NavigationDisplayInfo(null, null);
}
return(tree);
}
