Retrieves a SiteMapNode object based on a specified key.
Assembly: System.Web (in System.Web.dll)
A child provider linked to the current site map provider returned a node that is not valid.
The XmlSiteMapProvider class overrides the FindSiteMapNodeFromKey method to ensure that any linked child providers are searched for the node, if the implementation for the base class does not return a node for key.
The XmlSiteMapProvider object, derived from the StaticSiteMapProvider class and the default site map provider for ASP.NET, uses the Url property of a SiteMapNode object as a lookup key in its internal collections, by default. If the Url property of the SiteMapNode is set, it must be unique within the scope of the provider. If no Url is specified, the XmlSiteMapProvider automatically generates a Key to track the nodes.
The method might call the BuildSiteMap method on any child providers that are associated with the current provider. Therefore, the exceptions that are described in the BuildSiteMap method might be thrown.