Map Provider. Get Current Node And Hint Ancestor Nodes(Int32) Method
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Provides an optimized lookup method for site map providers when retrieving the node for the currently requested page and fetching the parent and ancestor site map nodes for the current page.
public: virtual System::Web::SiteMapNode ^ GetCurrentNodeAndHintAncestorNodes(int upLevel);
public virtual System.Web.SiteMapNode GetCurrentNodeAndHintAncestorNodes (int upLevel);
abstract member GetCurrentNodeAndHintAncestorNodes : int -> System.Web.SiteMapNode override this.GetCurrentNodeAndHintAncestorNodes : int -> System.Web.SiteMapNode
Public Overridable Function GetCurrentNodeAndHintAncestorNodes (upLevel As Integer) As SiteMapNode
The number of ancestor site map node generations to get. A value of -1 indicates that all ancestors might be retrieved and cached by the provider.
upLevel is less than -1.
The default implementation of the GetCurrentNodeAndHintAncestorNodes method returns the CurrentNode property; however, site map providers can override the GetCurrentNodeAndHintAncestorNodes method and provide an optimized implementation that uses custom caching mechanisms to return the current SiteMapNode, as well as the parent and ancestor nodes of the parent.
upLevel parameter is used to specify how many levels of parent and ancestor nodes to retrieve. If preferred, the parent and ancestor nodes can be linked to the SiteMapNode object that is returned by the GetCurrentNodeAndHintAncestorNodes method, using the ParentNode property.
The XmlSiteMapProvider class, which is the default site map provider for ASP.NET, caches the entire site map in memory, which results in little or no overhead when querying the XmlSiteMapProvider for specific SiteMapNode objects.