如何从sitemap.currentnode向后循环到sitemap.rootnode

你要找的房产是 SiteMapNode.ParentNode

SiteMapNode currentNode = SiteMap.CurrentNode;
SiteMapNode rootNode = SiteMap.RootNode;
Stack<SiteMapNode> nodeStack = new Stack<SiteMapNode>();

while (currentNode != rootNode)
{
    nodeStack.Push(currentNode);

    currentNode = currentNode.ParentNode;
}

// If you want to include RootNode in your list
nodeStack.Push(rootNode);

SiteMapNode[] breadCrumbs = nodeStack.ToArray();