SiteMap.CurrentNode Property

Reference

Definition

Namespace:: System.Web

Assembly:: System.Web.dll

Important

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.

Gets a SiteMapNode control that represents the currently requested page.

public:
 static property System::Web::SiteMapNode ^ CurrentNode { System::Web::SiteMapNode ^ get(); };

public static System.Web.SiteMapNode CurrentNode { get; }

static member CurrentNode : System.Web.SiteMapNode

Public Shared ReadOnly Property CurrentNode As SiteMapNode

Property Value

SiteMapNode

A SiteMapNode instance that represents the currently requested page; otherwise, null, if no representative node exists in the site map information.

Exceptions

InvalidOperationException

The site map feature is not enabled.

ConfigurationErrorsException

The default provider specified in the configuration does not exist.

HttpException

The feature is supported only when running in Low trust or higher.

Examples

The following code example demonstrates how to use the CurrentNode property to retrieve the SiteMapNode object that represents the current page.

<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
    // Examine the CurrentNode, and navigate the SiteMap relative to it.
    Response.Write(SiteMap.CurrentNode.Title + "<br />");
    Response.Write("<font COLOR='red'>" + SiteMap.CurrentNode.Url + "</font><br />");

    // What nodes are children of the CurrentNode?
    if (SiteMap.CurrentNode.HasChildNodes) {
        IEnumerator childNodesEnumerator = SiteMap.CurrentNode.ChildNodes.GetEnumerator();
        while (childNodesEnumerator.MoveNext()) {
            // Prints the Title of each node.
            Response.Write(childNodesEnumerator.Current.ToString() + "<br />");
        }
    }
    Response.Write("<hr />");

    // Examine the RootNode, and navigate the SiteMap relative to it.
    Response.Write(SiteMap.RootNode.Title + "<br />");
    Response.Write(SiteMap.RootNode.Url + "<br />");

    // What nodes are children of the RootNode?
    if (SiteMap.RootNode.HasChildNodes) {
        IEnumerator rootNodesChildrenEnumerator = SiteMap.RootNode.ChildNodes.GetEnumerator();
        while (rootNodesChildrenEnumerator.MoveNext()) {
            // Prints the Title of each node.
            Response.Write(rootNodesChildrenEnumerator.Current.ToString() + "<br />");
        }
    }
}
</script>

<script runat="server">

Private Sub Page_Load(sender As Object, e As EventArgs)

    ' Examine the CurrentNode, and navigate the SiteMap relative to it.
    Response.Write(SiteMap.CurrentNode.Title & "<br />")
    Response.Write("<font COLOR='red'>" & SiteMap.CurrentNode.Url & "</font><br />")

    ' What nodes are children of the CurrentNode?
    If (SiteMap.CurrentNode.HasChildNodes) Then
        Dim ChildNodesEnumerator As IEnumerator = SiteMap.CurrentNode.ChildNodes.GetEnumerator()
        While (ChildNodesEnumerator.MoveNext())
            ' Prints the Title of each node.
            Response.Write(ChildNodesEnumerator.Current.ToString() & "<br />")
        End While
    End If
    Response.Write("<hr />")

    ' Examine the RootNode, and navigate the SiteMap relative to it.
    Response.Write(SiteMap.RootNode.Title & "<br />")
    Response.Write(SiteMap.RootNode.Url & "<br />")

    ' What nodes are children of the RootNode?
    If (SiteMap.RootNode.HasChildNodes) Then
        Dim RootNodesChildrenEnumerator As IEnumerator = SiteMap.RootNode.ChildNodes.GetEnumerator()
        While (RootNodesChildrenEnumerator.MoveNext())
            ' Prints the Title of each node.
            Response.Write(RootNodesChildrenEnumerator.Current.ToString() & "<br />")
        End While
    End If

End Sub ' Page_Load
</script>

Remarks

The SiteMap class retrieves the CurrentNode property by requesting it from the provider.

If no representative node exists for the page in the site map information, or if security trimming is enabled and the node cannot be returned for the current user, null is returned.

The SiteMapResolve event is raised by the default site map provider if one or more subscriptions exist.

If you implement your own SiteMapProvider object, you might create your own mechanism to find and retrieve the CurrentNode. However, if you extend the StaticSiteMapProvider class and use a URL-based scheme to identify pages, you can override the FindSiteMapNode method.

Applies to

Dela via