SiteMapResolveEventHandler Délégué

Définition

Représente la méthode qui va gérer l'événement SiteMapResolve d'une instance spécifique du SiteMapProvider ou de la classe statique SiteMap.Represents the method that will handle the SiteMapResolve event of a specific instance of the SiteMapProvider or static SiteMap class.

public delegate System::Web::SiteMapNode ^ SiteMapResolveEventHandler(System::Object ^ sender, SiteMapResolveEventArgs ^ e);
public delegate System.Web.SiteMapNode SiteMapResolveEventHandler(object sender, SiteMapResolveEventArgs e);
type SiteMapResolveEventHandler = delegate of obj * SiteMapResolveEventArgs -> SiteMapNode
Public Delegate Function SiteMapResolveEventHandler(sender As Object, e As SiteMapResolveEventArgs) As SiteMapNode 

Paramètres

sender
Object

La source de l'événement, une instance de la classe SiteMapProvider.The source of the event, an instance of the SiteMapProvider class.

e
SiteMapResolveEventArgs

SiteMapResolveEventArgs qui contient les données d'événement.A SiteMapResolveEventArgs that contains the event data.

Valeur renvoyée

SiteMapNode

SiteMapNode qui représente le résultat de l'opération SiteMapResolveEventHandler.The SiteMapNode that represents the result of the SiteMapResolveEventHandler operation.

Héritage
SiteMapResolveEventHandler

Exemples

L’exemple de code suivant montre comment gérer l' SiteMapResolve événement sur une page Web ASP.net pour modifier les URL cibles affichées par un contrôle de navigation de site, tel que le SiteMapPath contrôle.The following code example demonstrates how to handle the SiteMapResolve event on an ASP.NET Web page to modify the target URLs that are displayed by a site navigation control, such as the SiteMapPath control. Dans cet exemple, la page actuelle est une page de publication dans un forum ou un forum de bulletins.In this example, the current page is a post page in an online bulletin board or forum. Afin d’obtenir une navigation de site plus explicite, les URL des nœuds affichés par le contrôle de navigation sont ajoutées aux chaînes de requête pertinentes pour le contexte.In order to render more meaningful site navigation, the URLs of the nodes that are displayed by the navigation control are appended with query strings that are relevant to the context.

Notes

Il est possible d’accéder en CurrentNode toute sécurité à la SiteMapResolveEventHandler propriété à partir de la classe.It is safe to access the CurrentNode property from within the SiteMapResolveEventHandler class. Dans ce cas, l’infrastructure de navigation de site ASP.NET protège contre la récurrence infinie.The ASP.NET site navigation infrastructure guards against infinite recursion, in this case.

private void Page_Load(object sender, EventArgs e)
{
    // The ExpandForumPaths method is called to handle
    // the SiteMapResolve event.
    SiteMap.SiteMapResolve +=
      new SiteMapResolveEventHandler(this.ExpandForumPaths);
}

private SiteMapNode ExpandForumPaths(Object sender, SiteMapResolveEventArgs e)
{
    // The current node represents a Post page in a bulletin board forum.
    // Clone the current node and all of its relevant parents. This
    // returns a site map node that a developer can then
    // walk, modifying each node.Url property in turn.
    // Since the cloned nodes are separate from the underlying
    // site navigation structure, the fixups that are made do not
    // effect the overall site navigation structure.
    SiteMapNode currentNode = SiteMap.CurrentNode.Clone(true);
    SiteMapNode tempNode = currentNode;

    // Obtain the recent IDs.
    int forumGroupID = GetMostRecentForumGroupID();
    int forumID = GetMostRecentForumID(forumGroupID);
    int postID = GetMostRecentPostID(forumID);

    // The current node, and its parents, can be modified to include
    // dynamic querystring information relevant to the currently
    // executing request.
    if (0 != postID)
    {
        tempNode.Url = tempNode.Url + "?PostID=" + postID.ToString();
    }

    if ((null != (tempNode = tempNode.ParentNode)) &&
        (0 != forumID))
    {
        tempNode.Url = tempNode.Url + "?ForumID=" + forumID.ToString();
    }

    if ((null != (tempNode = tempNode.ParentNode)) &&
        (0 != forumGroupID))
    {
        tempNode.Url = tempNode.Url + "?ForumGroupID=" + forumGroupID.ToString();
    }

    return currentNode;
}
Private Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' The ExpandForumPaths method is called to handle
    ' the SiteMapResolve event.
    AddHandler SiteMap.SiteMapResolve, AddressOf Me.ExpandForumPaths

End Sub

Private Function ExpandForumPaths(ByVal sender As Object, ByVal e As SiteMapResolveEventArgs) As SiteMapNode
    ' The current node represents a Post page in a bulletin board forum.
    ' Clone the current node and all of its relevant parents. This
    ' returns a site map node that a developer can then
    ' walk, modifying each node.Url property in turn.
    ' Since the cloned nodes are separate from the underlying
    ' site navigation structure, the fixups that are made do not
    ' effect the overall site navigation structure.
    Dim currentNode As SiteMapNode = SiteMap.CurrentNode.Clone(True)
    Dim tempNode As SiteMapNode = currentNode

    ' Obtain the recent IDs.
    Dim forumGroupID As Integer = GetMostRecentForumGroupID()
    Dim forumID As Integer = GetMostRecentForumID(forumGroupID)
    Dim postID As Integer = GetMostRecentPostID(forumID)

    ' The current node, and its parents, can be modified to include
    ' dynamic querystring information relevant to the currently
    ' executing request.
    If Not (0 = postID) Then
        tempNode.Url = tempNode.Url & "?PostID=" & postID.ToString()
    End If

    tempNode = tempNode.ParentNode
    If Not (0 = forumID) And Not (tempNode Is Nothing) Then
        tempNode.Url = tempNode.Url & "?ForumID=" & forumID.ToString()
    End If

    tempNode = tempNode.ParentNode
    If Not (0 = ForumGroupID) And Not (tempNode Is Nothing) Then
        tempNode.Url = tempNode.Url & "?ForumGroupID=" & forumGroupID.ToString()
    End If

    Return currentNode

End Function

Remarques

La classe SiteMap statique expose l' SiteMapResolve événement du fournisseur de plan de site par défaut.The static SiteMap class exposes the SiteMapResolve event of the default site map provider.

Lorsque vous créez un délégué SqlDataSourceCommandEventHandler, vous identifiez la méthode qui gérera l'événement.When you create a SqlDataSourceCommandEventHandler delegate, you identify the method that will handle the event. Pour associer l'événement au gestionnaire d'événements, ajoutez une instance du délégué à l'événement.To associate the event with your event handler, add an instance of the delegate to the event. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué.The event handler is called whenever the event occurs, unless you remove the delegate. Pour plus d’informations sur les délégués de gestionnaires d’événements, consultez gestion et déclenchement d’événements.For more information about event handler delegates, see Handling and Raising Events.

Méthodes d’extension

GetMethodInfo(Delegate)

Obtient un objet qui représente la méthode représentée par le délégué spécifié.Gets an object that represents the method represented by the specified delegate.

S’applique à

Voir aussi