SiteMapNode.Url Property

Definition

Ottiene o imposta l'URL della pagina rappresentata dall'oggetto SiteMapNode.Gets or sets the URL of the page that the SiteMapNode object represents.

public:
 virtual property System::String ^ Url { System::String ^ get(); void set(System::String ^ value); };
public virtual string Url { get; set; }
member this.Url : string with get, set
Public Overridable Property Url As String

Property Value

String

URL della pagina rappresentata dal nodo.The URL of the page that the node represents. Il valore predefinito è Empty.The default is Empty.

Exceptions

Il nodo è di sola lettura.The node is read-only.

Examples

Nell'esempio di codice riportato di seguito viene illustrato come impostare la proprietà Url di un oggetto SiteMapNode.The following code example demonstrates how to set the Url property of a SiteMapNode object. Il AccessSiteMapProvider archivia il nodo radice come una riga senza parentnodeid definito.The AccessSiteMapProvider stores its root node as a row that has no parentnodeid defined. La riga viene restituita utilizzando un oggetto OleDbDataReader e SiteMapNode proprietà vengono impostate dai valori nel lettore dati.The row is returned using an OleDbDataReader object, and SiteMapNode properties are set from the values in the data reader.

Questo esempio di codice fa parte di un esempio più ampio fornito per la classe SiteMapProvider.This code example is part of a larger example provided for the SiteMapProvider class.

// Build an in-memory representation from persistent
// storage, and return the root node of the site map.
virtual SiteMapNode ^ BuildSiteMap() override
{
   // Since the SiteMap class is static, make sure that it is
   // not modified while the site map is built.
   System::Threading::Monitor::Enter( this );
   try
   {
      
      // If there is no initialization, this method is being
      // called out of order.
      if (  !IsInitialized )
      {
         throw gcnew Exception( "BuildSiteMap called incorrectly." );
      }
      
      // If there is no root node, then there is no site map.
      if ( nullptr == rootNode )
      {
         
         // Start with a clean slate
         Clear();
         
         // Select the root node of the site map from Microsoft Access.
         int rootNodeId = -1;
         if ( accessConnection->State == ConnectionState::Closed )
            accessConnection->Open();
         
         OleDbCommand^ rootNodeCommand = gcnew OleDbCommand
            ("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid IS NULL", accessConnection);
         OleDbDataReader^ rootNodeReader = rootNodeCommand->ExecuteReader();
         if ( rootNodeReader->HasRows )
         {
            rootNodeReader->Read();
            rootNodeId = rootNodeReader->GetInt32( 0 );
            
            // Create a SiteMapNode that references the current StaticSiteMapProvider.
            rootNode = gcnew SiteMapNode(this, rootNodeId.ToString(), 
               rootNodeReader->GetString( 1 ),rootNodeReader->GetString( 2 ));
         }
         else
            return nullptr;
         rootNodeReader->Close();
         
         // Select the child nodes of the root node.
         OleDbCommand^ childNodesCommand = gcnew OleDbCommand
            ("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid = ?", accessConnection);
         OleDbParameter^ rootParam = gcnew OleDbParameter( "parentid", OleDbType::Integer);
         rootParam->Value = rootNodeId;
         childNodesCommand->Parameters->Add( rootParam );
         OleDbDataReader^ childNodesReader = childNodesCommand->ExecuteReader();
         if ( childNodesReader->HasRows )
         {
            SiteMapNode ^ childNode = nullptr;
            while ( childNodesReader->Read() )
            {
               childNode = gcnew SiteMapNode( this, 
                   System::Convert::ToString(childNodesReader->GetInt32( 0 )),
                  childNodesReader->GetString( 1 ),
                  childNodesReader->GetString( 2 ) 
               );
               // Use the SiteMapNode AddNode method to add
               // the SiteMapNode to the ChildNodes collection.
               AddNode( childNode, rootNode );
            }
         }
         childNodesReader->Close();
         accessConnection->Close();
      }
      return rootNode;
   }
   finally
   {
      System::Threading::Monitor::Exit( this );
   }

}

// Build an in-memory representation from persistent
// storage, and return the root node of the site map.
public override SiteMapNode BuildSiteMap() {

    // Since the SiteMap class is static, make sure that it is
    // not modified while the site map is built.
    lock(this) {

        // If there is no initialization, this method is being
        // called out of order.
        if (! IsInitialized) {
            throw new Exception("BuildSiteMap called incorrectly.");
        }

        // If there is no root node, then there is no site map.
        if (null == rootNode) {
            // Start with a clean slate
            Clear();

            // Select the root node of the site map from Microsoft Access.
            int rootNodeId = -1;

            if (accessConnection.State == ConnectionState.Closed)
                accessConnection.Open();
            OleDbCommand rootNodeCommand =
                new OleDbCommand("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid IS NULL",
                                 accessConnection);
            OleDbDataReader rootNodeReader = rootNodeCommand.ExecuteReader();

            if(rootNodeReader.HasRows) {
                rootNodeReader.Read();
                rootNodeId = rootNodeReader.GetInt32(0);
                // Create a SiteMapNode that references the current StaticSiteMapProvider.
                rootNode   = new SiteMapNode(this,
                                             rootNodeId.ToString(),
                                             rootNodeReader.GetString(1),
                                             rootNodeReader.GetString(2));
            }
            else
            {
                return null;
            }

            rootNodeReader.Close();
            // Select the child nodes of the root node.
            OleDbCommand childNodesCommand =
                new OleDbCommand("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid = ?",
                                 accessConnection);
            OleDbParameter rootParam = new OleDbParameter("parentid", OleDbType.Integer);
            rootParam.Value = rootNodeId;
            childNodesCommand.Parameters.Add(rootParam);

            OleDbDataReader childNodesReader = childNodesCommand.ExecuteReader();

            if (childNodesReader.HasRows) {

                SiteMapNode childNode = null;
                while(childNodesReader.Read()) {
                    childNode =  new SiteMapNode(this,
                                                 childNodesReader.GetInt32(0).ToString(),
                                                 childNodesReader.GetString(1),
                                                 childNodesReader.GetString(2));

                    // Use the SiteMapNode AddNode method to add
                    // the SiteMapNode to the ChildNodes collection.
                    AddNode(childNode, rootNode);
                }
            }

            childNodesReader.Close();
            accessConnection.Close();
        }
        return rootNode;
    }
}
' Build an in-memory representation from persistent
' storage, and return the root node of the site map.
Public Overrides Function BuildSiteMap() As SiteMapNode

    ' Since the SiteMap class is static, make sure that it is
    ' not modified while the site map is built.
    SyncLock Me

        ' If there is no initialization, this method is being
        ' called out of order.
        If Not IsInitialized Then
            Throw New Exception("BuildSiteMap called incorrectly.")
        End If

        ' If there is no root node, then there is no site map.
        If aRootNode Is Nothing Then
            ' Start with a clean slate
            Clear()

            ' Select the root node of the site map from Microsoft Access.
            Dim rootNodeId As Integer = -1

            If accessConnection.State = ConnectionState.Closed Then
                accessConnection.Open()
            End If
            Dim rootNodeCommand As New OleDbCommand("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid IS NULL", accessConnection)
            Dim rootNodeReader As OleDbDataReader = rootNodeCommand.ExecuteReader()

            If rootNodeReader.HasRows Then
                rootNodeReader.Read()
                rootNodeId = rootNodeReader.GetInt32(0)
                ' Create a SiteMapNode that references the current StaticSiteMapProvider.
                aRootNode = New SiteMapNode(Me, rootNodeId.ToString(), rootNodeReader.GetString(1), rootNodeReader.GetString(2))
            Else
                Return Nothing
            End If
            rootNodeReader.Close()
            ' Select the child nodes of the root node.
            Dim childNodesCommand As New OleDbCommand("SELECT nodeid, url, name FROM SiteMap WHERE parentnodeid = ?", accessConnection)
            Dim rootParam As New OleDbParameter("parentid", OleDbType.Integer)
            rootParam.Value = rootNodeId
            childNodesCommand.Parameters.Add(rootParam)

            Dim childNodesReader As OleDbDataReader = childNodesCommand.ExecuteReader()

            If childNodesReader.HasRows Then

                Dim childNode As SiteMapNode = Nothing
                While childNodesReader.Read()
                    childNode = New SiteMapNode(Me, _
                    childNodesReader.GetInt32(0).ToString(), _
                    childNodesReader.GetString(1), _
                    childNodesReader.GetString(2))

                    ' Use the SiteMapNode AddNode method to add
                    ' the SiteMapNode to the ChildNodes collection.
                    AddNode(childNode, aRootNode)
                End While
            End If

            childNodesReader.Close()
            accessConnection.Close()
        End If
        Return aRootNode
    End SyncLock

End Function 'BuildSiteMap

Remarks

La classe XmlSiteMapProvider, che rappresenta l'implementazione predefinita del provider della mappa del sito per ASP.NET, utilizza la proprietà SiteMapNode.Url come chiave di ricerca.The XmlSiteMapProvider class, which is the default site map provider implementation for ASP.NET, uses the SiteMapNode.Url property as a lookup key. Pertanto, qualsiasi SiteMapNode oggetto utilizzato dalla classe XmlSiteMapProvider deve disporre di un URL univoco nell'ambito del provider.Therefore, any SiteMapNode object that is used by the XmlSiteMapProvider class must have a unique URL within the scope of the provider.

Gli spazi vuoti iniziali e finali vengono ignorati.Leading and trailing white-space characters are ignored.

Applies to

See also