SiteMapNodeCollection.Add(SiteMapNode) SiteMapNodeCollection.Add(SiteMapNode) SiteMapNodeCollection.Add(SiteMapNode) SiteMapNodeCollection.Add(SiteMapNode) Method

Definition

Fügt der Auflistung ein einzelnes SiteMapNode-Objekt hinzu.Adds a single SiteMapNode object to the collection.

public:
 virtual int Add(System::Web::SiteMapNode ^ value);
public virtual int Add (System.Web.SiteMapNode value);
abstract member Add : System.Web.SiteMapNode -> int
override this.Add : System.Web.SiteMapNode -> int
Public Overridable Function Add (value As SiteMapNode) As Integer

Parameter

Gibt zurück

Der Index der InnerList, in die der SiteMapNode eingefügt wurde.The index of the InnerList where the SiteMapNode was inserted.

Ausnahmen

Beispiele

Dieser Abschnitt enthält zwei Codebeispiele.This section contains two code examples. Im ersten Codebeispiel wird veranschaulicht, wie Sie eine SiteMapNodeCollection neue Auflistung erstellen und dieser Elemente hinzufügen.The first code example demonstrates how to create a new SiteMapNodeCollection collection and add elements to it. Im zweiten Codebeispiel wird veranschaulicht, wie einem benutzerdefinierten Site Übersichts Anbieter Elemente hinzugefügt werden.The second code example demonstrates how to add elements to a custom site map provider.

Im folgenden Codebeispiel wird veranschaulicht, wie der SiteMapNodeCollection -Konstruktor verwendet wird, SiteMapNodeCollectionum ein neues zu erstellen, und dann mit Add der-Methode Elemente hinzuzufügen.The following code example demonstrates how to use the SiteMapNodeCollection constructor to create a new SiteMapNodeCollection, and then add elements to it with the Add method.

// The LoadSiteMapData() method loads site navigation
// data from persistent storage into a DataTable.
DataTable siteMap = LoadSiteMapData();

// Create a SiteMapNodeCollection.
SiteMapNodeCollection nodes = new SiteMapNodeCollection();

// Create a SiteMapNode and add it to the collection.
SiteMapNode tempNode;
DataRow row;
int index = 0;

while (index < siteMap.Rows.Count)
{

    row = siteMap.Rows[index];

    // Create a node based on the data in the DataRow.
    tempNode = new SiteMapNode(SiteMap.Provider,
                                row["Key"].ToString(),
                                row["Url"].ToString());

    // Add the node to the collection.
    nodes.Add(tempNode);
    ++index;
}
' The LoadSiteMapData() Function loads site navigation
' data from persistent storage into a DataTable.

Dim siteMapData As DataTable
siteMapData = LoadSiteMapData()

' Create a SiteMapNodeCollection.
Dim nodes As New SiteMapNodeCollection()

' Create a SiteMapNode and add it to the collection.
Dim tempNode As SiteMapNode
Dim row As DataRow
Dim index As Integer
index = 0

While (index < siteMapData.Rows.Count)

    row = siteMapData.Rows(index)

    ' Create a node based on the data in the DataRow.
    tempNode = New SiteMapNode(SiteMap.Provider, row("Key").ToString(), row("Url").ToString())

    ' Add the node to the collection.
    nodes.Add(tempNode)
    index = index + 1
End While

Das folgende Codebeispiel veranschaulicht die Implementierung eines benutzerdefinierten Site Map-Anbieters und zeigt, SiteMapNodeCollection wie der SiteMapNodeCollection -Konstruktor verwendet SiteMapNodeCollection wird, um ein neues zu erstellen Add und mit der-Methode Elemente hinzuzufügen.The following code example demonstrates a custom site map provider implementation and shows how to use the SiteMapNodeCollection constructor to create a new SiteMapNodeCollection and add elements to the SiteMapNodeCollection with the Add method.

Dieses Codebeispiel ist Teil eines größeren Code Beispiels, das für die SiteMapProvider -Klasse bereitgestellt wird.This code example is part of a larger code example provided for the SiteMapProvider class.

// Implement the GetChildNodes method.
public override SiteMapNodeCollection GetChildNodes(SiteMapNode node)
{
  SiteMapNodeCollection children = new SiteMapNodeCollection();
  // Iterate through the ArrayList and find all nodes that have the specified node as a parent.
  lock (this)
  {
    for (int i = 0; i < childParentRelationship.Count; i++)
    {

      string nodeUrl = ((DictionaryEntry)childParentRelationship[i]).Key as string;

      SiteMapNode parent = GetNode(childParentRelationship, nodeUrl);

      if (parent != null && node.Url == parent.Url)
      {
        // The SiteMapNode with the Url that corresponds to nodeUrl
        // is a child of the specified node. Get the SiteMapNode for
        // the nodeUrl.
        SiteMapNode child = FindSiteMapNode(nodeUrl);
        if (child != null)
        {
          children.Add(child as SiteMapNode);
        }
        else
        {
          throw new Exception("ArrayLists not in sync.");
        }
      }
    }
  }
  return children;
}
protected override SiteMapNode GetRootNodeCore()
{
  return RootNode;
}
// Implement the GetParentNode method.
public override SiteMapNode GetParentNode(SiteMapNode node)
{
  // Check the childParentRelationship table and find the parent of the current node.
  // If there is no parent, the current node is the RootNode.
  SiteMapNode parent = null;
  lock (this)
  {
    // Get the Value of the node in childParentRelationship
    parent = GetNode(childParentRelationship, node.Url);
  }
  return parent;
}
' Implement the GetChildNodes method.
Public Overrides Function GetChildNodes(ByVal node As SiteMapNode) As SiteMapNodeCollection
  Dim children As New SiteMapNodeCollection()
  ' Iterate through the ArrayList and find all nodes that have the specified node as a parent.
  SyncLock Me
    Dim i As Integer
    For i = 0 To childParentRelationship.Count - 1

      Dim de As DictionaryEntry = CType(childParentRelationship(i), DictionaryEntry)
      Dim nodeUrl As String = CType(de.Key, String)

      Dim parent As SiteMapNode = GetNode(childParentRelationship, nodeUrl)

      If Not (parent Is Nothing) AndAlso node.Url = parent.Url Then
        ' The SiteMapNode with the Url that corresponds to nodeUrl
        ' is a child of the specified node. Get the SiteMapNode for
        ' the nodeUrl.
        Dim child As SiteMapNode = FindSiteMapNode(nodeUrl)
        If Not (child Is Nothing) Then
          children.Add(CType(child, SiteMapNode))
        Else
          Throw New Exception("ArrayLists not in sync.")
        End If
      End If
    Next i
  End SyncLock
  Return children
End Function 'GetChildNodes

Protected Overrides Function GetRootNodeCore() As SiteMapNode
  Return RootNode
End Function ' GetRootNodeCore()

' Implement the GetParentNode method.
Public Overrides Function GetParentNode(ByVal node As SiteMapNode) As SiteMapNode
  ' Check the childParentRelationship table and find the parent of the current node.
  ' If there is no parent, the current node is the RootNode.
  Dim parent As SiteMapNode = Nothing
  SyncLock Me
    ' Get the Value of the node in childParentRelationship
    parent = GetNode(childParentRelationship, node.Url)
  End SyncLock
  Return parent
End Function 'GetParentNode

Hinweise

Ein- SiteMapNode Objekt kann nicht zu einer Auflistung mit Schreib geschütztem oder fester SiteMapNodeCollection Größe hinzugefügt werden.You cannot add a SiteMapNode object to a read-only or fixed-size SiteMapNodeCollection collection. Sie können testen, ob SiteMapNodeCollection ein schreibgeschützt ist, indem Sie IsReadOnly die-Eigenschaft überprüfen.You can test whether a SiteMapNodeCollection is read-only by checking the IsReadOnly property.

Gilt für:

Siehe auch