Assembly : System.Windows.Forms (dans system.windows.forms.dll)
SyntaxePublic Sub EndUpdate
Dim instance As TreeView instance.EndUpdate
public void EndUpdate ()
public: void EndUpdate ()
public void EndUpdate ()
public function EndUpdate ()
NotesPour maintenir les performances quand des éléments sont ajoutés un par un à TreeView, appelez la méthode BeginUpdate. La méthode BeginUpdate empêche le contrôle d'être repeint jusqu'à l'appel à la méthode EndUpdate.
Le meilleur moyen d'ajouter plusieurs éléments d'un n?ud d'arbre à un contrôle TreeView consiste à utiliser la méthode AddRange, qui ajoute un tableau de ces éléments. Cependant, si vous souhaitez ajouter des éléments un par un, utilisez la méthode BeginUpdate pour empêcher le contrôle TreeView d'être repeint pendant les opérations d'ajout. Pour que le contrôle reprenne la peinture, appelez la méthode EndUpdate une fois que tous les n?uds d'arbre ont été ajoutés à l'arborescence.
ExempleL'exemple de code suivant affiche les informations client dans un contrôle TreeView. Les n?uds d'arbre racine affichent les noms des clients, tandis que les n?uds d'arbre enfants affichent les numéros de commande assignés à chaque client. Dans cet exemple, 1000 clients sont affichés avec 15 commandes chacun. Les méthodes BeginUpdate et EndUpdate permettent d'éviter que TreeView ne soit repeint et un Cursor d'attente est affiché pendant que TreeView crée et peint les objets TreeNode. Cet exemple suppose que vous disposez d'un objet Customer qui peut contenir une collection d'objets Order. Il requiert également que vous disposiez d'un fichier de curseur nommé MyWait.cur dans le répertoire de l'application et que vous ayez créé une instance d'un contrôle TreeView sur un Form.
' Create a new ArrayList to hold the Customer objects. Private customerArray As New ArrayList() Private Sub FillMyTreeView() ' Add customers to the ArrayList of Customer objects. Dim x As Integer For x = 0 To 999 customerArray.Add(New Customer("Customer" + x.ToString())) Next x ' Add orders to each Customer object in the ArrayList. Dim customer1 As Customer For Each customer1 In customerArray Dim y As Integer For y = 0 To 14 customer1.CustomerOrders.Add(New Order("Order" + y.ToString())) Next y Next customer1 ' Display a wait cursor while the TreeNodes are being created. Cursor.Current = New Cursor("MyWait.cur") ' Suppress repainting the TreeView until all the objects have been created. treeView1.BeginUpdate() ' Clear the TreeView each time the method is called. treeView1.Nodes.Clear() ' Add a root TreeNode for each Customer object in the ArrayList. Dim customer2 As Customer For Each customer2 In customerArray treeView1.Nodes.Add(New TreeNode(customer2.CustomerName)) ' Add a child TreeNode for each Order object in the current Customer object. Dim order1 As Order For Each order1 In customer2.CustomerOrders treeView1.Nodes(customerArray.IndexOf(customer2)).Nodes.Add( _ New TreeNode(customer2.CustomerName + "." + order1.OrderID)) Next order1 Next customer2 ' Reset the cursor to the default for all controls. Cursor.Current = System.Windows.Forms.Cursors.Default ' Begin repainting the TreeView. treeView1.EndUpdate() End Sub 'FillMyTreeView
// Create a new ArrayList to hold the Customer objects. private ArrayList customerArray = new ArrayList(); private void FillMyTreeView() { // Add customers to the ArrayList of Customer objects. for(int x=0; x<1000; x++) { customerArray.Add(new Customer("Customer" + x.ToString())); } // Add orders to each Customer object in the ArrayList. foreach(Customer customer1 in customerArray) { for(int y=0; y<15; y++) { customer1.CustomerOrders.Add(new Order("Order" + y.ToString())); } } // Display a wait cursor while the TreeNodes are being created. Cursor.Current = new Cursor("MyWait.cur"); // Suppress repainting the TreeView until all the objects have been created. treeView1.BeginUpdate(); // Clear the TreeView each time the method is called. treeView1.Nodes.Clear(); // Add a root TreeNode for each Customer object in the ArrayList. foreach(Customer customer2 in customerArray) { treeView1.Nodes.Add(new TreeNode(customer2.CustomerName)); // Add a child treenode for each Order object in the current Customer object. foreach(Order order1 in customer2.CustomerOrders) { treeView1.Nodes[customerArray.IndexOf(customer2)].Nodes.Add( new TreeNode(customer2.CustomerName + "." + order1.OrderID)); } } // Reset the cursor to the default for all controls. Cursor.Current = Cursors.Default; // Begin repainting the TreeView. treeView1.EndUpdate(); }
void FillMyTreeView() { // Add customers to the ArrayList of Customer objects. for ( int x = 0; x < 1000; x++ ) { customerArray->Add( gcnew Customer( "Customer " + x ) ); } // Add orders to each Customer object in the ArrayList. IEnumerator^ myEnum = customerArray->GetEnumerator(); while ( myEnum->MoveNext() ) { Customer^ customer1 = safe_cast<Customer^>(myEnum->Current); for ( int y = 0; y < 15; y++ ) { customer1->CustomerOrders->Add( gcnew Order( "Order " + y ) ); } } // Display a wait cursor while the TreeNodes are being created. ::Cursor::Current = gcnew System::Windows::Forms::Cursor( "MyWait.cur" ); // Suppress repainting the TreeView until all the objects have been created. treeView1->BeginUpdate(); // Clear the TreeView each time the method is called. treeView1->Nodes->Clear(); // Add a root TreeNode for each Customer object in the ArrayList. while ( myEnum->MoveNext() ) { Customer^ customer2 = safe_cast<Customer^>(myEnum->Current); treeView1->Nodes->Add( gcnew TreeNode( customer2->CustomerName ) ); // Add a child treenode for each Order object in the current Customer object. IEnumerator^ myEnum = customer2->CustomerOrders->GetEnumerator(); while ( myEnum->MoveNext() ) { Order^ order1 = safe_cast<Order^>(myEnum->Current); treeView1->Nodes[ customerArray->IndexOf( customer2 ) ]->Nodes->Add( gcnew TreeNode( customer2->CustomerName + "." + order1->OrderID ) ); } } // Reset the cursor to the default for all controls. ::Cursor::Current = Cursors::Default; // Begin repainting the TreeView. treeView1->EndUpdate(); }
// Create a new ArrayList to hold the Customer objects. private ArrayList customerArray = new ArrayList(); private void FillMyTreeView() { // Add customers to the ArrayList of Customer objects. for (int x = 0; x < 1000; x++) { customerArray.Add(new Customer("Customer" + ((Int32)x).ToString())); } // Add orders to each Customer object in the ArrayList. for (int iCtr = 0; iCtr < customerArray.get_Count(); iCtr++) { Customer customer1 = (Customer)customerArray.get_Item(iCtr); for (int y = 0; y < 15; y++) { customer1.get_CustomerOrders().Add(new Order("Order" + ((Int32)y).ToString())); } } // Display a wait cursor while the TreeNodes are being created. get_Cursor().set_Current(new Cursor("MyWait.cur")); // Suppress repainting the TreeView until all the objects have // been created. treeView1.BeginUpdate(); // Clear the TreeView each time the method is called. treeView1.get_Nodes().Clear(); // Add a root TreeNode for each Customer object in the ArrayList. for (int iCtr1 = 0; iCtr1 < customerArray.get_Count(); iCtr1++) { Customer customer2 = (Customer)customerArray.get_Item(iCtr1); treeView1.get_Nodes().Add(new TreeNode(customer2.get_CustomerName())); // Add a child treenode for each Order object in the current // Customer object. for (int iCtr2 = 0; iCtr2 < customer2.get_CustomerOrders(). get_Count(); iCtr2++) { Order order1 = (Order)customer2.get_CustomerOrders(). get_Item(iCtr2); treeView1.get_Nodes(). get_Item(customerArray.IndexOf(customer2)).get_Nodes(). Add(new TreeNode(customer2.get_CustomerName() + "." + order1.get_OrderID())); } } // Reset the cursor to the default for all controls. get_Cursor().set_Current(Cursors.get_Default()); // Begin repainting the TreeView. treeView1.EndUpdate(); } //FillMyTreeView
Plates-formesWindows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile pour Pocket PC, Windows Mobile pour Smartphone, Windows Server 2003, Windows XP Édition Media Center, Windows XP Professionnel Édition x64, Windows XP SP2, Windows XP Starter Edition
Le .NET Framework ne prend pas en charge toutes les versions de chaque plate-forme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise.
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