TreeView.ImageList-Eigenschaft

Ruft die ImageList ab, die die von den Strukturknoten verwendeten Image-Objekte enthält, oder legt diese fest.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

Syntax

'Declaration
Public Property ImageList As ImageList
'Usage
Dim instance As TreeView
Dim value As ImageList

value = instance.ImageList

instance.ImageList = value

public ImageList ImageList { get; set; }

public:
property ImageList^ ImageList {
    ImageList^ get ();
    void set (ImageList^ value);
}

/** @property */
public ImageList get_ImageList ()

/** @property */
public void set_ImageList (ImageList value)

public function get ImageList () : ImageList

public function set ImageList (value : ImageList)

Eigenschaftenwert

Ruft die ImageList mit den von den Strukturknoten verwendeten Image-Objekten ab, oder legt diese fest. Der Standardwert ist NULL (Nothing in Visual Basic).

Hinweise

Wenn der Wert der ImageList-Eigenschaft nicht NULL (Nothing in Visual Basic) ist, wird von allen Strukturknoten das erste in der ImageList gespeicherte Image angezeigt.

Beispiel

Im folgenden Codebeispiel wird eine ImageList erstellt und einem TreeView-Steuerelement zugeordnet, und das TreeView-Steuerelement wird mit TreeNode-Objekten gefüllt. Den Strukturknoten werden Bilder aus der ImageList zugewiesen, die im ausgewählten oder nicht ausgewählten Zustand angezeigt werden. Für dieses Beispiel ist es erforderlich, dass eine Form mit einer TreeView und eine ArrayList mit Customer-Objekten vorhanden sind, die wiederum Order-Objekte enthalten. Des Weiteren wird davon ausgegangen, dass das Customer-Objekt und das Order-Objekt definiert sind.

Private Sub FillTreeView()
   ' Load the images in an ImageList.
   Dim myImageList As New ImageList()
   myImageList.Images.Add(Image.FromFile("Default.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"))
   myImageList.Images.Add(Image.FromFile("Root.gif"))
   myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"))
   myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"))
   
   ' Assign the ImageList to the TreeView.
   myTreeView.ImageList = myImageList
   
   ' Set the TreeView control's default image and selected image indexes.
   myTreeView.ImageIndex = 0
   myTreeView.SelectedImageIndex = 1
   
   ' Set the index of image from the 
   ' ImageList for selected and unselected tree nodes.
   Me.rootImageIndex = 2
   Me.selectedCustomerImageIndex = 3
   Me.unselectedCustomerImageIndex = 4
   Me.selectedOrderImageIndex = 5
   Me.unselectedOrderImageIndex = 6
   
   ' Create the root tree node.
   Dim rootNode As New TreeNode("CustomerList")
   rootNode.ImageIndex = rootImageIndex
   rootNode.SelectedImageIndex = rootImageIndex
   
   ' Add a main root tree node.
   myTreeView.Nodes.Add(rootNode)
   
   ' Add a root tree node for each Customer object in the ArrayList.
   Dim myCustomer As Customer
   For Each myCustomer In  customerArray
      ' Add a child tree node for each Order object.
      Dim countIndex As Integer = 0
      Dim myTreeNodeArray(myCustomer.CustomerOrders.Count) As TreeNode
      Dim myOrder As Order
      For Each myOrder In  myCustomer.CustomerOrders
         ' Add the Order tree node to the array.
         myTreeNodeArray(countIndex) = New TreeNode(myOrder.OrderID, _
            unselectedOrderImageIndex, selectedOrderImageIndex)
         countIndex += 1
      Next myOrder
      ' Add the Customer tree node.
      Dim customerNode As New TreeNode(myCustomer.CustomerName, _
         unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray)
      myTreeView.Nodes(0).Nodes.Add(customerNode)
   Next myCustomer
End Sub

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.Images.Add(Image.FromFile("Default.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.Images.Add(Image.FromFile("Root.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"));
    
    // Assign the ImageList to the TreeView.
    myTreeView.ImageList = myImageList;
    
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.ImageIndex = 0;
    myTreeView.SelectedImageIndex = 1;

    /* Set the index of image from the 
    ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.ImageIndex = rootImageIndex;
    rootNode.SelectedImageIndex = rootImageIndex;
      
    // Add a main root tree node.
    myTreeView.Nodes.Add(rootNode);

    // Add a root tree node for each Customer object in the ArrayList.
    foreach(Customer myCustomer in customerArray)
    {
        // Add a child tree node for each Order object.
        int countIndex=0;
        TreeNode[] myTreeNodeArray = new TreeNode[myCustomer.CustomerOrders.Count];
        foreach(Order myOrder in myCustomer.CustomerOrders)
        {
            // Add the Order tree node to the array.
            myTreeNodeArray[countIndex] = new TreeNode(myOrder.OrderID,
              unselectedOrderImageIndex, selectedOrderImageIndex);
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray);
        myTreeView.Nodes[0].Nodes.Add(customerNode);
    }
}

void FillTreeView()
{
   
   // Load the images in an ImageList.
   ImageList^ myImageList = gcnew ImageList;
   myImageList->Images->Add( Image::FromFile( "Default.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedDefault.gif" ) );
   myImageList->Images->Add( Image::FromFile( "Root.gif" ) );
   myImageList->Images->Add( Image::FromFile( "UnselectedCustomer.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedCustomer.gif" ) );
   myImageList->Images->Add( Image::FromFile( "UnselectedOrder.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedOrder.gif" ) );
   
   // Assign the ImageList to the TreeView.
   myTreeView->ImageList = myImageList;
   
   // Set the TreeView control's default image and selected image indexes.
   myTreeView->ImageIndex = 0;
   myTreeView->SelectedImageIndex = 1;
   
   /* Set the index of image from the
     ImageList for selected and unselected tree nodes.*/
   this->rootImageIndex = 2;
   this->selectedCustomerImageIndex = 3;
   this->unselectedCustomerImageIndex = 4;
   this->selectedOrderImageIndex = 5;
   this->unselectedOrderImageIndex = 6;
   
   // Create the root tree node.
   TreeNode^ rootNode = gcnew TreeNode( "CustomerList" );
   rootNode->ImageIndex = rootImageIndex;
   rootNode->SelectedImageIndex = rootImageIndex;
   
   // Add a main root tree node.
   myTreeView->Nodes->Add( rootNode );
   
   // Add a root tree node for each Customer object in the ArrayList.
   IEnumerator^ myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ myCustomer = safe_cast<Customer^>(myEnum->Current);
      
      // Add a child tree node for each Order object.
      int countIndex = 0;
      array<TreeNode^>^myTreeNodeArray = gcnew array<TreeNode^>(myCustomer->CustomerOrders->Count);
      IEnumerator^ myEnum = myCustomer->CustomerOrders->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         Order^ myOrder = safe_cast<Order^>(myEnum->Current);
         
         // Add the Order tree node to the array.
         myTreeNodeArray[ countIndex ] = gcnew TreeNode( myOrder->OrderID,unselectedOrderImageIndex,selectedOrderImageIndex );
         countIndex++;
      }
      TreeNode^ customerNode = gcnew TreeNode( myCustomer->CustomerName,unselectedCustomerImageIndex,selectedCustomerImageIndex,myTreeNodeArray );
      myTreeView->Nodes[ 0 ]->Nodes->Add( customerNode );
   }
}

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.get_Images().Add(Image.FromFile("Default.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.get_Images().Add(Image.FromFile("Root.gif"));
    myImageList.get_Images().Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.get_Images().Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedOrder.gif"));
    // Assign the ImageList to the TreeView.
    myTreeView.set_ImageList(myImageList);
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.set_ImageIndex(0);
    myTreeView.set_SelectedImageIndex(1);

    /* Set the index of image from the 
       ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.set_ImageIndex(rootImageIndex);
    rootNode.set_SelectedImageIndex(rootImageIndex);
    // Add a main root tree node.
    myTreeView.get_Nodes().Add(rootNode);
    // Add a root tree node for each Customer object in the ArrayList.
    for (int iCtr1 = 0; iCtr1 < customerArray.get_Count(); iCtr1++) {
        Customer myCustomer = (Customer)customerArray.get_Item(iCtr1);
        // Add a child tree node for each Order object.
        int countIndex = 0;
        TreeNode myTreeNodeArray[] =
            new TreeNode[myCustomer.customerOrders.get_Count()];
        for (int iCtr2 = 0; iCtr2 < myCustomer.customerOrders.get_Count();
            iCtr2++) {
            Order myOrder = (Order)myCustomer.customerOrders.get_Item(iCtr2);
            // Add the Order tree node to the array.
            myTreeNodeArray.set_Item(countIndex,
                new TreeNode(myOrder.orderID, unselectedOrderImageIndex,
                selectedOrderImageIndex));
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.customerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex,
            myTreeNodeArray);
        myTreeView.get_Nodes().get_Item(0).get_Nodes().Add(customerNode);
    }
} //FillTreeView

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

TreeView-Klasse
TreeView-Member
System.Windows.Forms-Namespace