TreeView.ImageIndex TreeView.ImageIndex TreeView.ImageIndex TreeView.ImageIndex Property

Definición

Obtiene o establece el valor de índice de la lista de imágenes de la imagen predeterminada que muestran los nodos de árbol.Gets or sets the image-list index value of the default image that is displayed by the tree nodes.

public:
 property int ImageIndex { int get(); void set(int value); };
[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.NoneExcludedImageIndexConverter))]
[System.Windows.Forms.RelatedImageList("ImageList")]
[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.TreeViewImageIndexConverter))]
public int ImageIndex { get; set; }
member this.ImageIndex : int with get, set
Public Property ImageIndex As Integer

Valor de propiedad

Un índice de base cero que representa la posición de una Image en una ImageList.A zero-based index that represents the position of an Image in an ImageList. El valor predeterminado es cero.The default is zero.

Excepciones

El índice especificado es menor que 0.The specified index is less than 0.

Ejemplos

En el ejemplo de código siguiente se crea y asigna un ImageList a un TreeView control y rellena el TreeView controlar con TreeNode objetos.The following code example creates and assigns an ImageList to a TreeView control and fills the TreeView control with TreeNode objects. Los nodos de árbol se les asignan imágenes desde el ImageList que se muestra en un estado seleccionado o.The tree nodes are assigned images from the ImageList that are displayed when in a selected or unselected state. En este ejemplo requiere que haya un Form que contiene un TreeViewy un ArrayList que contiene Customer objetos que contienen cada Order objetos.This example requires that you have a Form that contains a TreeView, and an ArrayList that contains Customer objects that each contain Order objects. También se supone que el Customer y Order se definen los objetos.It is also assumed that the Customer and Order objects are defined.

ref class Customer
{
public:
   ArrayList^ CustomerOrders;
   String^ CustomerName;
   Customer( String^ myName )
   {
      CustomerName = myName;
      CustomerOrders = gcnew ArrayList;
   }

};

ref class Order
{
public:
   String^ OrderID;
   Order( String^ myOrderID )
   {
      this->OrderID = myOrderID;
   }

};

   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 );
      }
   }

public class Customer
{
   public ArrayList CustomerOrders;
   public string CustomerName;
   public Customer(string myName)
   {
      CustomerName = myName;
      CustomerOrders = new ArrayList(); 
   }
}
public class Order
{
   public string OrderID;
   public Order(string myOrderID )
   {
      this.OrderID = myOrderID;
   }
}

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);
	}
}
Public Class Customer
   Public CustomerOrders As ArrayList
   Public CustomerName As String
   
   Public Sub New(myName As String)
      CustomerName = myName
      CustomerOrders = New ArrayList()
   End Sub 'New
End Class 'Customer


Public Class Order
   Public OrderID As String
   
   Public Sub New(myOrderID As String)
      Me.OrderID = myOrderID
   End Sub 'New
End Class 'Order

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

Comentarios

El ImageIndex valor es el índice de un Image almacenados en el ImageList asignado a la ImageList propiedad.The ImageIndex value is the index of an Image stored in the ImageList assigned to the ImageList property.

El ImageKey y ImageIndex propiedades se excluyen mutuamente; si se establece, se omite el resto.The ImageKey and ImageIndex properties are mutually exclusive; if one is set, the other is ignored. Si establece ImageKey, ImageIndex se establece automáticamente en -1.If you set ImageKey, ImageIndex is automatically set to -1. Como alternativa, si establece ImageIndex, ImageKey se establece automáticamente en una cadena vacía ("").Alternatively, if you set ImageIndex, ImageKey is automatically set to an empty string ("").

Nota

Al establecer el ImageIndex propiedad en tiempo de ejecución, el TreeView se vuelve a crear el identificador (consulte Control.RecreateHandle) para actualizar la apariencia del control.When setting the ImageIndex property at run time, the TreeView handle is recreated (see Control.RecreateHandle) to update the control's appearance. Esto hace que todos los nodos de árbol contraído, con la excepción seleccionada TreeNode.This causes all tree nodes to be collapsed, with the exception of the selected TreeNode.

Se aplica a