UIElementCollection.IndexOf(UIElement) UIElementCollection.IndexOf(UIElement) UIElementCollection.IndexOf(UIElement) UIElementCollection.IndexOf(UIElement) Method

Definición

Devuelve la posición de índice de un elemento especificado en UIElementCollection.Returns the index position of a specified element in a UIElementCollection.

public:
 virtual int IndexOf(System::Windows::UIElement ^ element);
public virtual int IndexOf (System.Windows.UIElement element);
abstract member IndexOf : System.Windows.UIElement -> int
override this.IndexOf : System.Windows.UIElement -> int
Public Overridable Function IndexOf (element As UIElement) As Integer

Parámetros

element
UIElement UIElement UIElement UIElement

Elemento cuya posición de índice se requiere.The element whose index position is required.

Devoluciones

Posición de índice del elemento.The index position of the element. Devuelve -1 si el elemento no está en la colección.-1 if the element is not in the collection.

Ejemplos

El ejemplo siguiente busca la posición de índice de un UIElement dentro de un UIElementCollection.The following example finds the index position of a UIElement within a UIElementCollection.

<DockPanel Name="ParentElement">

    <TextBlock DockPanel.Dock="Top" Name="TxtDisplay"></TextBlock>

    <Button DockPanel.Dock="Top" Click="FindIndex">What is the Index Number
        of the Element Just Added?</Button>
    <DockPanel Name="MainDisplayPanel">
        <TextBlock DockPanel.Dock="Top">Text 1</TextBlock>
        <TextBlock DockPanel.Dock="Top">Text 2</TextBlock>
    </DockPanel>
</DockPanel>

......

private int c_counter = 0;
void FindIndex(object sender, RoutedEventArgs e)
{
	c_counter+=1;
	// Create a new Text element.
	TextBlock newText = new TextBlock();
	// Add this element to the UIElementCollection of the DockPanel element.
	MainDisplayPanel.Children.Add(newText);
	// Add a text node under the Text element. This text is displayed. 
	newText.Text = "New element #" + c_counter;
	DockPanel.SetDock(newText,Dock.Top);
	// Display the Index number of the new element.    
	TxtDisplay.Text = "The Index of the new element is " +  MainDisplayPanel.Children.IndexOf(newText);
}
Dim c_counter as Integer = 0
   Private Sub FindIndex(ByVal sender As Object, ByVal args As RoutedEventArgs)
       Try
           Dim newText As TextBlock = New TextBlock()
           c_counter = c_counter + 1
           ' Add this element to the UIElementCollection of the DockPanel element.
           MainDisplayPanel.Children.Add(newText)
           ' Add a text node under the Text element. This text is displayed. 
           newText.Text = "New element #" & CStr(c_counter)
           DockPanel.SetDock(newText, Dock.Top)
           ' Display the Index number of the new element.    
           TxtDisplay.Text = "The Index of the new element is " & MainDisplayPanel.Children.IndexOf(newText)
       Catch ex As System.Exception
           System.Windows.MessageBox.Show(ex.Message)
       End Try
   End Sub

Se aplica a