UIElementCollection.IndexOf(UIElement) 메서드

정의

UIElementCollection에서 지정된 요소의 인덱스 위치를 반환합니다.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

매개 변수

element
UIElement

인덱스 위치를 가져올 요소입니다.The element whose index position is required.

반환

요소의 인덱스 위치입니다.The index position of the element. 요소가 컬렉션에 있지 않으면 -1입니다.-1 if the element is not in the collection.

예제

인덱스 위치를 검색 하는 다음 예제는 UIElement 내는 UIElementCollection합니다.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

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