VisualTreeHelper.GetChild(DependencyObject, Int32) 方法

public:
 static System::Windows::DependencyObject ^ GetChild(System::Windows::DependencyObject ^ reference, int childIndex);

public static System.Windows.DependencyObject GetChild(System.Windows.DependencyObject reference, int childIndex);

static member GetChild : System.Windows.DependencyObject * int -> System.Windows.DependencyObject

Public Shared Function GetChild (reference As DependencyObject, childIndex As Integer) As DependencyObject

参数

返回

子视觉对象的索引值。

示例

以下示例演示如何枚举视觉对象的所有后代。 如果你有兴趣序列化视觉对象层次结构的所有呈现信息或正在执行分析或替代呈现，则可以使用此方法。

// Enumerate all the descendants of the visual object.
public static void EnumVisual(Visual myVisual)
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(myVisual); i++)
    {
        // Retrieve child visual at specified index value.
        Visual childVisual = (Visual)VisualTreeHelper.GetChild(myVisual, i);

        // Do processing of the child visual object.

        // Enumerate children of the child visual object.
        EnumVisual(childVisual);
    }
}

' Enumerate all the descendants of the visual object.
Public Shared Sub EnumVisual(ByVal myVisual As Visual)
    For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(myVisual) - 1
        ' Retrieve child visual at specified index value.
        Dim childVisual As Visual = CType(VisualTreeHelper.GetChild(myVisual, i), Visual)

        ' Do processing of the child visual object.

        ' Enumerate children of the child visual object.
        EnumVisual(childVisual)
    Next i
End Sub

注解

GetChildrenCount调用该方法以确定父视觉对象的子元素总数。

reference值可以表示一个或Visual一个Visual3D对象，这就是为什么通用基类型DependencyObject在此处用作参数类型的原因。