Visual.GetVisualChild(Int32) Visual.GetVisualChild(Int32) Visual.GetVisualChild(Int32) Visual.GetVisualChild(Int32) Method

定义

返回父级 Visual 中的指定 VisualCollectionReturns the specified Visual in the parent VisualCollection.

protected:
 virtual System::Windows::Media::Visual ^ GetVisualChild(int index);
protected virtual System.Windows.Media.Visual GetVisualChild (int index);
abstract member GetVisualChild : int -> System.Windows.Media.Visual
override this.GetVisualChild : int -> System.Windows.Media.Visual
Protected Overridable Function GetVisualChild (index As Integer) As Visual

参数

index
Int32 Int32 Int32 Int32

VisualCollection 中的可视对象的索引。The index of the visual object in the VisualCollection.

返回

VisualCollection 中指定 index 值处的子级。The child in the VisualCollection at the specified index value.

示例

下面的示例定义的GetVisualChild重写实现。The following example defines an overridden implementation of GetVisualChild.

// Provide a required override for the GetVisualChild method.
protected override Visual GetVisualChild(int index)
{
    if (index < 0 || index >= _children.Count)
    {
        throw new ArgumentOutOfRangeException();
    }

    return _children[index];
}
' Provide a required override for the GetVisualChild method.
Protected Overrides Function GetVisualChild(ByVal index As Integer) As Visual
	If index < 0 OrElse index >= _children.Count Then
		Throw New ArgumentOutOfRangeException()
	End If

	Return _children(index)
End Function

注解

默认情况下, Visual没有任何子级。By default, a Visual has no children. 因此, 默认实现始终引发ArgumentOutOfRangeExceptionTherefore, the default implementation always throws an ArgumentOutOfRangeException.

继承者说明

Visual派生的类必须重写此方法和VisualChildrenCount属性, 以便正确枚举可视化树。A class that derives from Visual must override this method, and also the VisualChildrenCount property, for the visual tree to be enumerated correctly.

适用于