AccessibleObject.GetChildCount Method ()

 

Retrieves the number of children belonging to an accessible object.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

abstract GetChildCount : unit -> int
override GetChildCount : unit -> int

Return Value

Type: System.Int32

The number of children belonging to an accessible object.

Notes to Inheritors:

All objects must support this property. The default implementation returns -1. Override this method when an accessible object needs to provide custom accessible children. When you override this method, you must also override GetChild.

The following example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. The control plots two curves along with a legend. The ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. Since the chart legend is not an actual Control -based control, but instead is drawn by the chart control, it does not have any built-in accessible information. Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. When an accessible-aware application uses this control, the control can provide the necessary accessible information.

This code demonstrates shows overriding the GetChildCount method. See the AccessibleObject class overview for the complete code example.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
Return to top
Show: