QueryAccessibilityHelpEventArgs.HelpString QueryAccessibilityHelpEventArgs.HelpString QueryAccessibilityHelpEventArgs.HelpString QueryAccessibilityHelpEventArgs.HelpString Property

定义

获取或设置定义要为 AccessibleObject 获取何种帮助的字符串。Gets or sets the string defining what Help to get for the AccessibleObject.

public:
 property System::String ^ HelpString { System::String ^ get(); void set(System::String ^ value); };
public string HelpString { get; set; }
member this.HelpString : string with get, set
Public Property HelpString As String

属性值

要为辅助性对象检索的帮助。The Help to retrieve for the accessible object.

示例

下面的代码示例演示如何创建可访问感知的图表控件, AccessibleObject并使用和Control.ControlAccessibleObject类公开可访问的信息。The following code example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. 控件将两条曲线与图例一起绘制。The control plots two curves along with a legend. CreateAccessibilityInstanceChartControlAccessibleObject 派生的类在方法中用于为图表控件提供自定义的可访问信息。ControlAccessibleObjectThe ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. 因为图表图例不是实际Control的控件, 而是由图表控件绘制的, 所以它不是任何内置的可访问信息。Because the chart legend is not an actual Control-based control, but instead is drawn by the chart control, it does not any built-in accessible information. 因此, ChartControlAccessibleObjectCurveLegendAccessibleObjectGetChild重写方法以返回, 该方法表示图例的每个部分的可访问信息。Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. 当可访问感知的应用程序使用此控件时, 控件可以提供必需的可访问信息。When an accessible-aware application uses this control, the control can provide the necessary accessible information.

此示例演示如何将QueryAccessibilityHelpEventArgsQueryAccessibilityHelp与事件一起使用。This example demonstrates using the QueryAccessibilityHelpEventArgs class with the QueryAccessibilityHelp event. 有关完整的代码示例, 请参阅类概述。AccessibleObjectSee the AccessibleObject class overview for the complete code example.

protected:
   // Overridden to return the custom AccessibleObject
   // for the entire chart.
   virtual AccessibleObject^ CreateAccessibilityInstance() override
   {
      return gcnew ChartControlAccessibleObject( this );
   }
// Overridden to return the custom AccessibleObject 
// for the entire chart.
protected override AccessibleObject CreateAccessibilityInstance() 
{            
    return new ChartControlAccessibleObject(this);
}
' Overridden to return the custom AccessibleObject 
' for the entire chart.
Protected Overrides Function CreateAccessibilityInstance() As AccessibleObject
    Return New ChartControlAccessibleObject(Me)
End Function 

适用于

另请参阅