取得 UI 自動化項目屬性
注意
本文件適用對象為 .NET Framework 開發人員,其想要使用 System.Windows.Automation 命名空間中定義的受控 UI 自動化類別。 如需 UI 自動化的最新資訊,請參閱 Windows 自動化 API:UI 自動化。
本主題說明如何擷取 UI 自動化元素的屬性。
取得目前的屬性值
取得您想要取得其屬性的 AutomationElement。
呼叫 GetCurrentPropertyValue 或擷取 Current 屬性結構,並從其中一個成員取得值。
取得快取屬性值
取得您想要取得其屬性的 AutomationElement。 此屬性必須已在 CacheRequest 中指定。
呼叫 GetCachedPropertyValue 或擷取 Cached 屬性結構,並從其中一個成員取得值。
範例
下列範例說明擷取 AutomationElement 目前屬性的各種方式。
void PropertyCallsExample(AutomationElement elementList)
{
// The following two calls are equivalent.
string name = elementList.Current.Name;
name = elementList.GetCurrentPropertyValue(AutomationElement.NameProperty) as string;
// The following shows how to ignore the default property, which
// would probably be an empty string if the property is not supported.
// Passing "false" as the second parameter is equivalent to using the overload
// that does not have this parameter.
object help = elementList.GetCurrentPropertyValue(AutomationElement.HelpTextProperty, true);
if (help == AutomationElement.NotSupported)
{
help = "No help available";
}
string helpText = (string)help;
}
Sub PropertyCallsExample(ByVal elementList As AutomationElement)
' The following two calls are equivalent.
Dim name As String = elementList.Current.Name
name = CStr(elementList.GetCurrentPropertyValue(AutomationElement.NameProperty))
' The following shows how to ignore the default property, which
' would probably be an empty string if the property is not supported.
' Passing "false" as the second parameter is equivalent to using the overload
' that does not have this parameter.
Dim help As Object = elementList.GetCurrentPropertyValue(AutomationElement.HelpTextProperty, True)
If help Is AutomationElement.NotSupported Then
help = "No help available"
End If
Dim helpText As String = CStr(help)
End Sub