我怎样才能得到通知与.NET UIAutomation框架时进度值发生变化？ 我没有看到在AutomationElement类这样的属性。
Answer 1:
我直接从画了这个样本MSDN文档 ，只改变属性：
AutomationPropertyChangedEventHandler propChangeHandler;
/// <summary>
/// Adds a handler for property-changed event; in particular, a change in the value
/// </summary>
/// <param name="element">The UI Automation element whose state is being monitored.</param>
public void SubscribePropertyChange(AutomationElement element)
{
Automation.AddAutomationPropertyChangedEventHandler(element,
TreeScope.Element,
propChangeHandler = new AutomationPropertyChangedEventHandler(OnPropertyChange),
ValuePattern.ValueProperty);
}
/// <summary>
/// Handler for property changes.
/// </summary>
/// <param name="src">The source whose properties changed.</param>
/// <param name="e">Event arguments.</param>
private void OnPropertyChange(object src, AutomationPropertyChangedEventArgs e)
{
AutomationElement sourceElement = src as AutomationElement;
if (e.Property == ValuePattern.ValueProperty)
{
// TODO: Do something with the new value.
// The element that raised the event can be identified by its runtime ID property.
}
else
{
// TODO: Handle other property-changed events.
}
}
public void UnsubscribePropertyChange(AutomationElement element)
{
if (propChangeHandler != null)
{
Automation.RemoveAutomationPropertyChangedEventHandler(element, propChangeHandler);
}
}
文章来源: Handling ProgressBar's Value change with UIAutomation
