这两天用WPF做一个项目的UI部分时,发现跨线程地访问了UI控件,自然地报异常了。当时找了半天也没在控件中找到InvokeRequired属性和Invoke方法,郁闷之极.....最后发现在.net3.0中,这有所改变了。
替代InvokeRequired的方法是DispatcherObject.CheckAccess()或DispatcherObject.VerifyAccess()方法,用于指示当前线程是否可以直接访问控件。
替代Invoke的方法是DispatcherObject.Dispatcher.BeginInvoke(...)方法。
参考代码:
// Uses the DispatcherObject.CheckAccess method to determine if // the calling thread has access to the thread the UI object is on private void TryToUpdateButtonCheckAccess(object uiObject) { Button theButton = uiObject as Button; if (theButton != null) { // Checking if this thread has access to the object if(theButton.CheckAccess()) { // This thread has access so it can update the UI thread UpdateButtonUI(theButton); } else { // This thread does not have access to the UI thread // Pushing update method on the Dispatcher of the UI thread theButton.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new UpdateUIDelegate(UpdateButtonUI), theButton); } } }
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