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.net3.0中跨线程访问控件2011-12-21 cnblogs 周银辉这两天用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 onprivate 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);    }  }}