.net3.0 中跨线程访问控件

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);
        }
    }
}