简单介绍.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);

}

}

}

转载自:http://www.aspnetjia.com/Cont-172.html