我希望在我的页面中通知数据已经传输完成。我创建了对象,添加了事件处理程序,并调用了一个新的线程来异步传输数据到服务器。当数据传输完毕并从服务器接收到响应时,我回调我的事件,但是抛出了“无效的跨线程访问”异常。
为什么我的事件处理程序没有运行?
// My page (PhoneApplicationPage)
public partial class PageStart
{
private void btn_Send_Click(object sender, RoutedEventArgs e)
{
TransmitHolder holder = new TransmitHolder();
holder.onCompleted += new TransmitHolder.CompleteHandler(onCompleted);
// transmit async
new Thread(delegate() { Transmitter(holder).Start(); }).Start();
}
private void onCompleted(object sender, byte[] answer)
{
//some code
}
}
public class TransmitHolder
{
public delegate void CompleteHandler(object sender, byte[] answer);
public event CompleteHandler onCompleted;
public void Complete(byte[] answer)
{
if (onCompleted != null)
{
onCompleted(null, answer); // here throw exception `invalid cross-thread access`
}
}
}
public class Transmitter
{
private TransmitHolder holder;
public Transmitter(TransmitHolder holder)
{
this.holder = holder;
}
// send data from server
public void Start()
{
// send data using soket
NetworkManager nm = new NetworkManager();
// method Send execute Connect, Send and Recive data from server
byte[] answer = nm.Send(Encoding.UTF8.GetBytes("hello_word"));
holder.Complette(answer); // notify, send data completed
}
}
OnCompleted
方法内。 - Tudor