silverlight+WCF入门教程

public string SayHello(string userName)
{
    return userName + "，hello world!!";
}

private void button1_Click(object sender, RoutedEventArgs e)
{
  ServiceReference1.Service1Client ws = new ServiceReference1.Service1Client();
  ws.SayHelloCompleted += new EventHandler<ServiceReference1.SayHelloCompletedEventArgs>(SayHelloCompleted);
  ws.SayHelloAsync(textbox1.Text);
}
        
void SayHelloCompleted(object sender, ServiceReference1.SayHelloCompletedEventArgs e)
{
  label1.Content = e.Result;
}