C＃异步Web服务

Question

有人能举例说明如何使用该方法开始向用户显示提示加载... 使用下面的代码我使用Completed事件放置查询，使用方法作为Begin？

service.EventosDoDiaCompleted += RecebeEventos;
service.EventosDoDiaAsync();

private void RecebeEventos(object sender, AsyncCompletedEventArgs e)
{
   Dataset ds = service.EventosDoDia();
}

Answer 1

只需放置简单的Textblock或类似的东西：

    service.EventosDoDiaCompleted += RecebeEventos;
    textblock.Text="Loading....";
    service.EventosDoDiaAsync();
    private void RecebeEventos(object sender, AsyncCompletedEventArgs e)
    {
        textblock.Text="Loaded";
        Dataset ds = service.EventosDoDia();
    }