Silverlight方法内的异步操作-返回值

调用异步框架组件的正确方法是什么?等待答案,然后返回值。aka以单个方法包含整个请求/响应。

示例代码:

    public class Experiment
    {
     public Experiment()
     {

     }
        public string GetSomeString()
        {
            WebClient wc = new WebClient();
            wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
            Uri u = new Uri("http://news.google.com/news?pz=1&cf=all&ned=us&hl=en&topic=t&output=rss");
            wc.DownloadStringAsync(u);
            return "the news RSS from Google";
        }

        private void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {

            //don't really see how this callback method makes it able
            // to return the answer I'm looking for on the return
            // statement in the method above.
        }
    }

更多信息 以下内容: 我之所以问这个问题,是因为我有一个我正在研究的项目,我希望浏览器中的javascript代码可以像Web服务和复杂计算和操作的外观/代理那样使用Silverlight。我想同步给西尔维莱特的[脚本成员]打电话。我不希望Silverlight回调到浏览器的javascript中