Silverlight中WebClient下载资源

时间：2011-04-24 来源：chenping2008

首先新建一个Silverlight应用程序带Web的，在Web程序中放入一个txt文件，名为TextFile1.txt。内容Silverlight is very good!

然后在silverlight项目中添加一个silverlight user control名为WebClientDownResource.xaml

xaml的内容为：

</Grid>

后台的代码：

private void Down_Click(object sender, RoutedEventArgs e)

        {
            string uri = Application.Current.Host.Source.AbsoluteUri;
            int index = uri.IndexOf("/ClientBin");
            uri = uri.Substring(0, index) + "/TextFile1.txt";

            WebClient webClient = new WebClient();
            webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
            webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
            webClient.OpenReadAsync(new Uri(uri));
        }

        void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
        }
        private void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                // (Add code to display error or degrade gracefully.)
            }
            else
            {
                Stream stream = e.Result;
               StreamReader reader=new StreamReader(stream);
                this.textBlock1.Text=reader.ReadToEnd();
                reader.Close();
            }
        } 具体的关于webclient的内容可以参考《pro silverlight 4 in c#》中的第6章内容。