RESTful service

1. change interface, add WebGet

[OperationContract]
        [WebGet(UriTemplate = "l/{lower}/u/{upper}", ResponseFormat = WebMessageFormat.Json)]
        int SecretNumber(string lower, string upper);

 [OperationContract]
        [WebGet(UriTemplate = "sn?l={lower}&u={upper}", ResponseFormat = WebMessageFormat.Json)]
        int SecretNumber(int lower, int upper);

2. add to svc markup

<%@ ServiceHost Language="C#" Debug="true" Service="Restful_service.Service1" CodeBehind="Service1.svc.cs" 
    Factory="System.ServiceModel.Activation.WebServiceHostFactory"
    %>

 3. 为了能让silverlight程序调用restful service 必须添加crossdomain.xml在service project的根目录

<cross-domain-policy>
  <allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-policy>

 4. use restful service

(1) Sync

 private string getResponse(Uri uri)
        {
            WebClient client = new WebClient();
            byte[] response = client.DownloadData(uri);
            String respnStr = System.Text.Encoding.Default.GetString(response);
            return respnStr;
        }

(2) Async

　　　　　　　Uri uri = new Uri(full);
            client = new WebClient();
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client1_DownloadStringCompleted);
            client.DownloadStringAsync(uri);

        void client1_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                string data = e.Error.ToString();
                label1.Content = "--------has error:" + data + "************";
                label1.Content = data;
                return;
            }
            secNum = e.Result;
        }