Wp7客户端与Webservice的数据传输，json的序列化与反序列化

首先是一个json序列化与反序列化的的帮助类（不记得是看博客园哪个大神的了。。）：

public class JsonHelper
    {    
        public static string JsonSerializer<T>(T t)  
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }
        public static T JsonDeserialize<T>(string jsonString)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        }
    }

一个实体类：

public class WeatherInfo
    {
        public string CityName { get; set; }
        public string Date { get; set; }
    }

服务端代码：

[WebMethod(Description = "返回信息")]
        public string getJson(String city)
        {
            WeatherInfo weather = new WeatherInfo();
            weather.CityName = city;
            weather.Date = Date.Now.ToString();
            string jsonString = JsonHelper.JsonSerializer<WeatherInfo>(weather);
            return jsonString;
        }

客户端代码：

public void GetForecast(string city)
        {
            WebClient client = new WebClient();
            client.OpenReadAsync(new Uri("http://localhost/Weather.asmx/getJson?city=" + city
                + "&time=" + DateTime.Now.ToString("yyyyMMddHHmmss"),UriKind.RelativeOrAbsolute));
            client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
        }

void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            try
            {
                XElement xmlWeather;
                xmlWeather = XElement.Load(e.Result);
                WeatherInfo weatherInfo = new WeatherInfo();

                weatherInfo = JsonHelper.JsonDeserialize<WeatherInfo>(xmlWeather.Value);

               
                //Debug.WriteLine(weatherInfo.CityName);

            }
            catch (Exception)
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    MessageBox.Show("数据获取出错。");
                });
            }
        }

这样就实现了webservice相应wp7app请求并返回数据的过程。