WCF中JSON的应用

<!--[if !supportLists]-->一、<!--[endif]-->JSON

JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。它基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集。 JSON采用完全独立于语言的文本格式，但是也使用了类似于C语言家族的习惯（包括C, C++, C#, Java, JavaScript, Perl, Python等）。这些特性使JSON成为理想的数据交换语言。易于人阅读和编写，同时也易于机器解析和生成。

<!--[if !supportLists]-->二、<!--[endif]-->定义JSON

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <!--业务逻辑Id-->
    <add key="BusinessMessageList" value="[{BusinessId:'001',Ip:'10.1.20.5',Port:'6001'}]"/>
  </appSettings>
</configuration>

<!--[if !supportLists]-->三、<!--[endif]-->读取配置档JSON

    internal class ServerParameter
    {
        internal static readonly string BusinessMessageListJSON = GetAppSettings("BusinessMessageList", ""); // 业务逻辑Message服务URI列表
        internal static List<Dictionary<string, string>> BusinessMessageList = new List<Dictionary<string, string>>();
        #region GetAppSettings
        /// <summary>
        ///  获取配置Value
        /// </summary>
        /// <param name="key"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        private static string GetAppSettings(string key, string defaultValue)
        {
            if (ConfigurationManager.AppSettings[key] == null)
            {
                return defaultValue;
            }
            else
            {
                return ConfigurationManager.AppSettings[key].ToString();
            }
        }
        #endregion
    }

四、<!--[endif]-->读取JSON方法定义

    public class JSONHelper
    {
        #region From JSON
        /// <summary>
        /// JSON文本转对象,泛型方法
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="jsonText">JSON文本</param>
        /// <returns>指定类型的对象</returns>
        public static T JSONToObject<T>(string jsonText)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            try
            {
                return jss.Deserialize<T>(jsonText);
            }
            catch (Exception ex)
            {
                throw new Exception("JSONHelper.JSONToObject(): " + ex.Message);
            }
        }

        /// <summary>
        /// JSON 转List<Dictionary<string, string>>
        /// </summary>
        /// <param name="jsonText"></param>
        /// <returns></returns>
        public static List<Dictionary<string, string>> JSONToList(string jsonText)
        {
            return JSONToObject<List<Dictionary<string, string>>>(jsonText);
        }
        #endregion
    }

<!--[if !supportLists]-->五、<!--[endif]-->控制台输出JSON内容

    class Program
    {
        static void Main(string[] args)
        {
            ServerParameter.BusinessMessageList = JSON.JSONHelper.JSONToList(ServerParameter.BusinessMessageListJSON);
            // 查询BusinessId对应的URI
            string uri =GetBusinessMessageURI("001");
            Console.WriteLine(uri);
            Console.ReadLine();
        }
        /// <summary>
        /// 获取业务逻辑层Message服务的URI
        /// </summary>
        /// <param name="businessId"></param>
        /// <returns></returns>
        internal static string GetBusinessMessageURI(string businessId)
        {
            return GetBusinessURI(businessId, ServerParameter.BusinessMessageList, "BusinessMessageService");
        }
        /// <summary>
        /// 获取业务逻辑层指定服务的URI
        /// </summary>
        /// <param name="businessId"></param>
        /// <param name="businessList"></param>
        /// <param name="serviceName"></param>
        /// <returns></returns>
        internal static string GetBusinessURI(string businessId, List<Dictionary<string, string>> businessList, string serviceName)
        {
            string uri = string.Empty;
            foreach (Dictionary<string, string> dictionary in businessList)
            {
                if (dictionary["BusinessId"].ToString().Trim() == businessId.Trim())
                {
                    string ip = dictionary["Ip"].ToString().Trim();
                    string port = dictionary["Port"].ToString().Trim();
                    uri = "net.tcp://" + ip + ":" + port + "/" + serviceName;
                    break;
                }
            }
            return uri;
        }
    }

<!--[if !supportLists]-->六、<!--[endif]-->总结

在WCF的项目应用中,JSON的应用很常见,本文就是其中一种简单的应用.