分享一篇基于.NET的微信SDK

特别不喜欢麻烦的一个人，最近碰到了微信开发。下载下来了一些其他人写的微信开发“框架”，但是被恶心到了，实现的太臃肿啦。

最不喜欢的就是把微信返回的xml消息在组装成实体类，所以会比较臃肿，现在都提倡轻量级，所以有什么办法可以避免大量实体类的存在呢。

当然，还有包装的比较繁杂，看完官方API后，再看"框架"，让人感觉一头雾水，不够清晰、明了。

二、我的实现思路

我的微信SDK（不敢自称框架），最重要的实现2个目标：

1.轻量级，就是要摒弃实体类，尽量少的申明Entity，减少SDK的体量；

2.简单、明了，就是SDK类的划分和官方API保持一致，让人一看就懂你的用意。

用户发送请是首先POST到微信服务器的，然后微信服务器在POST到我的服务器，这个接受的消息是xml,我猜测为什么是xml,而不是更轻量级的json，是为了更好的兼容性，毕竟xml更通用一些（说错了，请指出来）。而我们主动调用微信的一些API时，它返回的是json格式，我靠，要死啊，高大上啊。你们的副总裁张小龙不知道这事吗？好吧，这样其实也可以的。

其实，调用微信的工作原理很简单，没有必要上来就框架什么的，我相信是个合格的程序员都能做出来。

我们的服务器只需要一个GET,和一个POST就可以和微信通信了，从这一点来看，设计的还是比较人性化的，赞一个。GET用于接通微信服务的校验，验证；POST用于接收微信服务器过来的消息，然后将Response组装好返回即可。

三、上代码

好了，废话不多说了。

由于微信服务器Post给我们的是xml消息，返回的是json,所以需要互转。这样就存在3种类型的format,这也是大量的框架定义实体类导致框架不够轻量级的的原因之所在。

实现第一个目标，我主要用到了.net Framework4.0的Dynamic特性，和一个将xml字符串自动转换成Dynamic Object的DynamicXml.cs类，还有一个将json字符串自动转换成Dynamic Object的DynamicJson.cs类。

苦苦寻觅，终于让我找到了我想要的。

1.以下是DynamicXml.cs类，文件头有原作者的版权信息。

/*--------------------------------------------------------------------------   * https://www.captechconsulting.com/blog/kevin-hazzard/fluent-xml-parsing-using-cs-dynamic-type-part-1   * 博客园网友 夜の魔王 友情借用此代码，用于微信开发。   * http://www.cnblogs.com/deepleo/*--------------------------------------------------------------------------*/using System;using System.Collections.Generic;using System.Linq;using System.Dynamic;using System.Xml.Linq;using System.Collections;public class DynamicXml : DynamicObject, IEnumerable  {    private readonly List<XElement> _elements;    public DynamicXml(string text)      {        var doc = XDocument.Parse(text);          _elements = new List<XElement> { doc.Root };      }    protected DynamicXml(XElement element)      {          _elements = new List<XElement> { element };      }    protected DynamicXml(IEnumerable<XElement> elements)      {          _elements = new List<XElement>(elements);      }    public override bool TryGetMember(GetMemberBinder binder, out object result)      {          result = null;        if (binder.Name == "Value")              result = _elements[0].Value;        else if (binder.Name == "Count")              result = _elements.Count;        else          {            var attr = _elements[0].Attribute(XName.Get(binder.Name));            if (attr != null)                  result = attr;            else              {                var items = _elements.Descendants(XName.Get(binder.Name));                if (items == null || items.Count() == 0) return false;                  result = new DynamicXml(items);              }          }        return true;      }    public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)      {        int ndx = (int)indexes[0];          result = new DynamicXml(_elements[ndx]);        return true;      }    public IEnumerator GetEnumerator()      {        foreach (var element in _elements)            yield return new DynamicXml(element);      }  }

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这个代码我也没仔细看，反正能用，没出过差错。

2.以下是DynamicJson.cs类，文件头有原作者的版权信息

/*--------------------------------------------------------------------------  * DynamicJson  * ver 1.2.0.0 (May. 21th, 2010)  *  * created and maintained by neuecc <ils@neue.cc>  * licensed under Microsoft Public License(Ms-PL)  * http://neue.cc/* http://dynamicjson.codeplex.com/   * 博客园网友 夜の魔王 友情借用此代码，用于微信开发。   * http://www.cnblogs.com/deepleo/*--------------------------------------------------------------------------*/using System;using System.Collections;using System.Collections.Generic;using System.Diagnostics;using System.Dynamic;using System.IO;using System.Linq;using System.Reflection;using System.Runtime.Serialization.Json;using System.Text;using System.Xml;using System.Xml.Linq;namespace Codeplex.Data  {    public class DynamicJson : DynamicObject      {        private enum JsonType          {              @string, number, boolean, @object, array, @null          }        // public static methods            /// <summary>from JsonSring to DynamicJson</summary>          public static dynamic Parse(string json)          {            return Parse(json, Encoding.Unicode);          }        /// <summary>from JsonSring to DynamicJson</summary>          public static dynamic Parse(string json, Encoding encoding)          {            using (var reader = JsonReaderWriterFactory.CreateJsonReader(encoding.GetBytes(json), XmlDictionaryReaderQuotas.Max))              {                return ToValue(XElement.Load(reader));              }          }        /// <summary>from JsonSringStream to DynamicJson</summary>          public static dynamic Parse(Stream stream)          {            using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, XmlDictionaryReaderQuotas.Max))              {                return ToValue(XElement.Load(reader));              }          }        /// <summary>from JsonSringStream to DynamicJson</summary>          public static dynamic Parse(Stream stream, Encoding encoding)          {            using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, encoding, XmlDictionaryReaderQuotas.Max, _ => { }))              {                return ToValue(XElement.Load(reader));              }          }        /// <summary>create JsonSring from primitive or IEnumerable or Object({public property name:property value})</summary>          public static string Serialize(object obj)          {            return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(GetJsonType(obj)), CreateJsonNode(obj)));          }        // private static methods            private static dynamic ToValue(XElement element)          {            var type = (JsonType)Enum.Parse(typeof(JsonType), element.Attribute("type").Value);            switch (type)              {                case JsonType.boolean:                    return (bool)element;                case JsonType.number:                    return (double)element;                case JsonType.@string:                    return (string)element;                case JsonType.@object:                case JsonType.array:                    return new DynamicJson(element, type);                case JsonType.@null:                default:                    return null;              }          }        private static JsonType GetJsonType(object obj)          {            if (obj == null) return JsonType.@null;            switch (Type.GetTypeCode(obj.GetType()))              {                case TypeCode.Boolean:                    return JsonType.boolean;                case TypeCode.String:                case TypeCode.Char:                case TypeCode.DateTime:                    return JsonType.@string;                case TypeCode.Int16:                case TypeCode.Int32:                case TypeCode.Int64:                case TypeCode.UInt16:                case TypeCode.UInt32:                case TypeCode.UInt64:                case TypeCode.Single:                case TypeCode.Double:                case TypeCode.Decimal:                case TypeCode.SByte:                case TypeCode.Byte:                    return JsonType.number;                case TypeCode.Object:                    return (obj is IEnumerable) ? JsonType.array : JsonType.@object;                case TypeCode.DBNull:                case TypeCode.Empty:                default:                    return JsonType.@null;              }          }        private static XAttribute CreateTypeAttr(JsonType type)          {            return new XAttribute("type", type.ToString());          }        private static object CreateJsonNode(object obj)          {            var type = GetJsonType(obj);            switch (type)              {                case JsonType.@string:                case JsonType.number:                    return obj;                case JsonType.boolean:                    return obj.ToString().ToLower();                case JsonType.@object:                    return CreateXObject(obj);                case JsonType.array:                    return CreateXArray(obj as IEnumerable);                case JsonType.@null:                default:                    return null;              }          }        private static IEnumerable<XStreamingElement> CreateXArray<T>(T obj) where T : IEnumerable          {            return obj.Cast<object>()                  .Select(o => new XStreamingElement("item", CreateTypeAttr(GetJsonType(o)), CreateJsonNode(o)));          }        private static IEnumerable<XStreamingElement> CreateXObject(object obj)          {            return obj.GetType()                  .GetProperties(BindingFlags.Public | BindingFlags.Instance)                  .Select(pi => new { Name = pi.Name, Value = pi.GetValue(obj, null) })                  .Select(a => new XStreamingElement(a.Name, CreateTypeAttr(GetJsonType(a.Value)), CreateJsonNode(a.Value)));          }        private static string CreateJsonString(XStreamingElement element)          {            using (var ms = new MemoryStream())            using (var writer = JsonReaderWriterFactory.CreateJsonWriter(ms, Encoding.Unicode))              {                  element.WriteTo(writer);                  writer.Flush();                return Encoding.Unicode.GetString(ms.ToArray());              }          }        // dynamic structure represents JavaScript Object/Array            readonly XElement xml;        readonly JsonType jsonType;        /// <summary>create blank JSObject</summary>          public DynamicJson()          {              xml = new XElement("root", CreateTypeAttr(JsonType.@object));              jsonType = JsonType.@object;          }        private DynamicJson(XElement element, JsonType type)          {              Debug.Assert(type == JsonType.array || type == JsonType.@object);                xml = element;              jsonType = type;          }        public bool IsObject { get { return jsonType == JsonType.@object; } }        public bool IsArray { get { return jsonType == JsonType.array; } }        /// <summary>has property or not</summary>          public bool IsDefined(string name)          {            return IsObject && (xml.Element(name) != null);          }        /// <summary>has property or not</summary>          public bool IsDefined(int index)          {            return IsArray && (xml.Elements().ElementAtOrDefault(index) != null);          }        /// <summary>delete property</summary>          public bool Delete(string name)          {            var elem = xml.Element(name);            if (elem != null)              {                  elem.Remove();                return true;              }            else return false;          }        /// <summary>delete property</summary>          public bool Delete(int index)          {            var elem = xml.Elements().ElementAtOrDefault(index);            if (elem != null)              {                  elem.Remove();                return true;              }            else return false;          }        /// <summary>mapping to Array or Class by Public PropertyName</summary>          public T Deserialize<T>()          {            return (T)Deserialize(typeof(T));          }        private object Deserialize(Type type)          {            return (IsArray) ? DeserializeArray(type) : DeserializeObject(type);          }        private dynamic DeserializeValue(XElement element, Type elementType)          {            var value = ToValue(element);            if (value is DynamicJson)              {                  value = ((DynamicJson)value).Deserialize(elementType);              }            return Convert.ChangeType(value, elementType);          }        private object DeserializeObject(Type targetType)          {            var result = Activator.CreateInstance(targetType);            var dict = targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance)                  .Where(p => p.CanWrite)                  .ToDictionary(pi => pi.Name, pi => pi);            foreach (var item in xml.Elements())              {                  PropertyInfo propertyInfo;                if (!dict.TryGetValue(item.Name.LocalName, out propertyInfo)) continue;                var value = DeserializeValue(item, propertyInfo.PropertyType);                  propertyInfo.SetValue(result, value, null);              }            return result;          }        private object DeserializeArray(Type targetType)          {            if (targetType.IsArray) // Foo[]            {                var elemType = targetType.GetElementType();                  dynamic array = Array.CreateInstance(elemType, xml.Elements().Count());                var index = 0;                foreach (var item in xml.Elements())                  {                      array[index++] = DeserializeValue(item, elemType);                  }                return array;              }            else // List<Foo>            {                var elemType = targetType.GetGenericArguments()[0];                  dynamic list = Activator.CreateInstance(targetType);                foreach (var item in xml.Elements())                  {                      list.Add(DeserializeValue(item, elemType));                  }                return list;              }          }        // Delete          public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)          {              result = (IsArray)                ? Delete((int)args[0])                  : Delete((string)args[0]);            return true;          }        // IsDefined, if has args then TryGetMember          public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)          {            if (args.Length > 0)              {                  result = null;                return false;              }                result = IsDefined(binder.Name);            return true;          }        // Deserialize or foreach(IEnumerable)          public override bool TryConvert(ConvertBinder binder, out object result)          {            if (binder.Type == typeof(IEnumerable) || binder.Type == typeof(object[]))              {                var ie = (IsArray)                    ? xml.Elements().Select(x => ToValue(x))                      : xml.Elements().Select(x => (dynamic)new KeyValuePair<string, object>(x.Name.LocalName, ToValue(x)));                  result = (binder.Type == typeof(object[])) ? ie.ToArray() : ie;              }            else              {                  result = Deserialize(binder.Type);              }            return true;          }        private bool TryGet(XElement element, out object result)          {            if (element == null)              {                  result = null;                return false;              }                result = ToValue(element);            return true;          }        public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)          {            return (IsArray)                ? TryGet(xml.Elements().ElementAtOrDefault((int)indexes[0]), out result)                  : TryGet(xml.Element((string)indexes[0]), out result);          }        public override bool TryGetMember(GetMemberBinder binder, out object result)          {            return (IsArray)                ? TryGet(xml.Elements().ElementAtOrDefault(int.Parse(binder.Name)), out result)                  : TryGet(xml.Element(binder.Name), out result);          }        private bool TrySet(string name, object value)          {            var type = GetJsonType(value);            var element = xml.Element(name);            if (element == null)              {                  xml.Add(new XElement(name, CreateTypeAttr(type), CreateJsonNode(value)));              }            else              {                  element.Attribute("type").Value = type.ToString();                  element.ReplaceNodes(CreateJsonNode(value));              }            return true;          }        private bool TrySet(int index, object value)          {            var type = GetJsonType(value);            var e = xml.Elements().ElementAtOrDefault(index);            if (e == null)              {                  xml.Add(new XElement("item", CreateTypeAttr(type), CreateJsonNode(value)));              }            else              {                  e.Attribute("type").Value = type.ToString();                  e.ReplaceNodes(CreateJsonNode(value));              }            return true;          }        public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)          {            return (IsArray)                ? TrySet((int)indexes[0], value)                  : TrySet((string)indexes[0], value);          }        public override bool TrySetMember(SetMemberBinder binder, object value)          {            return (IsArray)                ? TrySet(int.Parse(binder.Name), value)                  : TrySet(binder.Name, value);          }        public override IEnumerable<string> GetDynamicMemberNames()          {            return (IsArray)                ? xml.Elements().Select((x, i) => i.ToString())                  : xml.Elements().Select(x => x.Name.LocalName);          }        /// <summary>Serialize to JsonString</summary>          public override string ToString()          {            // <foo type="null"></foo> is can't serialize. replace to <foo type="null" />              foreach (var elem in xml.Descendants().Where(x => x.Attribute("type").Value == "null"))              {                  elem.RemoveNodes();              }            return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(jsonType), xml.Elements()));          }      }  }

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这个代码我也依旧没仔细看，反正也能用，没出过差错。

这个最核心的拦路虎解决了，后面的事情就顺理成章的进行啦。

3.基础支持API包装

/*--------------------------------------------------------------------------  * BasicAPI.cs   *Auth:deepleo  * Date:2013.12.31  * Email:2586662969@qq.com  *--------------------------------------------------------------------------*/using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Http;using Codeplex.Data;using System.IO;namespace Deepleo.Weixin.SDK  {    /// <summary>      /// 对应微信API的 "基础支持"    /// </summary>      public class BasicAPI      {        /// <summary>          /// 检查签名是否正确:        /// http://mp.weixin.qq.com/wiki/index.php?title=%E6%8E%A5%E5%85%A5%E6%8C%87%E5%8D%97          /// </summary>          /// <param name="signature"></param>          /// <param name="timestamp"></param>          /// <param name="nonce"></param>          /// <param name="token">AccessToken</param>          /// <returns>          /// true: check signature success        /// false: check failed, 非微信官方调用!        /// </returns>          public static bool CheckSignature(string signature, string timestamp, string nonce, string token, out string ent)          {            var arr = new[] { token, timestamp, nonce }.OrderBy(z => z).ToArray();            var arrString = string.Join("", arr);            var sha1 = System.Security.Cryptography.SHA1.Create();            var sha1Arr = sha1.ComputeHash(Encoding.UTF8.GetBytes(arrString));              StringBuilder enText = new StringBuilder();            foreach (var b in sha1Arr)              {                  enText.AppendFormat("{0:x2}", b);              }              ent = enText.ToString();            return signature == enText.ToString();          }        /// <summary>          /// 获取AccessToken        /// http://mp.weixin.qq.com/wiki/index.php?title=%E8%8E%B7%E5%8F%96access_token          /// </summary>          /// <param name="grant_type"></param>          /// <param name="appid"></param>          /// <param name="secrect"></param>          /// <returns>access_toke</returns>          public static dynamic GetAccessToken( string appid, string secrect)          {            var url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type={0}&appid={1}&secret={2}", "client_credential", appid, secrect);            var client = new HttpClient();            var result = client.GetAsync(url).Result;            if (!result.IsSuccessStatusCode) return string.Empty;            var token = DynamicJson.Parse(result.Content.ReadAsStringAsync().Result);            return token;          }        /// <summary>          /// 上传多媒体文件        /// http://mp.weixin.qq.com/wiki/index.php?title=%E4%B8%8A%E4%BC%A0%E4%B8%8B%E8%BD%BD%E5%A4%9A%E5%AA%92%E4%BD%93%E6%96%87%E4%BB%B6          /// 1.上传的媒体文件限制：        ///图片（image) : 1MB，支持JPG格式        ///语音（voice）：1MB，播放长度不超过60s，支持MP4格式        ///视频（video）：10MB，支持MP4格式        ///缩略图（thumb)：64KB，支持JPG格式        ///2.媒体文件在后台保存时间为3天，即3天后media_id失效        /// </summary>          /// <param name="token"></param>          /// <param name="type"></param>          /// <param name="file"></param>          /// <returns>media_id</returns>          public static string UploadMedia(string token, string type, string file)          {            var url = string.Format("http://api.weixin.qq.com/cgi-bin/media/upload?access_token={0}&type={1}&filename={2}", token, type, Path.GetFileName(file));            var client = new HttpClient();            var result = client.PostAsync(url, new StreamContent(new FileStream(file, FileMode.Open, FileAccess.Read)));            if (!result.Result.IsSuccessStatusCode) return string.Empty;            var media = DynamicJson.Parse(result.Result.Content.ReadAsStringAsync().Result);            return media.media_id;          }      }  }

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4.发送消息包装

/*--------------------------------------------------------------------------  * SendMessageAPI.cs   *Auth:deepleo  * Date:2013.12.31  * Email:2586662969@qq.com  *--------------------------------------------------------------------------*/using System;using System.Collections.Generic;using System.Linq;using System.Text;using Codeplex.Data;using System.Net;using System.Net.Http;namespace Deepleo.Weixin.SDK  {    /// <summary>      /// 对应微信API的 "发送消息”    /// </summary>      public class SendMessageAPI      {        /// <summary>          /// 被动回复消息        /// </summary>          /// <param name="message">微信服务器推送的消息</param>          /// <param name="executor">用户自定义的消息执行者</param>          /// <returns></returns>          public static string Relay(WeixinMessage message, IWeixinExecutor executor)          {            return executor.Execute(message);          }        /// <summary>          /// 主动发送客服消息        /// http://mp.weixin.qq.com/wiki/index.php?title=%E5%8F%91%E9%80%81%E5%AE%A2%E6%9C%8D%E6%B6%88%E6%81%AF          /// 当用户主动发消息给公众号的时候        /// 开发者在一段时间内（目前为24小时）可以调用客服消息接口，在24小时内不限制发送次数。        /// </summary>          /// <param name="token"></param>          /// <param name="msg">json格式的消息，具体格式请参考微信官方API</param>          /// <returns></returns>          public static bool Send(string token, string msg)          {            var client = new HttpClient();            var task = client.PostAsync(string.Format("https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token={0}", token), new StringContent(msg)).Result;            return task.IsSuccessStatusCode;          }      }  }

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5.其他代码就不一一贴出来了。可以在文章最后自行下载完整代码查阅。

6.处理与微信服务器通信的WeixinController.cs,WeixinExecutor.cs

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Web;using System.Web.Mvc;using System.Xml.Linq;using Deepleo.Weixin.SDK;using Deepleo.NewTon.Web.Services;using System.Xml;using Deepleo.NewTon.Framework.Services.Admin;using Deepleo.Log;namespace Deepleo.NewTon.Web.Controllers  {    public class WeixinController : Controller      {        public WeixinController()          {          }        /// <summary>          /// 微信后台验证地址（使用Get），微信后台的“接口配置信息”的Url        /// </summary>        [HttpGet]          [ActionName("Index")]        public ActionResult Get(string signature, string timestamp, string nonce, string echostr)          {            var token = new SettingsService().Get().Token;            if (string.IsNullOrEmpty(_token)) return Content("请先设置Token！");            var ent = "";            if (!BasicAPI.CheckSignature(signature, timestamp, nonce, _token, out ent))              {                new WeixinLogService().Create(new Framework.Entities.WeixinLog("get(failed)", string.Format("(get weixin)signature:{0},timestamp:{1},nonce:{2},echostr:{3},ent:{4},token:{5}",                      signature, timestamp, nonce, echostr, ent, _token)));                return Content("参数错误！");              }                      return Content(echostr); //返回随机字符串则表示验证通过        }        /// <summary>          /// 用户发送消息后，微信平台自动Post一个请求到这里，并等待响应XML。        /// </summary>        [HttpPost]          [ActionName("Index")]        public ActionResult Post(string signature, string timestamp, string nonce, string echostr)          {                               WeixinMessage message = null;                using (var streamReader = new StreamReader(Request.InputStream))                  {                      message = AcceptMessageAPI.Parse(streamReader.ReadToEnd());                  }              var  response = new WeixinExecutor().Execute(message);            return new ContentResult              {                  Content = response,                  ContentType = "text/xml",                  ContentEncoding = System.Text.UTF8Encoding.UTF8              };          }        }  }

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/*--------------------------------------------------------------------------  * WeixinExecutor.cs   *Auth:deepleo  * Date:2013.12.31  * Email:2586662969@qq.com  *--------------------------------------------------------------------------*/using System;using System.Collections.Generic;using System.Linq;using System.Web;using Deepleo.Weixin.SDK;using System.Text;using System.Text.RegularExpressions;namespace Deepleo.Weixin  {    public class WeixinExecutor : IWeixinExecutor      {        public WeixinExecutor()          {          }        public string Execute(WeixinMessage message)          {            var result = "";            string openId = message.Body.FromUserName.Value;            var myUserName = message.Body.ToUserName.Value;            switch (message.Type)              {                case WeixinMessageType.Text:                    string userMessage = message.Body.Content.Value;                      result = RepayText(openId, myUserName, "欢迎使用");                    break;                case WeixinMessageType.Event:                    string eventType = message.Body.Event.Value.ToLower();                    string eventKey = message.Body.EventKey.Value;                    switch (eventType)                      {                        case "subscribe":                              result = RepayText(openId, myUserName, "欢迎订阅");                            break;                        case "unsubscribe":                              result = RepayText(openId, myUserName, "欢迎再来");                            break;                        case "scan":                              result = RepayText(openId, myUserName, "欢迎使用");                            break;                        case "location"://用户进入应用时记录用户地理位置                              #region location                            var lat = message.Body.Latitude.Value.ToString();                            var lng = message.Body.Longitude.Value.ToString();                            var pcn = message.Body.Precision.Value.ToString();                            #endregion                              break;                        case "click":                            switch (eventKey)//refer to： Recources/menu.json                            {                                case "myaccount":                                    #region 我的账户                                      result = RepayText(openId, myUserName, "我的账户.");                                    #endregion                                      break;                                default:                                      result = string.Format("<xml><ToUserName><![CDATA[{0}]]></ToUserName>" +                                         "<FromUserName><![CDATA[{1}]]></FromUserName>" +                                         "<CreateTime>{2}</CreateTime>" +                                         "<MsgType><![CDATA[text]]></MsgType>" +                                         "<Content><![CDATA[{3}]]></Content>" + "</xml>",                                           openId, myUserName, DateTime.Now.ToBinary(), "没有响应菜单事件");                                    break;                              }                            break;                      }                    break;                default:                      result = string.Format("<xml><ToUserName><![CDATA[{0}]]></ToUserName>" +                                         "<FromUserName><![CDATA[{1}]]></FromUserName>" +                                         "<CreateTime>{2}</CreateTime>" +                                         "<MsgType><![CDATA[text]]></MsgType>" +                                         "<Content><![CDATA[{3}]]></Content>" + "</xml>",                                           openId, myUserName, DateTime.Now.ToBinary(), string.Format("未处理消息类型:{0}", message.Type));                    break;              }            return result;          }        private string RepayText(string toUserName, string fromUserName, string content)          {            return string.Format("<xml><ToUserName><![CDATA[{0}]]></ToUserName>" +                                                   "<FromUserName><![CDATA[{1}]]></FromUserName>" +                                                   "<CreateTime>{2}</CreateTime>" +                                                   "<MsgType><![CDATA[text]]></MsgType>" +                                                   "<Content><![CDATA[{3}]]></Content>" + "</xml>",                                                     toUserName, fromUserName, DateTime.Now.ToBinary(), content);          }        private string RepayNews(string toUserName, string fromUserName, List<WeixinNews> news)          {            var couponesBuilder = new StringBuilder();              couponesBuilder.Append(string.Format("<xml><ToUserName><![CDATA[{0}]]></ToUserName>" +            "<FromUserName><![CDATA[{1}]]></FromUserName>" +            "<CreateTime>{2}</CreateTime>" +            "<MsgType><![CDATA[news]]></MsgType>" +            "<ArticleCount>{3}</ArticleCount><Articles>",               toUserName, fromUserName,               DateTime.Now.ToBinary(),               news.Count                  ));            foreach (var c in news)              {                  couponesBuilder.Append(string.Format("<item><Title><![CDATA[{0}]]></Title>" +                    "<Description><![CDATA[{1}]]></Description>" +                    "<PicUrl><![CDATA[{2}]]></PicUrl>" +                    "<Url><![CDATA[{3}]]></Url>" +                    "</item>",                     c.Title, c.Description, c.PicUrl, c.Url                   ));              }              couponesBuilder.Append("</Articles></xml>");            return couponesBuilder.ToString();          }        }    public class WeixinNews      {        public string Title { set; get; }        public string Description { set; get; }        public string PicUrl { set; get; }        public string Url { set; get; }      }  }

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