这篇文章还不错，使用 .net , 对微信用户的想公众号发送的文字进行回复。比较简单，自己可以修改更复杂的回复。
微信公众号开发笔记(C#)
需求分析
根据用户在微信上发送至价值中国公众号的消息，查询与该消息相关的内容返回给用户。例如，用户发送【美国经济】后收到包含【美国经济】的内容，点击可查看全文。若没有查询到相关内容，则返回默认消息。
运行环境
.NET
准备工作
1.在微信公众平台申请开发者。2.功能页面完成后上传至自己的网站并能正常访问该URL（以下统称：目标接口）3.在微信公众平台开启开发模式。
开发流程
1.验证签名，微信服务器会发一个GET请求到目标接口，接收参数后开始验证。2.首先接收微信服务器发送的请求，然后进行处理，请求为xml格式，携带公众号、发送方微信号、消息类型，消息内容等结点。3.根据消息类型，从数据库读取相关预设内容返回，要求响应时间在5秒内，返回格式同样是xml格式。
备注
输出内容一定要使用UTF-8的编码方式，否则中文会产生乱码。如果消息中需要换行，使用\r\n来换行。支持html的a标签，但是如果是换行是紧邻关系的话可能无法识别换行。 完整代码using System;using System.IO;using System.Text;using System.Web;using System.Web.Security;using System.Xml; public class WeChat : IHttpHandler{ public void ProcessRequest(HttpContext context) { weixin wx = new weixin(); String postStr = String.Empty; if (HttpContext.Current.Request.HttpMethod.ToUpper() == “POST”) { Stream s = HttpContext.Current.Request.InputStream; Byte[] b = new Byte[s.Length]; s.Read(b, 0, (Int32)s.Length); postStr = Encoding.UTF8.GetString(b); if (!String.IsNullOrEmpty(postStr)) { wx.Handle(postStr); } } else { wx.Auth(); } } public bool IsReusable { get { return false; } }} public class weixin{ private String Token = “改写为自己的Token”; private String DefaultResponseContent = “欢迎关注价值中国\r\n价值中国是中国领先的财经商业领域社会化媒体”; public void Auth() { String echoStr = HttpContext.Current.Request.QueryString[“echoStr”]; if (CheckSignature()) { if (!String.IsNullOrEmpty(echoStr)) { HttpContext.Current.Response.Write(echoStr); HttpContext.Current.Response.End(); } } } public void Handle(String postStr) { XmlDocument doc = new XmlDocument(); doc.LoadXml(postStr); XmlElement rootElement = doc.DocumentElement; XmlNode MsgType = rootElement.SelectSingleNode(“MsgType”); RequestXML requestXML = new RequestXML(); requestXML.ToUserName = rootElement.SelectSingleNode(“ToUserName”).InnerText; requestXML.FromUserName = rootElement.SelectSingleNode(“FromUserName”).InnerText; requestXML.CreateTime = rootElement.SelectSingleNode(“CreateTime”).InnerText; requestXML.MsgType = MsgType.InnerText; if (requestXML.MsgType == “text”) { requestXML.Content = rootElement.SelectSingleNode(“Content”).InnerText; } else if (requestXML.MsgType == “location”) { requestXML.Location_X = rootElement.SelectSingleNode(“Location_X”).InnerText; requestXML.Location_Y = rootElement.SelectSingleNode(“Location_Y”).InnerText; requestXML.Scale = rootElement.SelectSingleNode(“Scale”).InnerText; requestXML.MapInfo = rootElement.SelectSingleNode(“Label”).InnerText; } else if (requestXML.MsgType == “image”) { requestXML.PicUrl = rootElement.SelectSingleNode(“PicUrl”).InnerText; } ResponseMsg(requestXML); } /// 验证微信签名 private bool CheckSignature() { String signature = HttpContext.Current.Request.QueryString[“signature”]; String timestamp = HttpContext.Current.Request.QueryString[“timestamp”]; String nonce = HttpContext.Current.Request.QueryString[“nonce”]; String[] ArrTmp = { Token, timestamp, nonce }; Array.Sort(ArrTmp); String tmpStr = String.Join(“”, ArrTmp); tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, “SHA1″); tmpStr = tmpStr.ToLower(); if (tmpStr == signature) { return true; } else { return false; } } /// <summary> /// 回复消息 /// </summary> /// <param name=”weixinXML”></param> private void ResponseMsg(RequestXML requestXML) { String responseContent = String.Empty; if (requestXML.MsgType == “text”) { responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, “从数据库读取的内容”); } HttpContext.Current.Response.ContentEncoding = Encoding.UTF8; HttpContext.Current.Response.Write(responseContent); } /// 返回格式化文本XML内容 private String FormatTextXML(String fromUserName, String toUserName, String content) { return “<xml><ToUserName><![CDATA[” + fromUserName + “]]></ToUserName><FromUserName><![CDATA[” + toUserName + “]]></FromUserName><CreateTime>” + ConvertDateTimeInt(DateTime.Now) + “</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[” + content + “]]></Content><FuncFlag>1</FuncFlag></xml>”; } private int ConvertDateTimeInt(System.DateTime time) { System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); return (int)(time – startTime).TotalSeconds; }} //微信请求类public class RequestXML{ private String toUserName = String.Empty; /// <summary> /// 公众号 /// </summary> public String ToUserName { get { return toUserName; } set { toUserName = value; } } private String fromUserName = “”; /// <summary> /// 发送方微信号 /// </summary> public String FromUserName { get { return fromUserName; } set { fromUserName = value; } } private String createTime = String.Empty; /// <summary> /// 创建时间 /// </summary> public String CreateTime { get { return createTime; } set { createTime = value; } } private String msgType = String.Empty; /// <summary> /// 信息类型 地理位置:location,文本消息:text,消息类型:image /// </summary> public String MsgType { get { return msgType; } set { msgType = value; } } private String content = String.Empty; /// <summary> /// 信息内容 /// </summary> public String Content { get { return content; } set { content = value; } } private String location_X = String.Empty; /// <summary> /// 地理位置纬度 /// </summary> public String Location_X { get { return location_X; } set { location_X = value; } } private String location_Y = String.Empty; /// <summary> /// 地理位置经度 /// </summary> public String Location_Y { get { return location_Y; } set { location_Y = value; } } private String scale = String.Empty; /// <summary> /// 地图缩放大小 /// </summary> public String Scale { get { return scale; } set { scale = value; } } private String mapInfo = String.Empty; /// <summary> /// 地理位置信息 /// </summary> public String MapInfo { get { return mapInfo; } set { mapInfo = value; } } private String picUrl = String.Empty; /// <summary> /// 图片链接 /// </summary> public String PicUrl { get { return picUrl; } set { picUrl = value; } } }
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