asp.net微信公众平台开发

http://mp.weixin.qq.com/wiki/index.php?title=%E6%B6%88%E6%81%AF%E6%8E%A5%E5%8F%A3%E6%8C%87%E5%8D%97

微信公众平台接口指南

微信公众平台的开发比较简单，首先是网址接入

公众平台用户提交信息后，微信服务器将发送GET请求到填写的URL上，并且带上四个参数：

参数	描述
signature	微信加密签名
timestamp	时间戳
nonce	随机数
echostr	随机字符串

开发者通过检验signature对请求进行校验（下面有校验方式）。若确认此次GET请求来自微信服务器，请原样返回echostr参数内容，则接入生效，否则接入失败。

signature结合了开发者填写的token参数和请求中的timestamp参数、nonce参数。

加密/校验流程：
1. 将token、timestamp、nonce三个参数进行字典序排序
2. 将三个参数字符串拼接成一个字符串进行sha1加密
3. 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信

[csharp] view plaincopy

/// <summary>

/// 验证签名

/// </summary>

/// <param name="signature"></param>

/// <param name="timestamp"></param>

/// <param name="nonce"></param>

/// <returns></returns>

public static bool CheckSignature(String signature, String timestamp, String nonce)

{

String[] arr = new String[] { token, timestamp, nonce };

// 将token、timestamp、nonce三个参数进行字典序排序

Array.Sort<String>(arr);

StringBuilder content = new StringBuilder();

for (int i = 0; i < arr.Length; i++)

{

content.Append(arr[i]);

}

String tmpStr = SHA1_Encrypt(content.ToString());

// 将sha1加密后的字符串可与signature对比，标识该请求来源于微信

return tmpStr != null ? tmpStr.Equals(signature) : false;

}

/// <summary>

/// 使用缺省密钥给字符串加密

/// </summary>

/// <param name="Source_String"></param>

/// <returns></returns>

public static string SHA1_Encrypt(string Source_String)

{

byte[] StrRes = Encoding.Default.GetBytes(Source_String);

HashAlgorithm iSHA = new SHA1CryptoServiceProvider();

StrRes = iSHA.ComputeHash(StrRes);

StringBuilder EnText = new StringBuilder();

foreach (byte iByte in StrRes)

{

EnText.AppendFormat("{0:x2}", iByte);

}

return EnText.ToString();

}

接入后是消息推送当普通微信用户向公众账号发消息时，微信服务器将POST该消息到填写的URL上。

[csharp] view plaincopy

protected void Page_Load(object sender, EventArgs e)

{

if (Request.HttpMethod.ToUpper() == "GET")

{

// 微信加密签名

string signature = Request.QueryString["signature"];

// 时间戳

string timestamp = Request.QueryString["timestamp"];

// 随机数

string nonce = Request.QueryString["nonce"];

// 随机字符串

string echostr = Request.QueryString["echostr"];

if (WeixinServer.CheckSignature(signature, timestamp, nonce))

{

Response.Write(echostr);

}

}

else if (Request.HttpMethod.ToUpper() == "POST")

{

StreamReader stream = new StreamReader(Request.InputStream);

string xml = stream.ReadToEnd();

processRequest(xml);

}

}

/// <summary>

/// 处理微信发来的请求

/// </summary>

/// <param name="xml"></param>

public void processRequest(String xml)

{

try

{

// xml请求解析

Hashtable requestHT = WeixinServer.ParseXml(xml);

// 发送方帐号（open_id）

string fromUserName = (string)requestHT["FromUserName"];

// 公众帐号

string toUserName = (string)requestHT["ToUserName"];

// 消息类型

string msgType = (string)requestHT["MsgType"];

//文字消息

if (msgType == ReqMsgType.Text)

{

// Response.Write(str);

string content = (string)requestHT["Content"];

if(content=="1")

{

// Response.Write(str);

Response.Write(GetNewsMessage(toUserName, fromUserName));

return;

}

if (content == "2")

{

Response.Write(GetUserBlogMessage(toUserName, fromUserName));

return;

}

if (content == "3")

{

Response.Write(GetGroupMessage(toUserName, fromUserName));

return;

}

if (content == "4")

{

Response.Write(GetWinePartyMessage(toUserName, fromUserName));

return;

}

Response.Write(GetMainMenuMessage(toUserName, fromUserName, "你好，我是vinehoo,"));

}

else if (msgType == ReqMsgType.Event)

{

// 事件类型

String eventType = (string)requestHT["Event"];

// 订阅

if (eventType==ReqEventType.Subscribe)

{

Response.Write(GetMainMenuMessage(toUserName, fromUserName, "谢谢您的关注！,"));

}

// 取消订阅

else if (eventType==ReqEventType.Unsubscribe)

{

// TODO 取消订阅后用户再收不到公众号发送的消息，因此不需要回复消息

}

// 自定义菜单点击事件

else if (eventType==ReqEventType.CLICK)

{

// TODO 自定义菜单权没有开放，暂不处理该类消息

}

}

else if (msgType == ReqMsgType.Location)

{

}

}

catch (Exception e)

{

}

}<pre name="code" class="csharp"> protected void Page_Load(object sender, EventArgs e)

{

if (Request.HttpMethod.ToUpper() == "GET")

{

// 微信加密签名

string signature = Request.QueryString["signature"];

// 时间戳

string timestamp = Request.QueryString["timestamp"];

// 随机数

string nonce = Request.QueryString["nonce"];

// 随机字符串

string echostr = Request.QueryString["echostr"];

if (WeixinServer.CheckSignature(signature, timestamp, nonce))

{

Response.Write(echostr);

}

}

else if (Request.HttpMethod.ToUpper() == "POST")

{

StreamReader stream = new StreamReader(Request.InputStream);

string xml = stream.ReadToEnd();

processRequest(xml);

}

}

/// <summary>

/// 处理微信发来的请求

/// </summary>

/// <param name="xml"></param>

public void processRequest(String xml)

{

try

{

// xml请求解析

Hashtable requestHT = WeixinServer.ParseXml(xml);

// 发送方帐号（open_id）

string fromUserName = (string)requestHT["FromUserName"];

// 公众帐号

string toUserName = (string)requestHT["ToUserName"];

// 消息类型

string msgType = (string)requestHT["MsgType"];

//文字消息

if (msgType == ReqMsgType.Text)

{

// Response.Write(str);

string content = (string)requestHT["Content"];

if(content=="1")

{

// Response.Write(str);

Response.Write(GetNewsMessage(toUserName, fromUserName));

return;

}

if (content == "2")

{

Response.Write(GetUserBlogMessage(toUserName, fromUserName));

return;

}

if (content == "3")

{

Response.Write(GetGroupMessage(toUserName, fromUserName));

return;

}

if (content == "4")

{

Response.Write(GetWinePartyMessage(toUserName, fromUserName));

return;

}

Response.Write(GetMainMenuMessage(toUserName, fromUserName, "你好，我是vinehoo,"));

}

else if (msgType == ReqMsgType.Event)

{

// 事件类型

String eventType = (string)requestHT["Event"];

// 订阅

if (eventType==ReqEventType.Subscribe)

{

Response.Write(GetMainMenuMessage(toUserName, fromUserName, "谢谢您的关注！,"));

}

// 取消订阅

else if (eventType==ReqEventType.Unsubscribe)

{

// TODO 取消订阅后用户再收不到公众号发送的消息，因此不需要回复消息

}

// 自定义菜单点击事件

else if (eventType==ReqEventType.CLICK)

{

// TODO 自定义菜单权没有开放，暂不处理该类消息

}

}

else if (msgType == ReqMsgType.Location)

{

}

}

catch (Exception e)

{

}

}</pre><br>

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