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
<pre class="csharp" name="code">   /// <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。

<pre class="html" name="code">    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 class=csharp name="code">    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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