微信平台ASPX高级定制开发（一）：如何使用C#建立响应微信接入和自动回复的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.XPath;using System.Security;
using System.Net;
using System.Collections;
using System.Security.Cryptography;

  private bool checkSignature(string signature,string timestamp,string nonce,string token)
        {
            ArrayList tmpArray = new ArrayList();
            tmpArray.Add(token);
            tmpArray.Add(timestamp);
            tmpArray.Add(nonce);
            tmpArray.Sort();
            string tmpStr = (string)tmpArray[0] + (string)tmpArray[1] + (string)tmpArray[2];

            //建立SHA1对象
            SHA1 sha = new SHA1CryptoServiceProvider();

            //将mystr转换成byte[]
            ASCIIEncoding enc = new ASCIIEncoding();
            byte[] dataToHash = enc.GetBytes(tmpStr);

            //Hash运算
            byte[] dataHashed = sha.ComputeHash(dataToHash);

            //将运算结果转换成string
            string hash = BitConverter.ToString(dataHashed).Replace("-", "");
            log("hash:" + hash); //记录日志，不需要可以注释掉

            if(hash.ToLower()==signature.ToLower())
                return true;
            else
                return false;

        }

 private void log(string stringinput)
        {
            StreamWriter sw = new StreamWriter("C:\\微信日志.txt", true);
            sw.WriteLine(DateTime.Now.ToString() + "," + stringinput);
            sw.Close();
        }

private void LandMPUpdateSQLServer(HttpContext context)
{                    
SqlConnection connMpDb = new SqlConnection(connectionString); //connectionString为预先定义的连接串
                    connMpDb.Open();
                    SqlCommand comMpDb = new SqlCommand("update 微信号列表 set signature=@signature,timestamp=@timestamp,nonce=@nonce,echostr=@echostr,[验证]=1 Where ID=*****", connMpDb);
                    foreach (string s in OpenParameters) //OpenParameters 为4个参数名的数组，即 "signature","timestamp","nonce","echostr"
                    {
                        SqlParameter sp = comMpDb.Parameters.Add("@" + s, System.Data.SqlDbType.VarChar);
                        if (context.Request.QueryString.AllKeys.Contains(s))
                            sp.Value = context.Request.QueryString[s];
                        else
                            sp.Value = "No Value";

                    }
                    comMpDb.ExecuteNonQuery();
                    connMpDb.Close();
}

        //接入参数
        private string[] OpenParameters = { "signature", "timestamp", "nonce", "echostr" };

        //SQL连接字串，您可以定义成一个字符串，我是从系统设置里取的
        private string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["testmpConnectionString"].ConnectionString;

 1                bool isLanding = true;
 2                 foreach (string s in OpenParameters)
 3                 {
 4                     if (!context.Request.QueryString.AllKeys.Contains(s))
 5                         isLanding = false; 
 6 
 7                 }
 8                 
 9                 //toke 为 AAA时验证是否是微信的请求
10                 if (isLanding && checkSignature(context.Request.QueryString["signature"], context.Request.QueryString["timestamp"], context.Request.QueryString["nonce"],"AAA"))
11                 {
12                     context.Response.ContentType = "text/plain";
13                     string echoString = context.Request.QueryString["echostr"];
14                     LandMPUpdateSQLServer(context);
15                     context.Response.Write(echoString);
16                 }
17                 else
18                 {
19                     //读取发过来的信息到inputXml变量中
20                     Stream sin = context.Request.InputStream;
21                     byte[] readBytes;
22                     readBytes = new byte[sin.Length];
23                     sin.Read(readBytes, 0, readBytes.Length);
24                     string inputXml = Encoding.UTF8.GetString(readBytes);
25 
26                     //使用XMLDocument加载信息结构
27                     XmlDocument xmlDoc = new XmlDocument();
28                     xmlDoc.LoadXml(inputXml);
29                     string stringMsgId = xmlDoc.SelectSingleNode("//MsgId").InnerText; 
30                     
31                     //把传过来的XML数据各个字段区分出来，并且填到fields这个字典变量中去
32                     Dictionary<string, string> fields = new Dictionary<string, string>();
33                     foreach (XmlNode x in xmlDoc.SelectSingleNode("/xml").ChildNodes)
34                     {
35                         fields.Add(x.Name, x.InnerText);                      
36 
37                     }
38                     //形成返回格式的XML文档
39                     string returnXml = "<xml><ToUserName><![CDATA[" +
40                       fields["FromUserName"] + "]]></ToUserName><FromUserName><![CDATA[" +
41                       fields["ToUserName"] + "]]></FromUserName><CreateTime>" +
42                       DateTime.Now.Subtract(new DateTime(1970, 1, 1, 8, 0, 0)).TotalSeconds.ToString() + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[" +
43                       fields["Content"] + "]]></Content></xml>";
44 
45                     context.Response.ContentType = "text/xml";              
46                     context.Response.Write(returnXml);
47 
48                 }