WeChat development asp.net

I have recently been exposed to WeChat development, and I have also been looking at PHP code, but in the end I still used c# language;

I created a new index.ashx file in the background, which is faster;

First of all The top quote

using System.IO;
using System.Xml;

One is to receive the xml file stream, and the other is to process the xml file later;

public class index : IHttpHandler {

    private readonly string Token = "xxxx";//与微信公众账号后台的Token设置保持一致，区分大小写。
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";

        string signature = context.Request["signature"];
        string timestamp = context.Request["timestamp"];
        string nonce = context.Request["nonce"];
        string echostr = context.Request["echostr"];

        if (context.Request.HttpMethod == "GET")
        {
            if (CheckSign(signature, timestamp, nonce))
            {
                context.Response.Output.Write(echostr);
            }
        }
        else
        {
            //post method - 当有用户想公众账号发送消息时触发，写事件
        }

        context.Response.End();
    }

First set up the Token and receive various parameters. The request method is sent in the get method;

The main thing here is the CheckSign() function;

public bool CheckSign(string signature, string timestamp, string nonce)
    {
        string[] strs = new string[] { Token, timestamp, nonce };
        Array.Sort(strs);//排序
        string strNew = string.Join("", strs);//连接成字符串
        strNew = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strNew, "SHA1");//加密
        if (signature == strNew.ToLower())
            return true;
        return false;
    }

In fact, the awareness here It is to receive A/B/C/D, E is customized, B/C/E generates F, compare it with A, if equal, return the output D;

string xmlFromWeChat = new StreamReader(context.Request.InputStream).ReadToEnd();//读取XML流
            XmlDocument xmldocument = new XmlDocument();
            xmldocument.LoadXml(xmlFromWeChat);加载字符串
            string fromContent = xmldocument.GetElementsByTagName("Content").Item(0).InnerText;
            string fromMsgType = xmldocument.GetElementsByTagName("MsgType").Item(0).InnerText;

is not well written Point it out! !

In this way we can judge the received data and make corresponding operations. The most important thing is to be familiar with the interface;

Here is an example to illustrate , maybe not very abstract:

public string receiveText(string xmlFromWeChat)
    {
        XmlDocument xmlText = new XmlDocument();
        xmlText.LoadXml(xmlFromWeChat);
        string content;
        string xmlStr;
        string keyword = xmlText.GetElementsByTagName("Content").Item(0).InnerText.Trim();
        
               content = "欢迎关注xxx!";
               string[] defArray = { xmlText.GetElementsByTagName("FromUserName").Item(0).InnerText, 
                              xmlText.GetElementsByTagName("ToUserName").Item(0).InnerText, 
                              ConvertDateTimeInt(DateTime.Now).ToString(),
                              content};
               xmlStr = transmitText(defArray);
               
        }
        
        
        return xmlStr;
    }

public string transmitText(string[] xmlArray)
    {
        string xmlstring = @"<xml>
                            <tousername></tousername>
                            <fromusername></fromusername>
                            <createtime>{2}</createtime>
                            <msgtype></msgtype>
                            <content></content>
                            </xml>";
        string xmlstr = string.Format(xmlstring, xmlArray);
        return xmlstr;
    }

This is a simple reply;

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