This article mainly shares the tutorial on how to develop WeChat public platform instances using .net. It gives a more detailed description of the principles of WeChat public platform development and the corresponding .net implementation methods. It is very practical and friends in need can refer to it

The example of this article describes the method of developing WeChat public platform with .net. Share it with everyone for your reference. The specific implementation method is as follows:

1. Description:

The public platform information interface provides developers with a new message processing method. Only after applying to become a developer , you can use the development function of the public platform. Here you need to fill in a URL and a Token. These two pieces of information also require you to have your own server (external network server) resources. The Token can be filled in by the developer arbitrarily. The URL is is the link address of the interface configuration information. In this article, I use the method of creating a simple website, configure the relevant interface information in the background program of one page, and then publish it to the external network server. Finally, you can access this The link address of the page is the URL that should be filled in here.

2. Interface configuration process:

1. Website access - verification signature:

code As follows:

const string Token = "aka";//定義一個(gè)局部變量不可以被修改，這里定義的變量要與接口配置信息中填寫的Token一致
protected void Page_Load(object sender, EventArgs e)
{
        string postStr = "";
        Valid();//校驗(yàn)簽名,當(dāng)填入的信息提交之后頁面有提示“你已成功成為公眾平臺開發(fā)者，可以使用公眾平臺的開發(fā)功能”這個(gè)的時(shí)候，接下來你就需要注釋掉這個(gè)校驗(yàn)的方法，使得后面的消息回復(fù)得以正常運(yùn)作
        if (Request.HttpMethod.ToLower() == "post")//當(dāng)普通微信用戶向公眾賬號發(fā)消息時(shí)，微信服務(wù)器將POST該消息到填寫的URL上
        {
            postStr = PostInput();
            if (string.IsNullOrEmpty(postStr) == false)
            {
                //WriteLog(postStr,Server);//計(jì)入日記
                ResponseMsg(postStr);
            }
        }
}
private void Valid()
{
        string echoStr = Request.QueryString["echoStr"].ToString();
        if (CheckSignature())
        {
            if (!string.IsNullOrEmpty(echoStr))
            {
                Response.Write(echoStr);
                Response.End();
            }
        }
}

The code is as follows:

/// <summary>
/// 驗(yàn)證微信簽名
/// </summary>
/// <returns></returns>
private bool CheckSignature()
{
        string signature = Request.QueryString["signature"].ToString();
        string timestamp = Request.QueryString["timestamp"].ToString();
        string nonce = Request.QueryString["nonce"].ToString();
        string[] ArrTmp = { Token, timestamp, nonce };
        Array.Sort(ArrTmp);//字典排序
        string tmpStr = string.Join("", ArrTmp);
        tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");//對該字符串進(jìn)行sha1加密
        tmpStr = tmpStr.ToLower();//對字符串中的字母部分進(jìn)行小寫轉(zhuǎn)換，非字母字符不作處理
        //WriteLog(tmpStr, Server);//計(jì)入日志
        if (tmpStr == signature)//開發(fā)者獲得加密后的字符串可與signature對比，標(biāo)識該請求來源于微信。開發(fā)者通過檢驗(yàn)signature對請求進(jìn)行校驗(yàn)，若確認(rèn)此次GET請求來自微信服務(wù)器，請?jiān)瓨臃祷豦chostr參數(shù)內(nèi)容，則接入生效，否則接入失敗
        {
            return true;
        }
        else
            return false;
}
/// <summary>
/// 獲取post返回來的數(shù)據(jù)
/// </summary>
/// <returns></returns>
private string PostInput()
{
        Stream s = System.Web.HttpContext.Current.Request.InputStream;
        byte[] b = new byte[s.Length];
        s.Read(b, 0, (int)s.Length);
        return Encoding.UTF8.GetString(b);
}
/// <summary>
///返回微信信息結(jié)果
/// </summary>
/// <param name="weixinXML"></param>
private void ResponseMsg(string weixinXML)
{
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(weixinXML);//讀取XML字符串
            XmlElement rootElement = doc.DocumentElement;
            XmlNode MsgType = rootElement.SelectSingleNode("MsgType");//獲取字符串中的消息類型
            string resxml = "";
            if (MsgType.InnerText == "text")//如果消息類型為文本消息
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                    MsgType = MsgType.InnerText,
                    Content = rootElement.SelectSingleNode("Content").InnerText,
                    MsgId = rootElement.SelectSingleNode("MsgId").InnerText
                };
                resxml += "<xml><ToUserName><![CDATA[" + model.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + model.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime>";
                if (!string.IsNullOrEmpty(model.Content))//如果接收到消息
                {
                    if (model.Content.Contains(" 你好") || model.Content.Contains(" 好") || model.Content.Contains("hi") || model.Content.Contains("hello"))// 你好
                    {
                        resxml += "<MsgType><![CDATA[text]]></MsgType><Content><![CDATA[你好，有事請留言，偶會及時(shí)回復(fù)你的。]]></Content><FuncFlag>0</FuncFlag></xml>";
                    }
                 }
                 else//沒有接收到消息
                {
                    resxml += "<MsgType><![CDATA[text]]></MsgType><Content><![CDATA[親，感謝您對我的關(guān)注，有事請留言。]]></Content><FuncFlag>0</FuncFlag></xml>";
                }
                Response.Write(resxml);
            }
            if (MsgType.InnerText == "image")//如果消息類型為圖片消息
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                    MsgType = MsgType.InnerText,
                    PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText,
                    MsgId = rootElement.SelectSingleNode("MsgId").InnerText
                };
                resxml += "<xml><ToUserName><![CDATA[" + model.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + model.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[news]]></MsgType><ArticleCount>1</ArticleCount><Articles><item><Title><![CDATA[歡迎您的光臨！]]></Title><Description><![CDATA[非常感謝您的關(guān)注！]]></Description><PicUrl><![CDATA[http://miracleart.cn/]]></PicUrl><Url><![CDATA[http://miracleart.cn/]]></Url></item></Articles><FuncFlag>0</FuncFlag></xml>";
                Response.Write(resxml);
            }
            else//如果是其余的消息類型
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                };
                resxml += "<xml><ToUserName><![CDATA[" + model.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + model.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[親，感謝您對我的關(guān)注，有事請留言，我會及時(shí)回復(fù)你的哦。]]></Content><FuncFlag>0</FuncFlag></xml>";
                Response.Write(resxml);
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        Response.End();
}
/// <summary>
/// datetime轉(zhuǎn)換成unixtime
/// </summary>
/// <param name="time"></param>
/// <returns></returns>
private int ConvertDateTimeInt(System.DateTime time)
{
        System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
        return (int)(time - startTime).TotalSeconds;
}
/// <summary>
/// 寫日志(用于跟蹤)，可以將想打印出的內(nèi)容計(jì)入一個(gè)文本文件里面，便于測試
/// </summary>
public static void WriteLog(string strMemo, HttpServerUtility server)
{
        string filename = server.MapPath("/logs/log.txt");//在網(wǎng)站項(xiàng)目中建立一個(gè)文件夾命名logs（然后在文件夾中隨便建立一個(gè)web頁面文件，避免網(wǎng)站在發(fā)布到服務(wù)器之后看不到預(yù)定文件）
        if (!Directory.Exists(server.MapPath("//logs//")))
            Directory.CreateDirectory("//logs//");
        StreamWriter sr = null;
        try
        {
            if (!File.Exists(filename))
            {
                sr = File.CreateText(filename);
            }
            else
            {
                sr = File.AppendText(filename);
            }
            sr.WriteLine(strMemo);
        }
        catch
        {
        }
        finally
        {
            if (sr != null)
                sr.Close();
        }
}

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