微信小程序 带参数二维码 C# asp.net 服务端程序

作者：采购员乙，来自原文地址 
第一步 获取access_token：

文档如下：

http请求方式: GET 
 
代码如下：

string result = HttpGet("");
    public static string HttpGet(string Url)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
        request.Method = "GET";
        request.ContentType = "text/html;charset=UTF-8";
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream myResponseStream = response.GetResponseStream();
        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
        string retString = myStreamReader.ReadToEnd();
        myStreamReader.Close();
        myResponseStream.Close();
        return retString;
    }

其中****改成自己的。具体到微信公众平台小程序里设置开发设置里找。

第二步 获取推广二维码

文档：

 
POST 参数说明

参数 默认值 说明 
path 不能为空，最大长度 128 字节 
width 430 二维码的宽度 代码：

        public static void PostMoths(string access_token)
    {
        string _url = "" + access_token;
        string strURL = _url;
        System.NET.HttpWebRequest request;
        request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
        request.Method = "POST";
        request.ContentType = "application/json;charset=UTF-8";
        JsonData _data = new JsonData();
        _data["path"] = "pages/index?query=1";
        _data["width"] = "430";
        string _jso = _data.ToJson();
        //string paraUrlCoded = param;
        byte[] payload;
        //payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
        payload = System.Text.Encoding.UTF8.GetBytes(_jso);
        request.ContentLength = payload.Length;
        Stream writer = request.GetRequestStream();
        writer.Write(payload, 0, payload.Length);
        writer.Close();
        System.Net.HttpWebResponse response;
        response = (System.Net.HttpWebResponse)request.GetResponse();
        System.IO.Stream s;
        s = response.GetResponseStream();
        string StrDate = "";
        string strValue = "";
        byte[] tt = StreamToBytes(s);
        //将流保存在c盘test.png文件下
        System.IO.File.WriteAllBytes(@"d:\test.png", tt);
    }
    ///将数据流转为byte[]
    public static byte[] StreamToBytes(Stream stream)
    {
        List<byte> bytes = new List<byte>();
        int temp = stream.ReadByte();
        while (temp != -1)
        {
            bytes.Add((byte)temp);
            temp = stream.ReadByte();
        }
        return bytes.ToArray();
    }

最后保存在d盘的图片就是推广二维码，可以讲服务器连接地址发给微信小程序，供微信小程序调用。