c# 微信生成带参数的二维码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;
using LitJson;

/// <summary>
/// Ticket 的摘要说明
/// </summary>
public class Ticket
{
public Ticket()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static  string GetewmPic( string scene_id)
{
string tocket = "";
string pic="";
if (Config.GetInstance().SystemSetting.Appid!=""&&Config.GetInstance().SystemSetting.seconid!="")
{

string appid = Config.GetInstance().SystemSetting.Appid;// "wx5955bd71e310a7b5";
string secret = Config.GetInstance().SystemSetting.seconid;// "2d6b6ec95cde8bc2908713bde4c92434";
string parm = "grant_type=client_credential&appid=" + appid + "&secret=" + secret + "";//2d6b6ec95cde8bc2908713bde4c92434
string url = "https://api.weixin.qq.com/cgi-bin/token";
string b = webRequestGet(url, parm);
b = SubString1(b, "{\"access_token\":\"", "\",\"expires_in\":7200}");//acc_tonke

string poster = "{\"action_name\": \"QR_LIMIT_SCENE\",\"action_info\": {\"scene\": { \"scene_id\": "+scene_id+" } }";//二维码永久请求格式

string tockes = GetPage("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=" + b + "", poster + "");
if(tockes.IndexOf("ticket")>-1)
{
JsonData bejson = JsonMapper.ToObject(tockes);
tocket =(String)bejson["ticket"];
tocket = Uri.EscapeDataString(tocket);//TICKET必需UrlEncode
}

string Picurl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+tocket+"";

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(Picurl);
req.Proxy = null;
req.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0";
req.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.8,zh-hk;q=0.6,ja;q=0.4,zh;q=0.2");
req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
//HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();

System.Drawing.Image img = System.Drawing.Image.FromStream(req.GetResponse().GetResponseStream());
string newfilename = "ewm_" + scene_id + ".jpg";//二维码图片路径
// string filepath = @"D:\网站项目\wsl\ewmPic\" + newfilename;
string address = HttpContext.Current.Server.MapPath(SysConfig.ApplicationPath+"/ewmPic/"+newfilename);
img.Save(address);

pic = newfilename;
}
return pic;

}

public static string SubString1(string sourceStr, string beginStr, string endStr)
{
int begin = sourceStr.IndexOf(beginStr);
if (begin == -1) return "";
int end = sourceStr.IndexOf(endStr, begin + beginStr.Length);
if (end == -1 && end == begin + beginStr.Length) return "";

return sourceStr.Substring(begin + beginStr.Length, end - begin - beginStr.Length);

}
/// <summary>
/// GET 提交调用抓取
/// </summary>
/// <param name="url">提交地址</param>
/// <param name="param">参数</param>
/// <returns>string</returns>
public static string webRequestGet(string url, string param)
{
byte[] bs = System.Text.Encoding.UTF8.GetBytes(param);

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + "?" + param);
req.Method = "GET";
using (WebResponse wr = req.GetResponse())
{
//在这里对接收到的页面内容进行处理

Stream strm = wr.GetResponseStream();

StreamReader sr = new StreamReader(strm, System.Text.Encoding.UTF8);

string line;

System.Text.StringBuilder sb = new System.Text.StringBuilder();

while ((line = sr.ReadLine()) != null)
{
sb.Append(line);
}
sr.Close();
strm.Close();
return sb.ToString();
}
}
public static string GetPage(string posturl, string postData)
{
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
Encoding encoding = Encoding.UTF8;
byte[] data = encoding.GetBytes(postData);
// 准备请求...
try
{
// 设置参数
request = WebRequest.Create(posturl) as HttpWebRequest;
CookieContainer cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
outstream = request.GetRequestStream();
outstream.Write(data, 0, data.Length);
outstream.Close();
//发送请求并获取相应回应数据
response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才开始向目标网页发送Post请求
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding);
//返回结果网页（html）代码
string content = sr.ReadToEnd();
string err = string.Empty;
return content;
}
catch (Exception ex)
{
string err = ex.Message;
return string.Empty;
}
}

}