1.1.要有appid和密钥

2.2.获取token

publicstringget_token(){stringwx_url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wxf050f84e644a8077&secret=65554946e2a6a47b8aa1c56a4ae1edc7";wx_url=string.Format(wx_url);stringwx_result=Utils.HttpGet(wx_url);JObjectjo=JObject.Parse(wx_result);stringaccess_token="";if(jo["access_token"]!=null){access_token=Utils.ObjectToStr(jo["access_token"]);}returnaccess_token;}

3.3.生成二维码，保存图片

publicstringQR_code(stringmd5,stringsendtime,stringpage,stringscene=""){JavaScriptSerializerjsSerializer=newJavaScriptSerializer();jsSerializer.MaxJsonLength=Int32.MaxValue;stringappid="1314520";stringkey="hV72WsDa37LPZxQSjL";DateTimetime=Convert.ToDateTime(sendtime);TimeSpans1=DateTime.Now-time;if(s1.Minutes10){return"{"status":0,"msg":"请求时间失效了！"}";}stringstr=appid+key+sendtime;stringsign=System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"md5").ToUpper();if(sign!=md5){return"{"status":0,"msg":"加密字符串不正确！"}";}stringwidth="460";stringaccess_token=get_token();stringwx_url="https://api.weixin.qq.com/wxa/getwxacode?access_token="+access_token+"";stringwx_result=HttpPost(wx_url,"{"path":""+page+"","width":"430"}");//pages/index?query=1Imageimage1=Base64ToImage(wx_result);DateTimedt=DateTime.Now;stringpath="/upload/201806/22/"+dt.ToString("yyyyMMddHHmmss")+".jpg";image1.Save(Server.MapPath(path));return"{"status":1,"imgurl":""+path+"","data":"data:image/jpg;base64,"+wx_result+""}";}//threeebase64编码的字符串转为图片publicSystem.Drawing.ImageBase64ToImage(stringbase64String){byte[]imageBytes=Convert.FromBase64String(base64String);MemoryStreamms=newMemoryStream(imageBytes,0,imageBytes.Length);ms.Write(imageBytes,0,imageBytes.Length);System.Drawing.Imageimage=System.Drawing.Image.FromStream(ms,true);returnimage;}[WebMethod]publicstringHttpPost(stringUrl,stringpostDataStr){HttpWebRequestrequest=(HttpWebRequest)WebRequest.Create(Url);request.Method="POST";request.ContentType="application/json";request.ContentLength=Encoding.UTF8.GetByteCount(postDataStr);StreammyRequestStream=request.GetRequestStream();StreamWritermyStreamWriter=newStreamWriter(myRequestStream,Encoding.Default);myStreamWriter.Write(postDataStr);myStreamWriter.Close();HttpWebResponseresponse=(HttpWebResponse)request.GetResponse();StreammyResponseStream=response.GetResponseStream();try{Imageimage=Image.FromStream(myResponseStream);myResponseStream.Close();stringretString=ToBase64(image);returnretString;}catch{myResponseStream.Close();return"";}}[WebMethod]publicstringToBase64(Imageimg){MemoryStreamms=newMemoryStream();img.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);byte[]arr=newbyte[ms.Length];ms.Position=0;ms.Read(arr,0,(int)ms.Length);ms.Close();Stringstrbaser64=Convert.ToBase64String(arr);returnstrbaser64;}