开发日志：企业微信实现扫码登录（WEB）

<%@ WebHandler Language="C#" Class="qywxlogin" Debug="true" %>

using System;
using System.IO;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Web.SessionState;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Text;

using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Linq;

public class qywxlogin : IHttpHandler, IRequiresSessionState
{
    //企业微信
    public string appid = "";
    publi  string secret = "";
    public string PhyPath = "";
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Cookies.Add(new HttpCookie("ASP.NET_SessionId", context.Session.SessionID));
        
        PhyPath = context.Server.MapPath("/");
        string type = context.Request["type"];
        switch(type) {
            case "qywxLogin": qywxLogin(context); break;
            default: context.Response.Write("非法访问"); break;
        }
        context.Response.End();
    }
    public void qywxLogin(HttpContext c){
    
        string state = c.Request["state"];
        string code = c.Request["code"]; 
    
        string url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid="+appid+"&corpsecret="+secret+"&debug=1";
        var token = HttpGet(url);
        if(!string.IsNullOrEmpty(token)) {
            JObject sk = JObject.Parse(token);
            if(sk["access_token"] != null) {
                string accessToken =sk["access_token"].ToString();
                url ="https://qyapi.weixin.qq.com/cgi-bin/user/getuserinfo?access_token="+accessToken+"&code="+code+"&debug=1";
                var getuserinfo =HttpGet(url);
                JObject sk1 = JObject.Parse(getuserinfo);
                if(sk1["UserId"] != null) {
                    string UserId=sk1["UserId"].ToString(); //企业微信通讯录里的账户名称
                    string sql ="select * from [Base_Users] where WeixinID='"+UserId+"'";
                    DataTable dtW = DataBase.ExecuteTable(sql);
                    if(dtW != null && dtW.Rows.Count > 0) {
                        //写 session
                    }else{
　　　　　　　　　　　　　　 //绑定页面
                        c.Response.Redirect("qywxbind.html?WeixinID="+UserId);
                    } 
                }else{
                    c.Response.Write(getuserinfo);
                }
             }else{
                c.Response.Write(token);
            }
        }else{
            c.Response.Write("验证错误");
        }
    }
    #region GET/POST
    public string HttpGet(string url) {
        StringBuilder builder = new StringBuilder();
        builder.AppendLine("=========================================================");
        builder.AppendLine("url:" + url);
        string retString = string.Empty;
        try {
            string errMsg = string.Empty;
            HttpWebRequest wbRequest = (HttpWebRequest)WebRequest.Create(url);
            wbRequest.Method = "GET";
            wbRequest.ContentType = "text/html;charset=UTF-8";
            HttpWebResponse wbResponse = (HttpWebResponse)wbRequest.GetResponse();
            using(Stream responseStream = wbResponse.GetResponseStream()) {
                using(StreamReader sReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"))) {
                    retString = sReader.ReadToEnd();
                }
            }
            builder.AppendLine(retString);
            
        } catch(Exception ex) {
            builder.AppendLine("errcode:" + ex.HResult);
            builder.AppendLine("errmsg:" + ex.Message);
        }
        LogWeChat(builder.ToString(), "Http");
        return retString;
    }
    public string HttpPost(string url, string param = "", Dictionary<string, string> header = null, 
　　　　　string contentType = "application/json") {
        StringBuilder builder = new StringBuilder();
        builder.AppendLine("=========================================================");
        builder.AppendLine("url:" + url);
        builder.AppendLine("param:" + param);
        string data = "";
        try {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = contentType;
            request.Accept = "*/*";
            request.Timeout = 15000;
            request.AllowAutoRedirect = false;
            if(header != null && header.Count > 0) {
                foreach(var item in header) {
                    request.Headers.Add(item.Key, item.Value);
                }
            }
            if(!string.IsNullOrWhiteSpace(param)) {
                byte[] byteData = UTF8Encoding.UTF8.GetBytes(param.ToString());
                request.ContentLength = byteData.Length;
                using(Stream postStream = request.GetRequestStream()) {
                    postStream.Write(byteData, 0, byteData.Length);
                    postStream.Close();
                }
            }
            using(var response = request.GetResponse()) {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                data = reader.ReadToEnd();
            }
            
            builder.AppendLine(data);
        } catch(Exception ex) {
            builder.AppendLine("errcode:" + ex.HResult);
            builder.AppendLine("errmsg:" + ex.Message);
        }
        LogWeChat(builder.ToString(), "Http");
        return data;
    }
    #endregion
    #region Logging
    public void LogWeChat(string contents, string filename) {
        try {
            if(string.IsNullOrWhiteSpace(contents)) return;
            string msg = string.Format(@"{0}|{1}|" + filename + "|{2}" + Environment.NewLine, DateTime.Now, "", contents);
            string t = "logs";
            string path = PhyPath + t;
            string logfile = path + "/wechat_" + filename + "_" + DateTime.Now.ToString("yyyyMMdd") + ".log";
            if(!Directory.Exists(path)) {
                Directory.CreateDirectory(path);
            }
            File.AppendAllText(logfile, msg);
        } catch {

        }
    }
    #endregion
    public bool IsReusable {
        get {
            return false;
        }
    }
}