微信網頁授權登入(c# Webform)
阿新 • • 發佈：2019-01-28
##Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="X-UA-Compatible" content="chrome=1,webkit=1,IE=edge" /> <meta name="viewport" content="user-scalable=no,width=device-width,initial-scale=1.0,maximum-scale=1.0" /> <title>微信授權登入</title> </head> <body> </body> </html>
##Default.aspx.cs
using System;
using Newtonsoft.Json;
public partial class _Default : WeiXinPage
{
protected override void OnLoad(EventArgs e)
{
Response.Write(JsonConvert.SerializeObject(Data));
base.OnLoad(e);
}
}
##WeiXinPage.cs
using System; using System.Collections.Generic; using System.Web; using System.Web.SessionState; using System.Web.UI; using Newtonsoft.Json; /// <summary> /// WeiXin 的摘要說明 /// </summary> public abstract class WeiXinPage : Page, IRequiresSessionState { /// <summary> /// 是否訪客身份 true:是 false:否 /// </summary> public static bool isGuest { get { return HttpContext.Current.Session[_user] == null ? true : false; } } private static string _user { get { return "$wxuser"; } } private static string _code { get { return "$wxcode"; } } private static string _AbsoluteUri { get { return HttpContext.Current.Request.Url.AbsoluteUri; } } /// <summary> /// 該路徑剔除微信Query的URL用於頁面重定向獲取最新的使用者資訊 /// </summary> private static string _RawUrl { get { var url = HttpContext.Current.Request.Url.AbsoluteUri; url = url.Replace(url.Substring(url.IndexOf("code"), url.IndexOf("STATE") + 5 - url.IndexOf("code")), ""); return url; } } /// <summary> /// 微信使用者資訊 /// </summary> public Dictionary<string, object> Data { get { return getWxUser(); } } protected sealed override void OnPreInit(EventArgs e) { if (isGuest) { getWxUser(); } base.OnPreInit(e); } /// <summary> /// 獲取微信使用者資訊 /// </summary> private static Dictionary<string, object> getWxUser() { string code = HttpContext.Current.Request.QueryString.Get("code") ?? "", url = "", ret = ""; try { var user = HttpContext.Current.Session[_user]; if (code.Length == 0 && user == null) { JumpUrl(); return null; } if (user != null) return JsonConvert.DeserializeObject<Dictionary<string, object>>( HttpContext.Current.Session[_user].ToString()); #region /*如果session中不存在user資訊則對接微信介面獲取使用者資訊*/ /* 根據code獲取access_token */ url = string.Format( "https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code" , Config.AppId , Config.AppSecret , code); ret = HttpService.Get(url); var o = JsonConvert.DeserializeObject<Dictionary<string, string>>(ret); #region 注意處理微錯誤{"errcode":40163, "errmsg":"code been used"} 以及{"errcode":40029, "errmsg":"invalid code"} if (o.ContainsKey("errmsg")) { if (o["errcode"] == "40163" || o["errcode"] == "40029") { HttpContext.Current.Response.Redirect(_RawUrl, false); return null; } throw new Exception(o["errmsg"]); } #endregion /* 根據access_token和openid獲取使用者資訊 */ url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN" , o["access_token"] , o["openid"]); ret = HttpService.Get(url); /*儲存使用者到Session*/ HttpContext.Current.Session[_user] = ret; #endregion return JsonConvert.DeserializeObject<Dictionary<string, object>>(HttpContext.Current.Session[_user].ToString()); } catch { throw; } } /// <summary> /// 跳轉至微信授權登入頁 /// </summary> private static void JumpUrl() { var url = string.Format( "https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect" , Config.AppId , _AbsoluteUri); HttpContext.Current.Response.Redirect(url, false); } }
##HttpService.cs
using System; using System.Collections.Specialized; using System.Net; using System.Text; /// <summary> /// HttpService 的摘要說明 /// </summary> public class HttpService { public static string Get(string url) { using (var c = new WebClient()) { try { c.Encoding = Encoding.UTF8; return c.DownloadString(url); } catch (Exception) { throw; } } } public static string GetPost(string url, string parameters) { var ret = ""; using (var c = new WebClient()) { try { c.Encoding = Encoding.UTF8; var data = Encoding.UTF8.GetBytes(parameters); c.Headers.Add("Content-Type", "application/x-www-form-urlencoded"); c.Headers.Add("ContentLength", parameters.Length.ToString()); ret = Encoding.UTF8.GetString(c.UploadData(url, "POST", data)); return ret; } catch (Exception) { throw; } } } public static string GetPost(string url, NameValueCollection nv) { using (var c = new WebClient()) { try { c.Encoding = Encoding.UTF8; return Encoding.UTF8.GetString(c.UploadValues(url, "POST", nv)); } catch (Exception) { throw; } } } }
##Config.cs
using System.Collections.Generic;
using System.Net;
using System.Text;
using System.Web;
using System.Web.SessionState;
using Newtonsoft.Json;
/// <summary>
/// 微信公眾號配置檔案
/// </summary>
public class Config : IRequiresSessionState
{
/// <summary>
/// 開發者ID
/// </summary>
public static string AppId { get; set; }
/// <summary>
/// 開發者密碼
/// </summary>
public static string AppSecret { get; set; }
/// <summary>
/// APP access_token 7200秒更新一次
/// </summary>
public static string access_token
{
get
{
try
{
if (HttpContext.Current.Session["$access_token"] == null)
{
using (var wc = new WebClient())
{
wc.Encoding = Encoding.UTF8;
var ret =
wc.DownloadString(
string.Format(
"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",
AppId, AppSecret));
var o = JsonConvert.DeserializeObject<Dictionary<string, object>>(ret);
if (o.ContainsKey("errmsg")) return o["errmsg"].ToString();
HttpContext.Current.Session.Add("$access_token", o["access_token"].ToString());
HttpContext.Current.Session.Timeout = 7200;
return o["access_token"].ToString();
}
}
return HttpContext.Current.Session["$access_token"].ToString();
}
catch
{
throw;
}
}
}
}
##Global.asax
<%@ Application Language="C#" %>
<script RunAt="server">
private void Application_Start(object sender, EventArgs e)
{
// 在應用程式啟動時執行的程式碼
Config.AppId = "wx*********aaaa";
Config.AppSecret = "5454564564646546465456";
}
private void Application_End(object sender, EventArgs e)
{
// 在應用程式關閉時執行的程式碼
}
private void Application_Error(object sender, EventArgs e)
{
// 在出現未處理的錯誤時執行的程式碼
}
private void Session_Start(object sender, EventArgs e)
{
// 在新會話啟動時執行的程式碼
}
private void Session_End(object sender, EventArgs e)
{
// 在會話結束時執行的程式碼。
// 注意: 只有在 Web.config 檔案中的 sessionstate 模式設定為
// InProc 時，才會引發 Session_End 事件。如果會話模式設定為 StateServer
// 或 SQLServer，則不引發該事件。
}
</script>