最近开发微信公众平台，做下记录，以前也开发过，这次开发又给忘了，搞了半天，还是做个笔记为好。
注意框架为MVC 开发微信公众平台。场景为，在模板页中获取用户openid，想要进行验证的页面，集成模板页就可以了。
在_Layout.cshtml中加入如下代码
<head> <meta charset="utf-8" /> <meta content="width=device-width, initial-scale=1.0"> <title>@ViewBag.Title - My ASP.NET Application</title> @Styles.Render("~/Content/css") @Scripts.Render("~/bundles/modernizr") @{ var code = HttpContext.Current.Request["code"]; Log.logmsg(code); string urlpath = HttpContext.Current.Request.Url.AbsoluteUri.ToString(); ViewBag.at = AdminUtil.GetOpenID(urlpath, code); } </head>
类AdminUtil中加入GetOpenID方法
#region 获取OpenID /// <summary> /// 获取OpenID /// </summary> public static string GetOpenID(string redirect_url, string code) { string AppID = WXModel.AppID; string AppSecret = WXModel.AppSecret; string openid = ""; openid = WXApi.GetOpenID(AppID, redirect_url, code, AppSecret); return openid; } #endregion
类WXApi中加入GetOpenID方法
#region 获取OpenId /// <summary> /// 获取OpenId /// </summary> public static string GetOpenID(string appid, string redirect_url, string code, string screct) { string strJson = ""; if (string.IsNullOrEmpty(code)) { redirect_url = HttpUtility.UrlEncode(redirect_url); HttpContext.Current.Response.Redirect(string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state={2}#wechat_redirect", appid, redirect_url, new Random().Next(1000, 200000).ToString())); } else { strJson = HttpRequestUtil.RequestUrl(string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, screct, code)); } return Tools.GetJsonValue(strJson, "openid"); } #endregion
public static class WXModel { public static string access_token; public static string AppID; public static string AppSecret; }
/// <summary> /// 工具类 /// </summary> public class Tools { #region 获取Json字符串某节点的值 /// <summary> /// 获取Json字符串某节点的值 /// </summary> public static string GetJsonValue(string jsonStr, string key) { string result = string.Empty; if (!string.IsNullOrEmpty(jsonStr)) { key = "\"" + key.Trim('"') + "\""; int index = jsonStr.IndexOf(key) + key.Length + 1; if (index > key.Length + 1) { //先截逗号，若是最后一个，截“｝”号，取最小值 int end = jsonStr.IndexOf(',', index); if (end == -1) { end = jsonStr.IndexOf('}', index); } result = jsonStr.Substring(index, end - index); result = result.Trim(new char[] { '"', ' ', '\'' }); //过滤引号或空格 } } return result; } #endregion }
public class HttpRequestUtil { #region 请求Url，不发送数据 /// <summary> /// 请求Url，不发送数据 /// </summary> public static string RequestUrl(string url) { return RequestUrl(url, "POST"); } #endregion #region 请求Url，不发送数据 /// <summary> /// 请求Url，不发送数据 /// </summary> public static string RequestUrl(string url, string method) { // 设置参数 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; CookieContainer cookieContainer = new CookieContainer(); request.CookieContainer = cookieContainer; request.AllowAutoRedirect = true; request.Method = method; request.ContentType = "text/html"; request.Headers.Add("charset", "utf-8"); //发送请求并获取相应回应数据 HttpWebResponse response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求 Stream responseStream = response.GetResponseStream(); StreamReader sr = new StreamReader(responseStream, Encoding.Default); //返回结果网页（html）代码 string content = sr.ReadToEnd(); return content; } #endregion }
注意：需要在微信公众平台中设置授权回调域
