最近開發微信公眾平臺，做下記錄，以前也開發過，這次開發又給忘了，搞了半天，還是做個筆記為好。
注意框架為MVC 開發微信公眾平臺。場景為，在模板頁中獲取用戶openid，想要進行驗證的頁面，集成模板頁就可以了。
在_Layout.cshtml中加入如下代碼
<head> <meta charset="utf-8" /> <meta name="viewport" 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> 類AdminUtil中加入GetOpenID方法
#region 獲取OpenID /// <summary> /// 獲取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 類WXApi中加入GetOpenID方法
#region 獲取OpenId /// <summary> /// 獲取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"); } #endregionpublic static class WXModel { public static string access_token; public static string AppID; public static string AppSecret; } /// <summary> /// 工具類 /// </summary> public class Tools { #region 獲取Json字符串某節點的值 /// <summary> /// 獲取Json字符串某節點的值 /// </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) { //先截逗號，若是最后一個，截“｝”號，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[] { '"', ' ', '/'' }); //過濾引號或空格 } } return result; } #endregion }
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