MVC微信网页授权获取用户OpenId
时间：2021-12-28 10:43:31|栏目：.NET代码|点击： 次
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 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>
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
