.NET微信公众号获取OpenID和用户信息

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本文实例为大家分享了微信公众平台实现获取用户OpenID的方法，供大家参考，具体内容如下

Index.aspx.cs代码:

 public partial class Index : System.Web.UI.Page
 {

  //用户id
  public string openid = "";

  //公众号信息部分
  public string appid = ConfigurationManager.AppSettings["AppId"];
  public string appsecret = ConfigurationManager.AppSettings["AppSecret"];
  public string redirect_uri =HttpUtility.UrlEncode("https://www.jb51.net");
  public string scope = "【删除这个并填入请求类型，例如：snsapi_userinfo】";

  #region 显示页面
  public string accesstoken;
  public string nickname;
  public string sex;
  public string headimgurl;
  public string province;
  public string country;
  public string language;
  public string city;

  public string privilege = "";
  #endregion

  protected void Page_Load(object sender, EventArgs e)
  {

   /*
   *微信认证获取openid部分：
   *临时认证code
   */
   //微信认证部分：第二步 获得code
   string code = Request["code"];
   if (string.IsNullOrEmpty(code))
   {
    //如果code没获取成功，重新拉取一遍
    OpenAccess();
   }
   //微信认证部分：第三步 获得openid
   string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, appsecret, code);
   string result = HttpClientHelper.GetResponse(url);
   LogHelper.WriteFile(result);
   JObject outputObj = JObject.Parse(result);

   //微信认证部分：第四步 获得更多信息
   accesstoken = outputObj["access_token"].ToString();
   openid = outputObj["openid"].ToString();
   url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN",accesstoken,openid);
   string result1 = HttpClientHelper.GetResponse(url);
   LogHelper.WriteFile(result1);
   JObject outputObj1 = JObject.Parse(result1);//将json转为数组
   //以下是第四步获得的信息：  
    nickname = outputObj1["nickname"].ToString(); //昵称
    sex = outputObj1["sex"].ToString(); //性别什么的
    headimgurl = outputObj1["headimgurl"].ToString(); //头像url
    province = outputObj1["province"].ToString(); ;
    country = outputObj1["country"].ToString(); ;
    language = outputObj1["language"].ToString(); ;
    city = outputObj1["city"].ToString(); ;
   //将获得的用户信息填入到session中
   Session["openid"] = outputObj1["openid"];
   //转向回入口
   //OpenAccess();
  }

  /*
   * 接入入口
   * 开放到微信菜单中调用
   * @param $dir_url 来源url
   * @since 1.0
   * @return void
   */
  public void OpenAccess()
  {
   //判断session不存在
   if (Session["openid"] == null)
   {
    //认证第一步：重定向跳转至认证网址
    string url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&&response_type=code&scope=snsapi_userinfo&m=oauth2#wechat_redirect", appid, redirect_uri);
    Response.Redirect(url);
   }
   //判断session存在
   else
   {
    //跳转到前端页面.aspx
    Response.Redirect(Request.Url.ToString());
   }
  }

 }

Index.aspx内容:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="TEST.Index" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <title></title>
 <meta name="viewport" content="width=device-width, initial-scale=1" />
 <style type="text/css">
  td
  {
   word-wrap: break-word;
  }
 </style>
 <script type="text/javascript">

 </script>
</head>
<body>
 <form id="form1" runat="server">
 <div id="wu" runat="server">
  <table style="width: 100%;">
   <tr>
    <td style="width: 150px;">
     <p>
      openid:<%=openid%></p>
    </td>
    <td>
     <p>
      nickname:<%=nickname%></p>
    </td>
    <td>
     <p>
      sex:<%=sex%></p>
    </td>
   </tr>
   <tr>
    <td>
     <p>
      language:<%=language%></p>
    </td>
    <td>
     <p>
      city:<%=city%></p>
    </td>
    <td>
     <p>
      country:<%=country%></p>
    </td>
   </tr>
   <tr>
    <td>
     <p>
      headimgurl:<img width="50px;" src="<%=headimgurl %>" alt=""></p>
    </td>
    <td>
     <p>
      privilege:<%=privilege%></p>
    </td>
    <td>
    </td>
   </tr>
  </table>
 </div>
 </form>
</body>
</html>

HttpClientHelper.cs代码:

public class HttpClientHelper
 {
  /// <summary>
  ///  get请求
  /// </summary>
  /// <param name="url"></param>
  /// <returns></returns>
  public static string GetResponse(string url)
  {
   if (url.StartsWith("https"))
   {
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
   }

   var httpClient = new HttpClient();
   httpClient.DefaultRequestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json"));

   HttpResponseMessage response = httpClient.GetAsync(url).Result;

   if (response.IsSuccessStatusCode)
   {
    string result = response.Content.ReadAsStringAsync().Result;
    return result;
   }
   return null;
  }

  public static T GetResponse<T>(string url)
   where T : class, new()
  {
   if (url.StartsWith("https"))
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

   var httpClient = new HttpClient();
   httpClient.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));
   HttpResponseMessage response = httpClient.GetAsync(url).Result;

   T result = default(T);

   if (response.IsSuccessStatusCode)
   {
    Task<string> t = response.Content.ReadAsStringAsync();
    string s = t.Result;

    result = JsonConvert.DeserializeObject<T>(s);
   }
   return result;
  }

  /// <summary>
  ///  post请求
  /// </summary>
  /// <param name="url"></param>
  /// <param name="postData">post数据</param>
  /// <returns></returns>
  public static string PostResponse(string url, string postData)
  {
   if (url.StartsWith("https"))
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

   HttpContent httpContent = new StringContent(postData);
   httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
   var httpClient = new HttpClient();

   HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

   if (response.IsSuccessStatusCode)
   {
    string result = response.Content.ReadAsStringAsync().Result;
    return result;
   }
   return null;
  }

  /// <summary>
  ///  发起post请求
  /// </summary>
  /// <typeparam name="T"></typeparam>
  /// <param name="url">url</param>
  /// <param name="postData">post数据</param>
  /// <returns></returns>
  public static T PostResponse<T>(string url, string postData)
   where T : class, new()
  {
   if (url.StartsWith("https"))
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

   HttpContent httpContent = new StringContent(postData);
   httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
   var httpClient = new HttpClient();

   T result = default(T);

   HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

   if (response.IsSuccessStatusCode)
   {
    Task<string> t = response.Content.ReadAsStringAsync();
    string s = t.Result;

    result = JsonConvert.DeserializeObject<T>(s);
   }
   return result;
  }

  /// <summary>
  ///  V3接口全部为Xml形式，故有此方法
  /// </summary>
  /// <typeparam name="T"></typeparam>
  /// <param name="url"></param>
  /// <param name="xmlString"></param>
  /// <returns></returns>
  public static T PostXmlResponse<T>(string url, string xmlString)
   where T : class, new()
  {
   if (url.StartsWith("https"))
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

   HttpContent httpContent = new StringContent(xmlString);
   httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
   var httpClient = new HttpClient();

   T result = default(T);

   HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

   if (response.IsSuccessStatusCode)
   {
    Task<string> t = response.Content.ReadAsStringAsync();
    string s = t.Result;

    result = XmlDeserialize<T>(s);
   }
   return result;
  }

  /// <summary>
  ///  反序列化Xml
  /// </summary>
  /// <typeparam name="T"></typeparam>
  /// <param name="xmlString"></param>
  /// <returns></returns>
  public static T XmlDeserialize<T>(string xmlString)
   where T : class, new()
  {
   try
   {
    var ser = new XmlSerializer(typeof (T));
    using (var reader = new StringReader(xmlString))
    {
     return (T) ser.Deserialize(reader);
    }
   }
   catch (Exception ex)
   {
    throw new Exception("XmlDeserialize发生异常：xmlString:" + xmlString + "异常信息：" + ex.Message);
   }
  }
 }

结果如图：