1、首先在某微信平臺下配置OAuth2.0授權回調頁面：

2、通過appid構造url獲取微信回傳code值(appid可在微信平臺下找到)

1)、微信不彈出授權頁面url：

A、code回傳到頁面wxProcess2.aspx，不帶參數

[csharp]?view plaincopy

Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid="?+?appid?+?"&redirect_uri=http://localhost:8888/wxProcess2.aspx&response_type=code&scope=snsapi_base&state=1#wechat_redirect");????

B、code回傳到頁面wxProcess2.aspx，帶參數reurl，即wxProcess2.aspx獲得code的同時，也能獲取reurl的值，具體如下：

[csharp]?view plaincopy

Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid="?+?appid?+?"&redirect_uri=http://localhost:8888/wxProcess2.aspx?reurl="?+?reurl?+?"&response_type=code&scope=snsapi_base&state=1#wechat_redirect");??

2)、微信彈出授權頁面url：需要用戶授權，才能獲取code及后面需要獲取的用戶信息

[csharp]?view plaincopy

Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid="?+?appid?+?"&redirect_uri=http://localhost:8888/wxProcess2.aspx?reurl="?+?reurl?+?"&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect");??

說明：微信是否彈出授權頁面url的區別只在一個參數scope，不彈出微信授權頁面：scope=snsapi_base，彈出微信授權頁面：scope=snsapi_userinfo。

微信授權頁面如下：

3、通過appid、secret、code構造url，獲取微信用戶的openid和access token。appid、secret可在微信平臺下找到，code已在上面方法中獲取并回傳。具體訪問url：

[csharp]?view plaincopy

https://api.weixin.qq.com/sns/oauth2/access_token?appid="?+?appid?+?"&secret="?+?appsecret?+?"&code="?+?Code?+?"&grant_type=authorization_code??

4、通過openid、access token獲取用戶信息，具體訪問url：

[csharp]?view plaincopy

https://api.weixin.qq.com/sns/userinfo?access_token="?+?REFRESH_TOKEN?+?"&openid="?+?OPENID??

說明：主要通過訪問微信的3個url地址并回傳數據，獲取微信用戶基本信息

=================================================================================================================================

具體代碼：

1、獲取微信code處理頁面：wxProcess.aspx

[csharp]?view plaincopy

protected?void?Page_Load(object?sender,?EventArgs?e)??

????{??

????????if?(!IsPostBack)??

????????{??

????????????string?reurl?=?"";??

????????????//傳遞參數，獲取用戶信息后，可跳轉到自己定義的頁面，想怎么處理就怎么處理??

????????????if?(Request.QueryString["reurl"]?!=?null?&&?Request.QueryString["reurl"]?!=?"")??

????????????{??

????????????????reurl?=?Request.QueryString["reurl"].ToString();??

????????????}??

????????????else??

????????????{??

????????????????reurl?=?"http://www.csdn.net";??

????????????}??

????????????string?code?=?"";??

????????????//彈出授權頁面(如在不彈出授權頁面基礎下未獲得openid，則彈出授權頁面，提示用戶授權)??

????????????if?(Request.QueryString["auth"]?!=?null?&&?Request.QueryString["auth"]?!=?""?&&?Request.QueryString["auth"]?==?"1")??

????????????{??

????????????????Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid="?+?appid?+?"&redirect_uri=http://localhost:8888/wxProcess2.aspx?reurl="?+?reurl?+?"&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect");??

????????????}??

????????????else??

????????????{??

????????????????//不彈出授權頁面??

????????????????Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid="?+?appid?+?"&redirect_uri=http://localhost:8888/wxProcess2.aspx?reurl="?+?reurl?+?"&response_type=code&scope=snsapi_base&state=1#wechat_redirect");????????????}??

????????}??

????}??

2、獲取微信code值回傳到自己的頁面wxProcess2.aspx：

[csharp]?view plaincopy

public?string?reurl?=?"";??

????protected?void?Page_Load(object?sender,?EventArgs?e)??

????{??

????????if?(!IsPostBack)??

????????{??

????????????//獲取從wxProcess.aspx傳遞過來的跳轉地址reurl??

????????????if?(Request.QueryString["reurl"]?!=?null?&&?Request.QueryString["reurl"]?!=?"")??

????????????{??

????????????????reurl?=?Request.QueryString["reurl"].ToString();??

????????????}??

????????????string?code?=?"";??

????????????if?(Request.QueryString["code"]?!=?null?&&?Request.QueryString["code"]?!=?"")??

????????????{??

????????????????//獲取微信回傳的code??

????????????????code?=?Request.QueryString["code"].ToString();?????

????????????????OAuth_Token?Model?=?Get_token(code);??//獲取token??

????????????????OAuthUser?OAuthUser_Model?=?Get_UserInfo(Model.access_token,?Model.openid?);??

????????????????if(OAuthUser_Model.openid!=null?&&?OAuthUser_Model.openid?!="")??//已獲取得openid及其他信息??

????????????????{??

????????????????????//在頁面上輸出用戶信息??

????????????????????Response.Write("用戶OPENID:"?+?OAuthUser_Model.openid?+?"<br>用戶昵稱:"?+?OAuthUser_Model.nickname?+?"<br>性別:"?+?OAuthUser_Model.sex?+?"<br>所在省:"?+?OAuthUser_Model.province?+?"<br>所在市:"?+?OAuthUser_Model.city?+?"<br>所在國家:"?+?OAuthUser_Model.country?+?"<br>頭像地址:"?+?OAuthUser_Model.headimgurl?+?"<br>用戶特權信息:"?+?OAuthUser_Model.privilege);??

????????????????????//或跳轉到自己的頁面，想怎么處理就怎么處理??

????????????????????Response.Redirect(reurl);??

????????????????}??

????????????????else??//未獲得openid，回到wxProcess.aspx，訪問彈出微信授權頁面??

????????????????{??

????????????????????Response.Redirect("wxProcess.aspx?auth=1");??

????????????????}??

????????????}??

????????}??

????}??

??

????#region?屬性??

????public?string?appid?=?"wx6669e231bffa123f";??//公眾微信平臺下可以找到??

????public?string?appsecret?=?"9d693f7a81236c123464281115p78445";??//公眾微信平臺下可以找到??

????#endregion??

???

?//根據appid，secret，code獲取微信openid、access?token信息??

????protected?OAuth_Token?Get_token(string?Code)??

????{??

????????//獲取微信回傳的openid、access?token??

????????string?Str?=?GetJson("https://api.weixin.qq.com/sns/oauth2/access_token?appid="?+?appid?+?"&secret="?+?appsecret?+?"&code="?+?Code?+?"&grant_type=authorization_code");??

????????//微信回傳的數據為Json格式，將Json格式轉化成對象??

????????OAuth_Token?Oauth_Token_Model?=?JsonHelper.ParseFromJson<OAuth_Token>(Str);??

????????return?Oauth_Token_Model;??

????}??

????//刷新Token(好像這個刷新Token沒有實際作用)??

????protected?OAuth_Token?refresh_token(string?REFRESH_TOKEN)??

????{??

????????string?Str?=?GetJson("https://api.weixin.qq.com/sns/oauth2/refresh_token?appid="?+?appid?+?"&grant_type=refresh_token&refresh_token="?+?REFRESH_TOKEN);??

????????OAuth_Token?Oauth_Token_Model?=?JsonHelper.ParseFromJson<OAuth_Token>(Str);??

????????return?Oauth_Token_Model;??

????}??

????//根據openid，access?token獲得用戶信息??

????protected?OAuthUser?Get_UserInfo(string?REFRESH_TOKEN,?string?OPENID)??

????{??

????????string?Str?=?GetJson("https://api.weixin.qq.com/sns/userinfo?access_token="?+?REFRESH_TOKEN?+?"&openid="?+?OPENID);??

????????OAuthUser?OAuthUser_Model?=?JsonHelper.ParseFromJson<OAuthUser>(Str);??

????????return?OAuthUser_Model;??

????}??

????//訪問微信url并返回微信信息??

????protected?string?GetJson(string?url)??

????{??

????????WebClient?wc?=?new?WebClient();??

????????wc.Credentials?=?CredentialCache.DefaultCredentials;??

????????wc.Encoding?=?Encoding.UTF8;??

????????string?returnText?=?wc.DownloadString(url);??

????????if?(returnText.Contains("errcode"))??

????????{??

????????????//可能發生錯誤??

????????}??

????????return?returnText;??

????}??

??

????///?<summary>??

????///?token類??

????///?</summary>??

????public?class?OAuth_Token??

????{??

????????public?OAuth_Token()??

????????{??

????????????//??

????????????//TODO:?在此處添加構造函數邏輯??

????????????//??

????????}??

????????//access_token?網頁授權接口調用憑證,注意：此access_token與基礎支持的access_token不同??

????????//expires_in?access_token接口調用憑證超時時間，單位(秒)??

????????//refresh_token?用戶刷新access_token??

????????//openid?用戶唯一標識，請注意，在未關注公眾號時，用戶訪問公眾號的網頁，也會產生一個用戶和公眾號唯一的OpenID??

????????//scope?用戶授權的作用域，使用逗號(,)分隔??

????????public?string?_access_token;??

????????public?string?_expires_in;??

????????public?string?_refresh_token;??

????????public?string?_openid;??

????????public?string?_scope;??

????????public?string?access_token??

????????{??

????????????set?{?_access_token?=?value;?}??

????????????get?{?return?_access_token;?}??

????????}??

????????public?string?expires_in??

????????{??

????????????set?{?_expires_in?=?value;?}??

????????????get?{?return?_expires_in;?}??

????????}??

????????public?string?refresh_token??

????????{??

????????????set?{?_refresh_token?=?value;?}??

????????????get?{?return?_refresh_token;?}??

????????}??

????????public?string?openid??

????????{??

????????????set?{?_openid?=?value;?}??

????????????get?{?return?_openid;?}??

????????}??

????????public?string?scope??

????????{??

????????????set?{?_scope?=?value;?}??

????????????get?{?return?_scope;?}??

????????}??

????}??

????///?<summary>??

????///?用戶信息類??

????///?</summary>??

????public?class?OAuthUser??

????{??

????????public?OAuthUser()??

????????{?}??

????????#region?數據庫字段??

????????private?string?_openID;??

????????private?string?_searchText;??

????????private?string?_nickname;??

????????private?string?_sex;??

????????private?string?_province;??

????????private?string?_city;??

????????private?string?_country;??

????????private?string?_headimgUrl;??

????????private?string?_privilege;??

????????#endregion??

????????#region?字段屬性??

????????///?<summary>??

????????///?用戶的唯一標識??

????????///?</summary>??

????????public?string?openid??

????????{??

????????????set?{?_openID?=?value;?}??

????????????get?{?return?_openID;?}??

????????}??

????????///?<summary>??

????????///???

????????///?</summary>??

????????public?string?SearchText??

????????{??

????????????set?{?_searchText?=?value;?}??

????????????get?{?return?_searchText;?}??

????????}??

????????///?<summary>??

????????///?用戶昵稱???

????????///?</summary>??

????????public?string?nickname??

????????{??

????????????set?{?_nickname?=?value;?}??

????????????get?{?return?_nickname;?}??

????????}??

????????///?<summary>??

????????///?用戶的性別，值為1時是男性，值為2時是女性，值為0時是未知???

????????///?</summary>??

????????public?string?sex??

????????{??

????????????set?{?_sex?=?value;?}??

????????????get?{?return?_sex;?}??

????????}??

????????///?<summary>??

????????///?用戶個人資料填寫的省份??

????????///?</summary>??

????????public?string?province??

????????{??

????????????set?{?_province?=?value;?}??

????????????get?{?return?_province;?}??

????????}??

????????///?<summary>??

????????///?普通用戶個人資料填寫的城市???

????????///?</summary>??

????????public?string?city??

????????{??

????????????set?{?_city?=?value;?}??

????????????get?{?return?_city;?}??

????????}??

????????///?<summary>??

????????///?國家，如中國為CN???

????????///?</summary>??

????????public?string?country??

????????{??

????????????set?{?_country?=?value;?}??

????????????get?{?return?_country;?}??

????????}??

????????///?<summary>??

????????///?用戶頭像，最后一個數值代表正方形頭像大小(有0、46、64、96、132數值可選，0代表640*640正方形頭像)，用戶沒有頭像時該項為空??

????????///?</summary>??

????????public?string?headimgurl??

????????{??

????????????set?{?_headimgUrl?=?value;?}??

????????????get?{?return?_headimgUrl;?}??

????????}??

????????///?<summary>??

????????///?用戶特權信息，json?數組，如微信沃卡用戶為(chinaunicom)其實這個格式稱不上JSON，只是個單純數組??

????????///?</summary>??

????????public?string?privilege??

????????{??

????????????set?{?_privilege?=?value;?}??

????????????get?{?return?_privilege;?}??

????????}??

????????#endregion??

????}??

????///?<summary>??

????///?將Json格式數據轉化成對象??

????///?</summary>??

????public?class?JsonHelper??

????{??

????????///?<summary>????

????????///?生成Json格式????

????????///?</summary>????

????????///?<typeparam?name="T"></typeparam>????

????????///?<param?name="obj"></param>????

????????///?<returns></returns>????

????????public?static?string?GetJson<T>(T?obj)??

????????{??

????????????DataContractJsonSerializer?json?=?new?DataContractJsonSerializer(obj.GetType());??

????????????using?(MemoryStream?stream?=?new?MemoryStream())??

????????????{??

????????????????json.WriteObject(stream,?obj);??

????????????????string?szJson?=?Encoding.UTF8.GetString(stream.ToArray());?return?szJson;??

????????????}??

????????}??

????????///?<summary>????

????????///?獲取Json的Model????

????????///?</summary>????

????????///?<typeparam?name="T"></typeparam>????

????????///?<param?name="szJson"></param>????

????????///?<returns></returns>????

????????public?static?T?ParseFromJson<T>(string?szJson)??

????????{??

????????????T?obj?=?Activator.CreateInstance<T>();??

????????????using?(MemoryStream?ms?=?new?MemoryStream(Encoding.UTF8.GetBytes(szJson)))??

????????????{??

????????????????DataContractJsonSerializer?serializer?=?new?DataContractJsonSerializer(obj.GetType());??

????????????????return?(T)serializer.ReadObject(ms);??

????????????}??

????????}??

????}??

?輸出微信用戶信息：

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