不管是騰訊還是新浪，查看他們的API，PHP都是有完整的接口，但對C#支持似乎都不是那么完善，都沒有，騰訊是完全沒有，新浪是提供第三方的，而且后期還不一定升級，NND，用第三方的動輒就一個類庫，各種配置還必須按照他們約定的寫，煩而且亂，索性自己寫，后期的擴展也容易，看過接口后，開始以為很難，參考了幾個源碼之后發現也不是那么難，無非是GET或POST請求他們的接口獲取返回值之類的，話不多說，這里只提供幾個代碼共參考，拋磚引玉了。。。
我這個寫法的特點是，用到了Session，使用對象實例化之后調用 Login() 跳轉到登錄頁面，在回調頁面調用Callback() 執行之后，可以從Session也可以寫獨立的函數（如：GetOpenID()）中獲取access_token或用戶的唯一標識，以方便做下一步的操作。所謂綁定就是把用戶的唯一標識取出，插入數據庫，和帳號綁定起來。
1.首先是所有OAuth類的基類，放一些需要公用的方法
public abstract class BaseOAuth{ public HttpRequest Request = HttpContext.Current.Request; public HttpResponse Response = HttpContext.Current.Response; public HttpSessionState Session = HttpContext.Current.Session; public abstract void Login(); public abstract string Callback(); #region 內部使用函數 /// <summary> /// 生成唯一隨機串防CSRF攻擊 /// </summary> /// <returns></returns> protected string GetStateCode() { Random rand = new Random(); string data = DateTime.Now.ToString("yyyyMMddHHmmssffff") + rand.Next(1, 0xf423f).ToString(); MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); byte[] md5byte = md5.ComputeHash(UTF8Encoding.Default.GetBytes(data)); return BitConverter.ToString(md5byte).Replace("-", ""); } /// <summary> /// GET請求 /// </summary> /// <param name="url"></param> /// <returns></returns> protected string GetRequest(string url) { HttpWebRequest httpWebRequest = System.Net.WebRequest.Create(url) as HttpWebRequest; httpWebRequest.Method = "GET"; httpWebRequest.ServicePoint.Expect100Continue = false; StreamReader responseReader = null; string responseData; try { responseReader = new StreamReader(httpWebRequest.GetResponse().GetResponseStream()); responseData = responseReader.ReadToEnd(); } finally { httpWebRequest.GetResponse().GetResponseStream().Close(); responseReader.Close(); } return responseData; } /// <summary> /// POST請求 /// </summary> /// <param name="url"></param> /// <param name="postData"></param> /// <returns></returns> protected string PostRequest(string url, string postData) { HttpWebRequest httpWebRequest = System.Net.WebRequest.Create(url) as HttpWebRequest; httpWebRequest.Method = "POST"; httpWebRequest.ServicePoint.Expect100Continue = false; httpWebRequest.ContentType = "application/x-www-form-urlencoded"; //寫入POST參數 StreamWriter requestWriter = new StreamWriter(httpWebRequest.GetRequestStream()); try { requestWriter.Write(postData); } finally { requestWriter.Close(); } //讀取請求后的結果 StreamReader responseReader = null; string responseData; try { responseReader = new StreamReader(httpWebRequest.GetResponse().GetResponseStream()); responseData = responseReader.ReadToEnd(); } finally { httpWebRequest.GetResponse().GetResponseStream().Close(); responseReader.Close(); } return responseData; } /// <summary> /// 解析JSON /// </summary> /// <param name="strJson"></param> /// <returns></returns> protected NameValueCollection ParseJson(string strJson) { NameValueCollection mc = new NameValueCollection(); Regex regex = new Regex(@"(/s*/""?([^""]*)/""?/s*/:/s*/""?([^""]*)/""?/,?)"); strJson = strJson.Trim(); if (strJson.StartsWith("{")) { strJson = strJson.Substring(1, strJson.Length - 2); } foreach (Match m in regex.Matches(strJson)) { mc.Add(m.Groups[2].Value, m.Groups[3].Value); } return mc; } /// <summary> /// 解析URL /// </summary> /// <param name="strParams"></param> /// <returns></returns> protected NameValueCollection ParseUrlParameters(string strParams) { NameValueCollection nc = new NameValueCollection(); foreach (string p in strParams.Split('&')) { string[] ps = p.Split('='); nc.Add(ps[0], ps[1]); } return nc; } #endregion} 2.QQ的OAuth類
public class QQOAuth : BaseOAuth{ public string AppId = ConfigurationManager.AppSettings["OAuth_QQ_AppId"]; public string AppKey = ConfigurationManager.AppSettings["OAuth_QQ_AppKey"]; public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_QQ_RedirectUrl"]; public const string GET_AUTH_CODE_URL = "https://graph.qq.com/oauth2.0/authorize"; public const string GET_ACCESS_TOKEN_URL = "https://graph.qq.com/oauth2.0/token"; public const string GET_OPENID_URL = "https://graph.qq.com/oauth2.0/me"; /// <summary> /// QQ登錄，跳轉到登錄頁面 /// </summary> public override void Login() { //-------生成唯一隨機串防CSRF攻擊 string state = GetStateCode(); Session["QC_State"] = state; //state 放入Session string parms = "?response_type=code&" + "client_id=" + AppId + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&state=" + state; string url = GET_AUTH_CODE_URL + parms; Response.Redirect(url); //跳轉到登錄頁面 } /// <summary> /// QQ回調函數 /// </summary> /// <param name="code"></param> /// <param name="state"></param> /// <returns></returns> public override string Callback() { string code = Request.QueryString["code"]; string state = Request.QueryString["state"]; //--------驗證state防止CSRF攻擊 if (state != (string)Session["QC_State"]) { ShowError("30001"); } string parms = "?grant_type=authorization_code&" + "client_id=" + AppId + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&client_secret=" + AppKey + "&code=" + code; string url = GET_ACCESS_TOKEN_URL + parms; string str = GetRequest(url); if (str.IndexOf("callback") != -1) { int lpos = str.IndexOf("("); int rpos = str.IndexOf(")"); str = str.Substring(lpos + 1, rpos - lpos - 1); NameValueCollection msg = ParseJson(str); if (!string.IsNullOrEmpty(msg["error"])) { ShowError(msg["error"], msg["error_description"]); } } NameValueCollection token = ParseUrlParameters(str); Session["QC_AccessToken"] = token["access_token"]; //access_token 放入Session return token["access_token"]; } /// <summary> /// 使用Access Token來獲取用戶的OpenID /// </summary> /// <param name="accessToken"></param> /// <returns></returns> public string GetOpenID() { string parms = "?access_token=" + Session["QC_AccessToken"]; string url = GET_OPENID_URL + parms; string str = GetRequest(url); if (str.IndexOf("callback") != -1) { int lpos = str.IndexOf("("); int rpos = str.IndexOf(")"); str = str.Substring(lpos + 1, rpos - lpos - 1); } NameValueCollection user = ParseJson(str); if (!string.IsNullOrEmpty(user["error"])) { ShowError(user["error"], user["error_description"]); } Session["QC_OpenId"] = user["openid"]; //openid 放入Session return user["openid"]; } /// <summary> /// 顯示錯誤信息 /// </summary> /// <param name="code">錯誤編號</param> /// <param name="description">錯誤描述</param> private void ShowError(string code, string description = null) { if (description == null) { switch (code) { case "20001": description = "<h2>配置文件損壞或無法讀取，請檢查web.config</h2>"; break; case "30001": description = "<h2>The state does not match. You may be a victim of CSRF.</h2>"; break; case "50001": description = "<h2>可能是服務器無法請求https協議</h2>可能未開啟curl支持,請嘗試開啟curl支持，重啟web服務器，如果問題仍未解決，請聯系我們"; break; default: description = "<h2>系統未知錯誤，請聯系我們</h2>"; break; } Response.Write(description); Response.End(); } else { Response.Write("<h3>error:<h3>" + code + "<h3>msg:<h3>" + description); Response.End(); } }} 3.新浪微博的OAuth類
public class SinaOAuth : BaseOAuth{ public string AppKey = ConfigurationManager.AppSettings["OAuth_Sina_AppKey"]; public string AppSecret = ConfigurationManager.AppSettings["OAuth_Sina_AppSecret"]; public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_Sina_RedirectUrl"]; public const string GET_AUTH_CODE_URL = "https://api.weibo.com/oauth2/authorize"; public const string GET_ACCESS_TOKEN_URL = "https://api.weibo.com/oauth2/access_token"; public const string GET_UID_URL = "https://api.weibo.com/2/account/get_uid.json"; /// <summary> /// 新浪微博登錄，跳轉到登錄頁面 /// </summary> public override void Login() { //-------生成唯一隨機串防CSRF攻擊 string state = GetStateCode(); Session["Sina_State"] = state; //state 放入Session string parms = "?client_id=" + AppKey + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&state=" + state; string url = GET_AUTH_CODE_URL + parms; Response.Redirect(url); //跳轉到登錄頁面 } /// <summary> /// 新浪微博回調函數 /// </summary> /// <returns></returns> public override string Callback() { string code = Request.QueryString["code"]; string state = Request.QueryString["state"]; //--------驗證state防止CSRF攻擊 if (state != (string)Session["Sina_State"]) { ShowError("The state does not match. You may be a victim of CSRF."); } string parms = "client_id=" + AppKey + "&client_secret=" + AppSecret + "&grant_type=authorization_code&code=" + code + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl); string str = PostRequest(GET_ACCESS_TOKEN_URL, parms); NameValueCollection user = ParseJson(str); Session["Sina_AccessToken"] = user["access_token"]; //access_token 放入Session Session["Sina_UId"] = user["uid"]; //uid 放入Session return user["access_token"]; } /// <summary> /// 顯示錯誤信息 /// </summary> /// <param name="description">錯誤描述</param> private void ShowError(string description = null) { Response.Write("<h2>" + description + "</h2>"); Response.End(); }} 4.微信的OAuth類
public class WeixinOAuth : BaseOAuth{ public string AppId = ConfigurationManager.AppSettings["OAuth_Weixin_AppId"]; public string AppSecret = ConfigurationManager.AppSettings["OAuth_Weixin_AppSecret"]; public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_Weixin_RedirectUrl"]; public const string GET_AUTH_CODE_URL = "https://open.weixin.qq.com/connect/qrconnect"; public const string GET_ACCESS_TOKEN_URL = "https://api.weixin.qq.com/sns/oauth2/access_token"; public const string GET_USERINFO_URL = "https://api.weixin.qq.com/sns/userinfo"; /// <summary> /// 微信登錄，跳轉到登錄頁面 /// </summary> public override void Login() { //-------生成唯一隨機串防CSRF攻擊 string state = GetStateCode(); Session["Weixin_State"] = state; //state 放入Session string parms = "?appid=" + AppId + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&response_type=code&scope=snsapi_login" + "&state=" + state + "#wechat_redirect"; string url = GET_AUTH_CODE_URL + parms; Response.Redirect(url); //跳轉到登錄頁面 } /// <summary> /// 微信回調函數 /// </summary> /// <param name="code"></param> /// <param name="state"></param> /// <returns></returns> public override string Callback() { string code = Request.QueryString["code"]; string state = Request.QueryString["state"]; //--------驗證state防止CSRF攻擊 if (state != (string)Session["Weixin_State"]) { ShowError("30001"); } string parms = "?appid=" + AppId + "&secret=" + AppSecret + "&code=" + code + "&grant_type=authorization_code"; string url = GET_ACCESS_TOKEN_URL + parms; string str = GetRequest(url); NameValueCollection msg = ParseJson(str); if (!string.IsNullOrEmpty(msg["errcode"])) { ShowError(msg["errcode"], msg["errmsg"]); } Session["Weixin_AccessToken"] = msg["access_token"]; //access_token 放入Session Session["Weixin_OpenId"] = msg["openid"]; //access_token 放入Session return msg["access_token"]; } /// <summary> /// 顯示錯誤信息 /// </summary> /// <param name="code">錯誤編號</param> /// <param name="description">錯誤描述</param> private void ShowError(string code, string description = null) { if (description == null) { switch (code) { case "20001": description = "<h2>配置文件損壞或無法讀取，請檢查web.config</h2>"; break; case "30001": description = "<h2>The state does not match. You may be a victim of CSRF.</h2>"; break; case "50001": description = "<h2>接口未授權</h2>"; break; default: description = "<h2>系統未知錯誤，請聯系我們</h2>"; break; } Response.Write(description); Response.End(); } else { Response.Write("<h3>error:<h3>" + code + "<h3>msg:<h3>" + description); Response.End(); } }} 5.web.config配置信息
<appSettings> <!--QQ登錄相關配置--> <add key="OAuth_QQ_AppId" value="123456789" /> <add key="OAuth_QQ_AppKey" value="25f9e794323b453885f5181f1b624d0b" /> <add key="OAuth_QQ_RedirectUrl" value="http://www.domain.com/oauth20/qqcallback.aspx" /> <!--新浪微博登錄相關配置--> <add key="OAuth_Sina_AppKey" value="123456789" /> <add key="OAuth_Sina_AppSecret" value="25f9e794323b453885f5181f1b624d0b" /> <add key="OAuth_Sina_RedirectUrl" value="http://www.domain.com/oauth20/sinacallback.aspx" /> <!--微信登錄相關配置--> <add key="OAuth_Weixin_AppId" value="wx123456789123" /> <add key="OAuth_Weixin_AppSecret" value="25f9e794323b453885f5181f1b624d0b" /> <add key="OAuth_Weixin_RedirectUrl" value="http://www.domain.com/oauth20/weixincallback.aspx" /></appSettings>
