How to integrate QQ login function with ASP

Reference is made to the "ASP. QQ2.0 Login code example" and "Login integration for-QQ interconnect authentication (ASP. NET version)".

usingSystem;usingSystem.Net;usingSystem.Text;usingSystem.IO;usingSystem.Collections.Specialized;usingSystem.Data;usingSystem.Configuration;usingNewtonsoft.Json.Linq;usingscratchline.database;usingSystem.Web.Security;namespacescratchline.cn{ Public Partial classLogin_qq:System.Web.UI.Page {Private StaticRandom Rndseed =NewRandom ();  Public stringgeneraterndnonce () {return(Rndseed.next (1,0xf423f). ToString ("000000") + Rndseed.next (1,0xf423f). ToString ("000000")); }         Public stringFile_get_contents (stringURL, Encoding encode) {HttpWebRequest Request=(HttpWebRequest) httpwebrequest.create (URL); WebResponse response=request.            GetResponse (); using(MemoryStream ms =NewMemoryStream ()) {                using(Stream stream =Response. GetResponseStream ()) {intREADC; byte[] buffer =New byte[1024x768];  while((READC = stream.) Read (Buffer,0, buffer. Length)) >0) {Ms. Write (Buffer,0, READC); }                }                returnencode. GetString (Ms.            ToArray ()); }} NameValueCollection Parseurlparameters (stringstr_params) {NameValueCollection NC=NewNameValueCollection (); foreach(stringPinchStr_params. Split ('&'))            {                string[] p_s = P.split ('='); nc. ADD (p_s[0], p_s[1]); }            returnNC; }        protected voidPage_Load (Objectsender, EventArgs e) {            //callback address after successful authorization            stringRedirect_uri = configurationmanager.appsettings["Redirect_uri"]; //AppID assigned to an app            stringclient_id = configurationmanager.appsettings["client_id"]; //Appkey assigned to a Web site            stringClient_secret = configurationmanager.appsettings["Client_secret"]; //User's OpenID            stringStropenid = request.querystring["OpenID"] ??string.            Empty; if(Stropenid.length <=0)            {                //STEP1: Get authorization Code                stringCode = request.querystring["Code"]; if(string. IsNullOrEmpty (code)) {//The state parameter is used to prevent csrf attacks, and callbacks are returned as they were after successful authorization.session[" State"] = Generaterndnonce ();//MD5 (Uniqid (rand (), TRUE));                     stringAuthorize_uri =string. Format ("https://graph.qq.com/oauth2.0/authorize?response_type=code&client_id={0}&redirect_uri={1}& STATE={2}", client_id, Server.URLEncode (Redirect_uri), session[" State"]);                Response.Redirect (Authorize_uri); }                //STEP2: Get access Token by authorization code                if(request[" State"]. ToString (). Equals (session[" State"]. ToString ())) {//Parse Access_token return package                    stringToken_uri =string. Format ("Https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&client_id={0}&client_secret={1} &CODE={2}&REDIRECT_URI={3}", client_id, Client_secret, Code, Redirect_uri); stringAccesstoken =file_get_contents (Token_uri, Encoding.UTF8); NameValueCollection PS=parseurlparameters (Accesstoken); stringAccess_token = ps["Access_token"]; stringexpires_in = ps["expires_in"]; stringRefresh_token = ps["Refresh_token"]; //Parse OpenID return package                    stringMe_uri =string. Format ("https://graph.qq.com/oauth2.0/me?access_token={0}", Access_token); stringcallback =file_get_contents (Me_uri, Encoding.UTF8); if(Callback. Contains ("Callback"))                    {                        intLpos = callback. IndexOf ("("); intRpoS = callback. IndexOf (")"); Callback= callback. Substring (Lpos +1, Rpos-lpos-1); } jobject jobject=Jobject.parse (callback); stringOpenID = jobject["OpenID"].                    ToString (); //STEP4: Get user information through Access_token,appid,openid                    stringGet_user_info_uri =string. Format ("https://graph.qq.com/user/get_user_info?access_token={0}&oauth_consumer_key={1}&openid={2}", Access_token, client_id, OpenID); stringUser_info =file_get_contents (Get_user_info_uri, Encoding.UTF8); Jobject=Jobject.parse (User_info); session["Nickname"] = jobject["Nickname"].                    ToString (); session["figureurl_qq_2"] = jobject["figureurl_qq_2"].                    ToString (); stringSQL =string. Format ("SELECT * from _users WHERE openid= ' {0} '", OpenID); DataTable DT=Sqlserver.select (SQL); if(dt. Rows.Count <=0) {SQL=string. Format ("INSERT into _users ([Nickname],[openid]) VALUES (' {0} ', ' {1} ')", session["Nickname"], OpenID);                    Sqlserver.execute (SQL); }                    //Authorize and JumpFormsauthentication.setauthcookie (OpenID,false); Response.Redirect ("index.aspx"); }            }        }    }}

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How to integrate QQ login function with ASP