如何防止同一帐户重复登录系统

如何防止同一帐户重复登录系统

 

如何防止控制客户端使其用同一帐户重复登录系统.

 

解决思路： 维护一online表，查看有登陆，就不允许再次登陆，以sessionid作为唯一标识符号，

 

也可以产生一个ＧＵＩＤ发到ＣＯＯＫＩＥ中，以区分不同的ＣＬＩＥＮＴ，再佐以ＪＳ，可以达到更好的效果，比如离开后自动离线

 

 

解决代码： public virtual void Application_Start(object sender, EventArgs e) { // reset the mailer indicator Application["MailerStatus"] = "All Mailings Complete"; // initialize a datatable for users online DataTable objUserTable = new DataTable(); objUserTable.Columns.Add("SessionID",System.Type.GetType("System.Guid")); objUserTable.Columns.Add("PeopleID",System.Type.GetType("System.Int32")); objUserTable.Columns.Add("ShowDetail",System.Type.GetType("System.Boolean")); DataColumn[] pk = new DataColumn[1]; pk[0] = objUserTable.Columns[0]; objUserTable.PrimaryKey = pk; Application["UserTable"] = objUserTable; }

 

/**//// /// The Session_Start event adds user session information to /// Application["UserTable"]. ///

 

public virtual void Session_Start(object sender, EventArgs e) { Application.Lock(); //Application.Lock (); DataTable objUserTable = (DataTable)Application["UserTable"]; DataRow objRow = objUserTable.NewRow(); Guid objGuid = Guid.NewGuid(); objRow[0] = objGuid; Session["PfSessionID"] = objRow[0]; objRow[1] = 0; objRow[2] = false; objUserTable.Rows.Add(objRow); Application["UserTable"] = objUserTable; Application.UnLock(); } /**//// /// The Session_End event deletes user session information from /// Application["UserTable"]. ///

 

public virtual void Session_End(object sender, EventArgs e) { Application.Lock(); DataTable objUserTable = (DataTable)Application["UserTable"]; objUserTable.Rows.Find((Guid)Session["PfSessionID"]).Delete(); Application["UserTable"] = objUserTable; Application.UnLock(); }