如何防止用户重复登录
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在我的应用程序中，我不希望两个用户使用相同的登录名登录。
例如，用户1以名称“ test1”登录，然后用户2也尝试以“ test1”登录，但是此时用户1的身份验证未过期，因此应拒绝用户2的登录。
我创建了一个缓存类来记录所有活动会话：
public class SessionDb {
private static Dictionary<string, HttpSessionState> sessionDB=new Dictionary<string, HttpSessionState>();
public SessionDb() {
}
public static void addUserAndSession(string name, HttpSessionState session) {
sessionDB.Add(name, session);
}
public static bool containUser(string name) {
//in fact,here I also want to check if this session is active or not ,but I do not find the method like session.isActive() or session.HasExpire() or something else.
return sessionDB.ContainsKey(name);
}
public static void removeUser(string name) {
if(sessionDB.ContainsKey(name)) {
sessionDB.Remove(name);
}
}
if(checkNameAndPass(sUserName, sUserPwd)) {
if(!SessionDb.containUser(sUserName)) {
//let the user login
Session[\"current_user_name\"] = sUserName;
SessionDb.addUserAndSession(sUserName, Session);
FormsAuthentication.RedirectFromLoginPage(UserName.Text, false);
}
else {
//
this.error.Text=string.Format(\"user {0} have logined!\", sUserName);
}
}
void Session_End(object sender, EventArgs e)
{
SessionDb.removeUser(Session[\"current_user_name\"].ToString());
}
没有找到相关结果
已邀请:
2 个回复
场竟矩喘崩
在您登录用户之前。坝镰补翔奋
protected void Login1_LoggingIn(object sender, LoginCancelEventArgs e) { MembershipUser u = Membership.GetUser(Login1.UserName); Response.Write(u.IsOnline); if (u.IsOnline) { Login1.FailureText = \"A user with this username is already logged in.\"; e.Cancel = true; }