/// <summary>
/// 是否强制（挤掉当登录用户)
/// </summary>
/// <param name="force"></param>
public void SignOut(string username, bool force)
{
IPrincipal user = new OpenIDPrincipal(new OpenIDIdentity(null), force);
HttpContext.Current.User = user;
HttpContext.Current.Session["customidentity"] = user;
}
public void SignIn(UserModel userModel)
{
IPrincipal user = new OpenIDPrincipal(new OpenIDIdentity(userModel));
HttpContext.Current.User = user;
HttpContext.Current.Session["customidentity"] = user;
}