// GET: Profile/ShowUser public ActionResult ShowUser() { if (string.IsNullOrEmpty(Request.QueryString["username"])) { return(Redirect("/Profile")); } UserHandle handle = UserManager.Default.QueryUserByName(Request.QueryString["username"]); if (handle == null) { // 用户不存在。 return(Redirect("/Profile")); } UserProfileModel model = UserProfileModel.FromUserHandle(handle); return(View(model)); }