小编Bur*_*aba的帖子

我有一个登录页面，用户在其中输入用户名和密码，然后用户被重定向到他的帐户页面，但是当我按后退按钮时，它会将我带回到登录页面。我该如何防止这种情况发生。\n代码片段：

public Login ()\n{\n    if (App.IsUserLoggedIn == false)\n    {\n        InitializeComponent();\n    }\n    else\n    {\n        Navigation.PushAsync(new NavigationPage(new LoginIndexPage()));\n    }\n}\n\nprivate async void LoginButton_Clicked(object sender, EventArgs e)\n{\n    var user = new Xcore.Users.csUser\n    {\n        RefNo = referansnoEntry.Text,\n        Username = usernameEntry.Text,\n        Password = passwordEntry.Text\n    };\n    var isValid = IsCorrectLogin(user);\n    if (isValid)\n    {\n        App.IsUserLoggedIn = true;\n        await Navigation.PushAsync(new NavigationPage(new LoginIndexPage()));\n    }\n    else\n    {\n        showError.Text = "*Hatal\xc4\xb1 giri\xc5\x9f";\n        passwordEntry.Text = string.Empty;\n        usernameEntry.Text = string.Empty;\n        referansnoEntry.Text = string.Empty;\n    }\n}\nprivate bool IsCorrectLogin(Xcore.Users.csUser user)\n{\n    return user.RefNo == Xcore.Users.RegInfo.RefNo \n        && …