在内容页面之间移动的导航问题.NET MAUI for Android

Question

嗨，感谢您提前阅读... 我有一个旨在为皮划艇公司提供客户端预订系统的项目，并创建了初始登录页面，该页面适用于验证方面的所有意图和目的，但是当我单击登录按钮时，它不会转移到下一个内容页面[视图]。 我附上了一个视频链接，显示了这个问题，但是我很感谢您在整夜都在发现我错过了什么愚蠢的事情时，并认为我对此有些看不见明显的！？ 导航问题屏幕录制

    private void BtnLogin_Clicked(object sender, EventArgs e)
{
    //shifty debug
    btnLogin.Text = "click received...";

    string user = entUsername.Text;
    string pass = entPassword.Text;
    string[] users = new string[result.Members.Length];
    string[] passes = new string[result.Members.Length];
    for (int i = 0; i < result.Members.Length; i++)
    {
        users[i] = result.Members[i].Usr;
        users[i] = result.Members[i].Pass;
    }

    if (user == string.Empty || pass == string.Empty)
    {
        InputError($"User: {user}\nPass: {pass}\n Nothing was entered in one of the text fields");
    }
    else
    {
        switch (user)
        {
            case "gruff":
                case "kieran":
                    case "zara":
                    {
                        NextPage();
                        break;
                    }
            default:
                InputError($"User: {user}\nPass: {pass}\n Not a correct user and/or password");
                break;
        }
    }
}
private void InputError(string v)
{
     Navigation.PushModalAsync(new InfoModal(v));
}
private void NextPage()
{
    btnLogin.Text = "At NextPage Method caledl";
    //so after a number of attempts to show a modal or next page 
    //some success with modal above, but possibly hangs after... i think
    //no success with content page change: the start for tomrorrow :/
    Navigation.PushAsync((new ClientMainPage()));
}

以下是整个代码表，以确保更好的清晰度，但是上面的代码是触发和生产我的我的代码表我认为可疑的结果:(

public partial class MainPage : ContentPage
{
    //simple admin cover fr viewing xml data
    private const string admin = "123";
    private bool revealState = true;
    private System.Xml.Serialization.XmlSerializer serializer;
    private XmlMemberData result;

    public MainPage()
    {
        InitializeComponent();
        GetMembers();
    }

    private async void GetMembers()
    {
        await using var stream = await FileSystem.OpenAppPackageFileAsync("Members.xml");

        serializer = new System.Xml.Serialization.XmlSerializer(typeof(XmlMemberData));

        result = (XmlMemberData)serializer.Deserialize(stream);

        IEnumerable<Member> members = result?.Members.ToList();
    }

    private void BtnMembersCheck_Clicked(object sender, EventArgs e)
    {    
        if(revealState)
        {
            string adminKey = entAdminKey.Text;

            if (adminKey != admin)
            {
                adminKey = "";
                entAdminKey.Text = string.Empty;

                //pop up a modal warning? - UX
                return;
            }

            var members = result?.Members.ToList();

            switch (members?.Count)
            {
                case 0:
                    StatusLabel.Text = "None Found, Are you sure you created any users?";
                    break;
                case > 0:
                    StatusLabel.Text = $"{members.Count} Members Loaded!";
                    BooksListControl.ItemsSource = members;
                    btnMembersCheck.Text = "ClearData";
                    revealState = !revealState;
                    break;
                default:
                    StatusLabel.Text = "Something went wrong";
                    break;
            }
        }
        else
        {            
            StatusLabel.Text = "To View Again Re-Enter Admin Key";
            entAdminKey.Text = string.Empty;
            btnMembersCheck.Text = "Reload Admin Keys";
            BooksListControl.ItemsSource = null;
            revealState = !revealState;
            return;
        }       
    }

    private void BtnLogin_Clicked(object sender, EventArgs e)
    {
        //shifty debug
        btnLogin.Text = "click received...";

        string user = entUsername.Text;
        string pass = entPassword.Text;
        string[] users = new string[result.Members.Length];
        string[] passes = new string[result.Members.Length];
        for (int i = 0; i < result.Members.Length; i++)
        {
            users[i] = result.Members[i].Usr;
            users[i] = result.Members[i].Pass;
        }

        if (user == string.Empty || pass == string.Empty)
        {
            InputError($"User: {user}\nPass: {pass}\n Nothing was entered in one of the text fields");
        }
        else
        {
            switch (user)
            {
                case "gruff":
                    case "kieran":
                        case "zara":
                        {
                            NextPage();
                            break;
                        }
                default:
                    InputError($"User: {user}\nPass: {pass}\n Not a correct user and/or password");
                    break;
            }
        }
    }
    private void InputError(string v)
    {
         Navigation.PushModalAsync(new InfoModal(v));
    }
    private void NextPage()
    {
        btnLogin.Text = "At NextPage Method caledl";
        //so after a number of attempts to show a modal or next page 
        //some success with modal above, but possibly hangs after... i think
        //no success with content page change: the start for tomrorrow :/
        Navigation.PushAsync((new ClientMainPage()));
    }
}

要重申，问题是在单击按钮时在一个页面之间导航到另一页之间，这似乎是在触发，而验证的模态替代方案是按预期工作的，但是当找到正确的详细信息时，不会像预期的那样发射新页面 :(我知道这是我所缺少的，但是我对这个环境来说是个新手，所以很高兴知道我绊倒了什么，所以我可以将其放入傻瓜盒子中。 非常感谢任何阅读本文并可以提供帮助的人。 （下面是该项目的副本，以防我所说的话，如果没有适当的外观就不太容易解密）

skt project @ googledrive

Answer 1

因此，看来我是一个完整的白痴，也没有更改teh app.xaml.cs来调用app entry for mainpage（）

我真clut脚的 导航页面失去了一切。
我必须感谢@toolmakersteve对app.xaml的点头，因为当我到达那里时，我注意到这不是在导航页面

...

MainPage = new MainPage();

中

MainPage = new NavigationPage( new MainPage());

设置 作为音板堆叠流和贡献者在那里]
当然，它揭示了我的验证很烂，因为任何密码和任何用户名组合现在都可以到达下一个视图，因此现在需要正确控制它:)