在內容頁面之間移動的導航問題 .NET MAUI for Android

Question

您好，感謝您提前閱讀...我有一個項目旨在為皮划艇公司提供客戶預訂系統，並創建了初始登錄頁面，該頁面適用於驗證方面的所有意圖和目的，但是當我單擊登錄時按鈕 [並且細節似乎已經過驗證，它不會轉移到下一個內容頁面 [查看]。 我附上了一個視頻鏈接，在實踐中展示了這個問題，但我希望能得到一些幫助，幫助我發現我錯過了什么愚蠢的事情，因為我整晚和今天都在做這件事，我認為我對明顯的？？ 導航問題屏幕錄制

    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()));
}

為了更清楚起見，下面是整個代碼表，但我認為是上面的代碼被觸發並產生了我認為有問題的結果:(

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()));
    }
}

因此，重申一下，問題在於通過單擊按鈕在一頁與另一頁之間導航，這似乎正在觸發，並且驗證的模式替代方案按預期工作，但是當找到正確的詳細信息時，它不會觸發新的頁面如預期:( 我知道我錯過了那個 obvs，但我對這個環境還很陌生，所以很高興知道我遇到了什么問題，這樣我就可以把它放到愚蠢的陷阱框中. 再次感謝任何讀到這里並能提供幫助的人。（下面是該項目的副本，以防我所說的內容在沒有正確查看的情況下不容易破譯）

SKT 項目@GoogleDrive

Answer 1

所以看起來我是個徹頭徹尾的白痴，並沒有更改 App.xaml.cs 來調用 MainPage() 的應用程序入口上的導航頁面

我真是個笨手笨腳的人，但我猜這是因為沒有規律的休息，並且迷失在這一切中 doh。 我必須感謝@ToolMakerSteve 對 APp.xaml 的點頭，因為當我到達那里時，我注意到它不在導航頁面設置中

曾是...

MainPage = new MainPage();

現在...

MainPage = new NavigationPage( new MainPage());

這解決了這個問題 [有點我的理智，感謝你作為音板 Stackoverflow 和貢獻者在那里] 當然它表明我的驗證很糟糕，因為任何密碼和任何用戶名組合現在都可以進入下一個視圖，哈哈所以現在需要正確控制那個:)