c# - 获取在 ContentPage 中更改的 int 的结果

Question

我有一个具有以下页面结构的应用程序:

MainPage
        ->SettingsPage
                      ->InputLanguagePage
                      ->OutputLanguagePage

所有页面都是内容页面。

InputLanguagePage 和 OutputLanguagePage 是完全相同的页面，所以我不想对相同的页面进行两次编程。

我当然可以实例化同一个页面两次，但我不知道我应该如何获得返回值。

我花了很长时间试图描述我的问题。也许下面的代码可以更好地说明问题。

如您所见，我似乎无法获取 LanguageSelectionPage 的返回值，因为它显示为异步。将其更改为 Navigation.PushModalAsync() 也没有任何改变。

让 ContentPage 返回值或更改值并收到相关通知的最佳方式是什么？

谢谢。

主页:

public class MainPage : ContentPage
{
    private async void OnSettingsSelected(object sender, EventArgs e)
    {
        SettingsPage nSettings = new SettingsPage();
        await this.Navigation.PushAsync(nSettings);
    }
(...)

设置页面:

public class SettingsPage : ContentPage
{
    public SettingsPage()
    {
        protected override async void OnAppearing()
        {
            base.OnAppearing();

            _btnInputLanguage.Clicked += async (sender, e) =>
            {
                LanguageSelectionPage nInputLanguage = new LanguageSelectionPage();
                nInputLanguage.SelectedLCID = App.Settings.InputLanguageLCID;
                await Navigation.PushAsync(nInputLanguage);
                //The user can change "int SelectedLCID" within the ContentPage, but I have no idea how I could access it
                return;
            };

            _btnOutputLanguage.Clicked += async (sender, e) =>
            {
                LanguageSelectionPage nOutputLanguage = new LanguageSelectionPage();
                nOutputLanguage.SelectedLCID = App.Settings.OutputLanguageLCID;
                await Navigation.PushAsync(nOutputLanguage);
                //The user can change "int SelectedLCID" within the ContentPage, but I have no idea how I could access it
                return;
            };

(...)

语言选择页面:

public class LanguageSelectionPage : ContentPage
{
    public int SelectedLCID { get; set; }

    protected override async void OnAppearing()
    {
        base.OnAppearing();

(...)

Answer 1

当你要求加载页面时，我会给solutin传递ass参数

public partial class InputLanguagePage : ContentPage
{
    public InputLanguagePage(string Selection)
    {
        InitializeComponent();
    }
}

public partial class OutputLanguagePage : ContentPage
{
    public OutputLanguagePage(string Selection)
    {
        InitializeComponent();
    }
}

在设置页面按钮点击

_btnInputLanguage.Clicked += async (sender, e) =>
{
   Navigation.PushAsync(new InputLanguagePage ("SelectLanguage"));
   return;
};

 _btnOutputLanguage.Clicked += async (sender, e) =>
{
    Navigation.PushAsync(new OutputLanguagePage("SelectLanguage"));
    return;
};