在Xamarin.Form页C#之间传递Int

// 在源页面
public class SourcePage : ContentPage
{
    public SourcePage()
    {
        Button button = new Button { Text = "Go to Target Page" };
        button.Clicked += async (sender, e) =>
        {
            await Navigation.PushAsync(new TargetPage(42));
        };

        Content = new StackLayout
        {
            Children = { button }
        };
    }
}

// 在目标页面
public class TargetPage : ContentPage
{
    public int PassedInt { get; }

    public TargetPage(int passedInt)
    {
        PassedInt = passedInt;

        Label label = new Label { Text = $"Passed Int: {PassedInt}" };
        Content = new StackLayout
        {
            Children = { label }
        };
    }
}

// 在源页面
public class SourcePage : ContentPage
{
    public SourcePage()
    {
        Button button = new Button { Text = "Go to Target Page" };
        button.Clicked += async (sender, e) =>
        {
            var navigationParams = new NavigationParameters();
            navigationParams.Add("passedInt", 42);
            await Navigation.PushAsync(new TargetPage(), navigationParams);
        };

        Content = new StackLayout
        {
            Children = { button }
        };
    }
}

// 在目标页面
public class TargetPage : ContentPage
{
    public TargetPage()
    {
        NavigationPage.SetHasNavigationBar(this, false);

        var passedInt = NavigationContext.Current.Parameters.GetValue<int>("passedInt");

        Label label = new Label { Text = $"Passed Int: {passedInt}" };
        Content = new StackLayout
        {
            Children = { label }
        };
    }
}