Xamarin.Forms C#: как поместить значение в слайдер при загрузке страницы ⇐ C#

[Anonymous]

I have some pages in my application. From the "MainMenu Page" I can navigate to a "Configuration Page". At the first time,in "MainMenu" I start the parameter "QuestionsToAsk" with 7.

When I call the "Configuration Page" I gave the parameter to the page, and I checked that the correct value is there. But the Slider shows "1" as the value when the page is loaded.

I use VM to control all the code of the page.

On the XAML I have this code:

On the VM I have this code:

public class VMConfigurationPage : BaseViewModel { int maximum; int questionsToAsk; public VMConfigurationPage(INavigation navigation, int questionsToAsk) { Navigation = navigation; Maximum = 40; QuestionsToAsk = questionsToAsk; } public int Maximum { get { return maximum; } set { SetValue(ref maximum, value); } } public int QuestionsToAsk { get { return questionsToAsk; } set { SetValue(ref questionsToAsk, value); } } } On the class "BaseModel" I have this code:

public class BaseViewModel : INotifyPropertyChanged { public INavigation Navigation; public event PropertyChangedEventHandler PropertyChanged; public void OnpropertyChanged([CallerMemberName] string nombre = "") { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nombre)); } protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } protected bool SetProperty(ref T field, T value, [CallerMemberName] string propertyName = null) { if (EqualityComparer.Default.Equals(field, value)) { return false; } field = value; OnPropertyChanged(propertyName); return true; } private string _title; public string Title { get { return _title; } set { SetProperty(ref _title, value); } } protected void SetValue(ref T backingFieled, T value, [CallerMemberName] string propertyName = null) { if (EqualityComparer.Default.Equals(backingFieled, value)) { return; } backingFieled = value; OnPropertyChanged(propertyName); } } When I call the page, I gave a value (for example 7) to the parameter "questionsToAsk".
And I want to have the Slider with the value "7".
But the slider appears in the page with "1", not with the value that I gave to the page.

However, when I modify the Slider, the text shows the correct value. And the parameter "QuestionsToAsk" stores correctly the value of the Slider.

I tried changing the Mode in the Slider with:
Value="{Binding QuestionsToAsk, Mode=OneWay}"
And the Label shows "7", but the Slider has 1 as the value.

My problem is to start the value of the Slider at the beginning.

Any idea about where is the error?

I tried to change the "Mode".
I tried to use different parameters for the text and for the Slider.
But no results


Источник: https://stackoverflow.com/questions/780 ... -is-loaded