Selected Item Binding is not working for the Picker.

Question

Hello, I had picker, I want to explicitly bind the selected item. I mean before the user selection iteself i want to display an item in the picker.

here is my picker.

 <Picker

     x:Name="languageSelectionPicker"

     BackgroundColor="White"

     FontFamily="AppRobotoRegularFont"

     ItemDisplayBinding="{Binding LanguageName}"

     ItemsSource="{Binding SupportedLanguages}"

     SelectedItem="{Binding SelectedLanguage, Mode=TwoWay}" />  

When ever im navigating to that page im doing like this

    vm.SelectedLanguage = App.GetSupportedLanguages().FirstOrDefault(e => e.LanguageKey == Thread.CurrentThread.CurrentCulture.Name);

But this is not working as expected.

Thanks
Vaibhav Methuku.

Answer 1

Hello,

Firstly, you need to set the SelectedLanguage type to be consistent with the Model.

For example, you have a Model like following code.

public class MyModel
{
    public string LanguageName { get; set; }
}

Then you need to set type of the SelectedLanguage to the MyModel like following code.

internal class MyViewModel: INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    public void OnPropertyChanged([CallerMemberName] string name = "") =>
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
 

    private MyModel selectedLanguage;
 
    public MyModel SelectedLanguage
    {
        get { return selectedLanguage; }
        set { selectedLanguage = value;OnPropertyChanged(); }
    }


    public ObservableCollection<MyModel> SupportedLanguages { get; set; }
 
    public MyViewModel()
    {
        SupportedLanguages=new ObservableCollection<MyModel>();

 //add static value for testing.
        for (int i = 0; i < 10; i++)
        {
            SupportedLanguages.Add( new MyModel() { LanguageName="test"+i });
        }
    }
}

For example, I want to set the SelectedLanguage that MyModel's LanguageName is "test1", then return back MyModel to the SelectedLanguage.

vm.SelectedLanguage = vm.SupportedLanguages.Where<MyModel>(t=>t.LanguageName.Equals("test1")).FirstOrDefault();

Best Regards,

Leon Lu

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