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<ContentPage.ToolbarItems>
        <ToolbarItem Text="Sort" Command="{Binding SortCommand,Mode=OneTime}"/>
    </ContentPage.ToolbarItems>
...
   

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namespace DynamicDataGroupingSample
{
    public class MainViewModel : ReactiveObject, IDisposable
    {
        public MainViewModel()
        {
            ...
            //Filter logic
            Func<Restaurant, bool> countryFilter(string country) => restaurant =>
            {

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<Picker Title="Choose Country
         SelectedItem="{Binding SelectedCountryFilter}">
        <Picker.Items>
            <x:String>All</x:String>
               <x:String>United States</x:String>
               <x:String>Venezuela</x:String>
               <x:String>Dominican Republic</x:String>
                <x:String>Colombia</x:String>
         </Picker.Items>
</Picker>

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namespace DynamicDataGroupingSample
{
    public class MainViewModel : ReactiveObject, IDisposable
    {
        public MainViewModel()
        {
            // Initial data
            _sourceCache.AddOrUpdate(new List<Restaurant>()
            {
                new Restaurant("Yao","Casual","Asian Fusion","Dominican Republic"),

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  <SearchBar Text="{Binding SearchText}" />
  <ListView  ItemsSource="{Binding Restaurants}">
      <ListView.ItemTemplate>
          <DataTemplate x:DataType="local:Restaurant">
              <TextCell Text="{Binding Name}"
                          Detail="{Binding Type}"/>
          </DataTemplate>
      </ListView.ItemTemplate>
</ListView>

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 _cleanUp = _sourceCache.Connect()
            .RefCount()
            .Filter(filterPredicate)
            .Bind(out _restaurants)
            .DisposeMany()
            .Subscribe();

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var filterPredicate = this.WhenAnyValue(x => x.SearchText)
                          .Throttle(TimeSpan.FromMilliseconds(250), RxApp.TaskpoolScheduler)
                          .DistinctUntilChanged()
                          .Select(restaurantFilter);

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Func<Restaurant, bool> restaurantFilter(string text) => restaurant =>
  {
      return string.IsNullOrEmpty(text) || restaurant.Name.ToLower().Contains(text.ToLower()) || restaurant.Type.ToLower().Contains(text.ToLower());
  };

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namespace DynamicDataGroupingSample
{
    public class MainViewModel : ReactiveObject
    {
        public MainViewModel() { ... }

        public string SearchText
        {
            get => _searchText;
            set => this.RaiseAndSetIfChanged(ref _searchText, value);

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_sourceCache.Edit((update) =>
{
    update.Remove(restaurant);
});