Is it possible to assign key/value to a picker?

Issue

Im trying to use a picker similar to html's

<select>
<option value="KEY">Value</option>
</select>

However I can't find anything relating to this. I have something along the lines of

List<KeyValuePair<int, string>> KVP = {1: "test", 2: "test2"}

Current xaml:

<StackLayout x:Name="PickerStack">
                <Picker x:Name="DefaultPicker"
                        Title="---Select a map---" 
                        ItemsSource="{Binding GPXList_PickerList}" 
                        SelectedIndexChanged="PickerStack_Selected" 
                        SelectedItem="{Binding PickerStack_Selection}" />

Current code behind:

    var ResultConvert = JsonConvert.DeserializeObject<GPSAPI_GPXList[]>(ResultJSON);
            List<int> gpxList_ID = ResultConvert.Select(x => x.gpxList_ID).ToList();
            List<string> gpxList_TrailHead_Name = ResultConvert.Select(x => x.gpxList_TrailHead_Name).ToList();
            GPXList_Dictionary = ResultConvert.ToDictionary(x => x.gpxList_ID, x => x.gpxList_TrailHead_Name);
//
            // call for my picker to be populated
            PickerView(GPXList_PickerItems);

        }

        //
        // fill the picker with retrieved API values
        public void PickerView(List<KeyValuePair<int, string>> PickerSource)
        {
            DefaultPicker.ItemsSource = PickerSource;
        }

        //
        // observe the PickerStack and retrieve values on change
        private void PickerStack_Selected(object sender, EventArgs e)
        {
            Picker PickerSelection = sender as Picker;
            TrailText.Text = PickerSelection.SelectedItem.ToString();
        }

And would like to just display to the user the Value but return to the program the Key

public List<KeyValuePair<int, string>> GPXList_PickerItems { get; set; }

Solution

As Jason commented, use ItemDisplayBinding

   <Picker x:Name="DefaultPicker"
                        Title="---Select a map---" 
                        ItemsSource="{Binding GPXList_PickerList}" 
                        SelectedIndexChanged="PickerStack_Selected" 
                        SelectedItem="{Binding PickerStack_Selection}"
                        ItemDisplayBinding="{Binding Value}" />

void PickerStack_Selected(object sender, EventArgs e)
{
    if (sender is Picker picker)
        int key = ((KeyValuePair<int, string>)picker.SelectedItem).Key;
}

Answered By - Cfun