Validating xamarin.forms picker

Question

I use this code to get the selected item on my picker:

var loanType = picker.Items[picker.SelectedIndex];

I want to validate the picker when nothing is selected but it returns:

System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'

I understand that it's because nothing is selected, so I wanted to ask if there is any workaround to this. I use syntax picker.Items[picker.SelectedIndex]; instead of pickerPaymentMode.SelectedIndex because the picker's item source is from a list coming from a JSON response via API

Answer 1

If nothing is selected in the picker, the value of picker.SelectedIndex is -1 .

So you can check everytime you use picker.SelectedIndex :

    if (picker.SelectedIndex != null && picker.SelectedIndex >=0)
    {
        var loanType = picker.Items[picker.SelectedIndex];

    }
    else
    {
        Console.WriteLine(picker.SelectedIndex);
    }