xamarin-forms-docs/knowledge-base/autocompleteview-avoid-duplicate-tokens.md

title	description	type	page_title	slug	position	tags	ticketid	res_type
How to avoid adding duplicate tokens to Tokens collection	avoid selecting the same suggestion twice	how-to	How not to select duplicate items in AutoCompleteView	autocompleteview-avoid-duplicate-tokens		autocompleteview, tokens, duplicates, Xamarin, XamarinForms	1403830	kb

Environment

Product Version	2019.1.318.1
Product	AutoCompleteView for Xamarin

Description

What is the best way to avoid adding duplicate tokens to Tokens collection RadAutoCompleteView?

Solution

You could use SuggestionItemSelected event to remove the item - this event is fired before the item is actually added to the Tokens collection, so, if you call directly in its handler the Remove method of the Tokens collection, it will remove the second time the item is added. Here is a sample snippet:

<telerikInput:RadAutoCompleteView x:Name="autoCompleteView"
            ImagePath="ImageSource"
            ItemsSource="{Binding Source}"
            TextSearchPath="Name"
            DisplayMode="Tokens"                               
            SuggestionItemSelected="AutoCompleteView_SuggestionItemSelected"/>

and the event handler:

private void AutoCompleteView_SuggestionItemSelected(object sender, Telerik.XamarinForms.Input.AutoComplete.SuggestionItemSelectedEventArgs e)
{
    autoCompleteView.Tokens.Remove(e.DataItem);
}