RadHighlightTextBlock in an RadAutoCompleteBox

Environment

Product Version	2023.3.1011
Product	RadHighlightTextBlock for WPF

Description

How to use RadHighlightTextBlock in an RadAutoCompleteBox.

Solution

Define a new DataTemplate that contains a RadHighlightTextBlock instance and set it to the DropDownItemTemplate property of RadAutoCompleteBox. Bind the Text property of the RadHighlightTextBlock to the property from the items' model that will be displayed in the RadAutoCompleteBox instance. Bind the HighlightText property to the SearchText property of RadAutoCompleteBox.

Define the items' model and the view model

C#

    public class ItemInfo
    {
        public string Content { get; set; }
    }

    public class MainViewModel
    {
        public MainViewModel()
        {
            this.ItemInfos = new ObservableCollection<ItemInfo>()
            {
                new ItemInfo() { Content = "Item 1" },
                new ItemInfo() { Content = "Item 2" },
                new ItemInfo() { Content = "Item 3" },
            };
        }

        public ObservableCollection<ItemInfo> ItemInfos { get; set; }
    }

VB.NET

    Public Class ItemInfo
        Public Property Content As String
    End Class

    Public Class MainViewModel
        Public Sub New()
            Me.ItemInfos = New ObservableCollection(Of ItemInfo)() From {
                New ItemInfo() With {
                    .Content = "Item 1"
                },
                New ItemInfo() With {
                    .Content = "Item 2"
                },
                New ItemInfo() With {
                    .Content = "Item 3"
                }
            }
        End Sub

        Public Property ItemInfos As ObservableCollection(Of ItemInfo)
    End Class

Creating a DataTemplate with a RadHighlightTextBlock

XAML

    <DataTemplate x:Key="HighlightTextBlockDataTemplate">
        <telerik:RadHighlightTextBlock Text="{Binding Content}"
                                       HighlightText="{Binding RelativeSource={RelativeSource   AncestorType=telerik:RadAutoCompleteBox}, Path=SearchText}"/>
    </DataTemplate>

Set the custom DataTemplate to the DropDownItemTemplate property of RadAutoCompleteBox

XAML

    <telerik:RadAutoCompleteBox
                         ItemsSource="{Binding ItemInfos}"
                         HorizontalAlignment="Center"
                         Width="150"
                         VerticalAlignment="Center"
                         AutoCompleteMode="Suggest"
                         TextSearchMode="Contains"
                         TextSearchPath="Content"
                         DropDownItemTemplate="{StaticResource HighlightTextBlockDataTemplate}"/>

RadAutoCompleteBox with RadHighlightTextBlock