RadHighlightTextBlock in an RadAutoSuggestBox

Environment

Product Version	2023.3.1011
Product	RadHighlightTextBlock for WPF

Description

How to use RadHighlightTextBlock in an RadAutoSuggestBox.

Solution

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

Define the items' model and the view model

• C#
• VB.NET

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; } 
 
    public ObservableCollection<ItemInfo> GetItemInfosByText(string searchText) 
    { 
        var result = new ObservableCollection<ItemInfo>(); 
        var lowerText = searchText.ToLowerInvariant(); 
        return new ObservableCollection<ItemInfo>(ItemInfos.Where(x => x.Content.ToLowerInvariant().Contains(lowerText)).ToList()); 
    } 
} 

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) 
 
    Public Function GetItemInfosByText(ByVal searchText As String) As ObservableCollection(Of ItemInfo) 
        Dim result = New ObservableCollection(Of ItemInfo)() 
        Dim lowerText = searchText.ToLowerInvariant() 
        Return New ObservableCollection(Of ItemInfo)(ItemInfos.Where(Function(x) x.Content.ToLowerInvariant().Contains(lowerText)).ToList()) 
    End Function 
End Class 

Creating a DataTemplate with a RadHighlightTextBlock

• XAML

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

Set the custom DataTemplate to the ItemTemplate property of RadAutoSuggestBox

• XAML

<telerik:RadAutoSuggestBox 
                     ItemsSource="{Binding ItemInfos}" 
                     HorizontalAlignment="Center" 
                     TextChanged="RadAutoSuggestBox_TextChanged" 
                     Width="150" 
                     VerticalAlignment="Center" 
                     TextMemberPath="Content" 
                     ItemTemplate="{StaticResource HighlightTextBlockDataTemplate}"/> 

RadAutoSuggestBox with RadHighlightTextBlock