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How to filter using Custom SuggestionMode in AutoComplete?

Platform: WPF |
Control: SfTextBoxExt |
Published Date: November 17, 2014 |
Last Revised Date: June 21, 2019

You can filter by single letter suggestion using Custom SuggestionMode in SfTextBoxExt control.

Create a Custom filter

Create a delegate method matching the predicate <string, T> for filtering suggestions.

Set SuggestionMode and Filter property

Set the property SuggestionMode=”Custom” and the delegate method for Filter property.


<Window x:Class="AutoComplete_132047.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        Title="MainWindow" Height="350" Width="525">
        <input:SfTextBoxExt AutoCompleteSource="{Binding Items}" SearchItemPath="Name" AutoCompleteMode="Suggest" SuggestionMode="Custom" x:Name="autoComplete"/>



public partial class MainWindow : Window
        public MainWindow()
            autoComplete.Filter = Filter;    
        private bool Filter(string text, object item)
            if ((item as Model).Name.Contains(text))
                return true;
                return false;
public class Model
        private string name;
        public string Name
            get { return name; }
            set { name = value; }
    public class ViewModel
        private List<Model> items;
        public List<Model> Items
            get { return items; }
            set { items = value; }
        public ViewModel()
            items = new List<Model>();
            items.Add(new Model() { Name="A" });
            items.Add(new Model() { Name = "AA" });
            items.Add(new Model() { Name = "AB" });
            items.Add(new Model() { Name = "AC" });
            items.Add(new Model() { Name = "A1" });
            items.Add(new Model() { Name = "B" });
            items.Add(new Model() { Name = "C" });
            items.Add(new Model() { Name = "D" });
            items.Add(new Model() { Name = "E" });

The above code filters using single letter suggestions and the screenshot is as follows.



Figure 1: AutoComplete using Filter

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