WPF组合框未显示类似Winform组合框的建议

Question

I am struggling with WPF Combobox in order to show suggestion while user is typing like this (in WinForms):

But what is happing is that the combobox is appending when user is typing like this (in WPF):

Problem How can I show a dropdown list when user is typing as suggestions

Many many thanks for your attention.

My Code:

 <ComboBox x:Name="item_category" Width="190" IsEditable="True" SelectionChanged="category_SelectionChanged"/>

Answer 1

You should use AutoCompleteBox which behaves dropdown as well as autocomplete.

You can install from this version

Answer 2

Add this event to your ComboBox :

<ComboBox Name="cmb1" IsEditable="True" PreviewTextInput="cmb1_PreviewTextInput">
</ComboBox>

Then in the code behind:

List<string> db;
public Window()
{
     InitializeComponent();
     db = new List<string> { "abc","abg","hjn" };
     cmb1.ItemsSource = db;
}

private void cmb1_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
     cmb1.ItemsSource = db.Where(p => p.Contains(e.Text)).ToList();
     cmb1.IsDropDownOpen = true;
}