CODEWITHSUNDEEP
wpfcomboboxautocomplete
nammae
nammae

Reputation: 109

WPF ComboBox's SelectedIndex doesn't change after setting its IsTextSearchEnabled to false

Let's say I have a ComboBox named comboBox.

I want to disable ComboBox's auto complete feature.

At first I thought that everything I need to do is setting its IsTextSearchEnabled to false as following

comboBox.IsTextSearchEnabled = false;

But it seems doing this cause some unexpected side effects.

When IsTextSearchEnabled = true (which is default with combobox) if you try to set a value for ComboBox's Text, the combobox will find corresponding index in its ItemsSource and update the its SelectedIndex accordingly.

List<string> lst = new List<string>();
lst.Add("1");
lst.Add("2");
lst.Add("3");
lst.Add("4");
lst.Add("5");
MessageBox.Show(comboBox.SelectedIndex.ToString()); // -1
comboBox.ItemsSource = lst;
comboBox.Text = "3";
MessageBox.Show(comboBox.SelectedIndex.ToString()); // 2

Now when I tried to set IsTextSearchEnabled = false, the ComboBox's SelectedIndex doesn't get updated when its Text changes.

List<string> lst = new List<string>();
lst.Add("1");
lst.Add("2");
lst.Add("3");
lst.Add("4");
lst.Add("5");
MessageBox.Show(comboBox.SelectedIndex.ToString()); // -1
comboBox.IsTextSearchEnabled = false;
comboBox.ItemsSource = lst;
comboBox.Text = "3";
MessageBox.Show(comboBox.SelectedIndex.ToString()); // -1

I wonder if there is a way to achieve both (i.e disabling Auto Complete feature and still have ComboBox update its SelectedIndex automatically when its Text is changed)

Upvotes: 1

Views: 97

Answers (1)

Rekshino
Rekshino

Reputation: 7325

There are several ways to reach it. In your case with strings it's enough to set not the Text property, but SelectedValue:

List<string> lst = new List<string>();
lst.Add("1");
lst.Add("2");
lst.Add("3");
lst.Add("4");
lst.Add("5");
MessageBox.Show(comboBox.SelectedIndex.ToString()); // -1
comboBox.IsTextSearchEnabled = false;
comboBox.ItemsSource = lst;
comboBox.SelectedValue = "3";
MessageBox.Show(comboBox.SelectedIndex.ToString()); // 2

If you have more complex data type as string, then you can set also SelectedValuePath or search it by yourself in ItemsSource in event handler for TextInput and set the ´SelectedItem´.

Upvotes: 1

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