CODEWITHSUNDEEP
c#wpf
Bob Wintemberg
Bob Wintemberg

Reputation: 3252

Programmatically Clear Selection in WPF ComboBox

I have a ComboBox in WPF whose ItemsSource is set to a list programmatically. How would I go about clearing the selection in an event handler? I've tried:

comboBox.SelectedIndex = -1;
comboBox.SelectedItem = null;
comboBox.SelectedValue = null;
comboBox.SelectedValue = "";

None of them have any effect.

Upvotes: 20

Views: 33123

Answers (8)

Chow
Chow

Reputation: 13

Really old question, but here's what you can do if you are data binding from View Model and don't want to interact with the code-behind.

If the Combobox item source is a List<string> and the selected item is string, then simply set the binded selected item variable to null, notify change, then set to String.Empty.

Upvotes: 0

eng abbas mohamed
eng abbas mohamed

Reputation: 1

first, you must do this in the selectionchange function

private void combobox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

            if (combobox.SelectedIndex == -1)
            {
               combobox.SelectedIndex.ToString();
            }
            else
            {
                string datacombo=(combobox.SelectedValue.ToString());
            }
             

        }

after that use it anywhere combobox.SelectedIndex=-1. now I am using another combobox to select on selection change

 private void cbocombobox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            combobox.SelectedValue=null;
            combobox.SelectedIndex = -1; 
        }

and it worked for me alhamdulillah

Upvotes: 0

Wrmcodeblocks
Wrmcodeblocks

Reputation: 46

ComboBox.SelectedIndex = -1 did not work for me, perhaps because I am using a custom ControlTemplate in a custom ComboBox?? Anyway, reseting the ItemsSource does work. I am calling this from a Behavior.

            var items = comboBox.ItemsSource;
            comboBox.ItemsSource = null;
            comboBox.ItemsSource = items;

Upvotes: 0

Juan Hernandez Ortiz
Juan Hernandez Ortiz

Reputation: 1

In the following example I show the way it worked for me, this for a ComboBox from a user control:

Combobox in the usercontrol:

<ComboBox x:Name="OFFSE_INI_CMBX" HorizontalAlignment="Left" Margin="26,106,0,0" VerticalAlignment="Top" Height="20" Width="100" DropDownClosed="OFFSE_INI_CMBX_DropDownClosed">
        <ComboBoxItem x:Name="NV" Content="           NV" ToolTip="Sub Command &#10;Tooltip 1" Height="20" Selected="NV_Selected"></ComboBoxItem>
    </ComboBox>

Function that works

private void OFFSE_INI_CMBX_DropDownClosed(object sender, EventArgs e)
    {
        this.OFFSE_INI_CMBX.SelectedIndex = -1;
        this.OFFSE_INI_CMBX.Text = "";
    }

Upvotes: 0

Shashika
Shashika

Reputation: 219

I want to clear the ComboBox in DropDownClosed event of another ComboBox. Therefore I used following code inside of first ComboBox DropDownClosed event

private void comboBox1_DropDownClosed(object sender, EventArgs e)
{
  this.comboBox.ItemsSource = null;
}

Upvotes: 1

laktak
laktak

Reputation: 60003

comboBox.SelectedIndex = -1; works for me.

Are you doing anything else in your event handler? Are you using databinding?

Upvotes: 33

Andrew Milford
Andrew Milford

Reputation: 41

I found that I needed to also add:

comboBox.Text = "";

to get the text to clear

Upvotes: 4

configurator
configurator

Reputation: 41620

comboBox.SelectedIndex = -1;

Is the way to go. I don't know why it doesn't work for you; perhaps an event handler for SelectedIndexChanged changes the value?

Upvotes: 5

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