Winforms — multi select dropdown list

Question

I\'m shopping around for a dropdown list control that allows me to select multiple items. Something akin to the CheckedListbox, but in dropdown list form (I don\'t want it

Answer 1

Here is another solution which works better for me from a UI perspective, I find the UI more refined and code easier to use/understand:

https://www.codeproject.com/Articles/31105/A-ComboBox-with-a-CheckedListBox-as-a-Dropdown

Note there are a couple of fixes required to avoid the double click issue which can be found in the comments. Quoting from Herrpel (9-May-17)

Add this to the outer class CheckedComboBox

protected override void OnMouseDown(MouseEventArgs e)
{
    base.OnMouseDown(e);
    DroppedDown = false;
}

and for the Windows 10 losing focus on closing the box issue, change the code in CloseDropdown: from

ccbParent.Focus();
this.Hide();

to

ccbParent.BeginInvoke(new MethodInvoker(() => this.Hide()));