CheckedListBox allowing only one item to be checked

问题

In my CheckedListBox app I want to allow only a single item to be checked.

I have these properties already set

checkOnClick = true;
SelectionMode = One;

Any advise will be appreciated

回答1:

uncheck all other items in ItemCheck event as below :

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e) {
      for (int ix = 0; ix < checkedListBox1.Items.Count; ++ix)
        if (ix != e.Index) checkedListBox1.SetItemChecked(ix, false);
    }

回答2:

the best way to do this is like this:

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    if (e.NewValue == CheckState.Checked && checkedListBox1.CheckedItems.Count > 0)
    {
        checkedListBox1.ItemCheck -= checkedListBox1_ItemCheck;
        checkedListBox1.SetItemChecked(checkedListBox1.CheckedIndices[0], false);
        checkedListBox1.ItemCheck += checkedListBox1_ItemCheck;
    }
}

no looping is always better.

来源：https://stackoverflow.com/questions/10553323/checkedlistbox-allowing-only-one-item-to-be-checked