自定义 CheckedListBox 的 Item.Clear()

Question

I am looking to customize Item.Clear() of the CheckedListBox and I have been working on this for some time but am unable to access the Clear Method to override it. The below code returns no suitable Method found to override.

public partial class cLBEx : CheckedListBox
{
    public cLBEx()
    {
        InitializeComponent();
    }

    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);
    }

    public override void Clear()
    {

    }

}

Any assistance would be much appreciated

Answer 1

Because my comment on the last answer was deleted with the post:

Clear Method is Part of ListBox.ObjectCollection that's why you cant override it in any subclassed CheckedListBox or ListBox Types. You have to subclass ListBox.ObjectCollection and then Subclass CheckedListBox to change the Type of the underlying Item Property.

Edit, for a smarter and quicker way, you can use an Extensionmethod like

public static void ClearCollection(this ListBox.ObjectCollection list) {
 // do work!
}