从ListBox删除项目时C＃程序崩溃

Question

I am using a BindingList as a datasource for my ListBox.

    public static BindingList<memo> memosList = new BindingList<memo>();

Whenever I attempt to remove the selected object (via a button), my program crashes.

    private void editMemo_Click(object sender, EventArgs e)
    {
        listBox1.Items.Remove(listBox1.SelectedItem);
    }

I get the following error:

An unhandled exception of type 'System.ArgumentException' occurred in System.Windows.Forms.dll

Additional information: Items collection cannot be modified when the DataSource property is set.

I have also tried to use:

    private void editMemo_Click(object sender, EventArgs e)
    {
        Form2.memosList.Remove(listBox1.SelectedIndex);
    }

however this will not allow me to compile.

What can I do to remove the item without throwing an exception?

Answer 1

You should remove the item from the BindingList that you have binded to the DataSource of your list

private void editMemo_Click(object sender, EventArgs e)
{
    if(listBox1.SelectedItem != null)
    {
        BindingList<memo> bl = listBox1.DataSource as BindingList<memo>;
        bl.Remove(listBox1.SelectedItem as memo) ;
    }
}