如何在检查列表框中获取当前的检查项目

Question

我有一个列表框，我试图在ItemCheck Handler中获取当前选中的项目，但我无法->我可以使用属性chckdLstBox_Metabolites.CheckedItems获取CheckedItems列表，但是我如何获取刚刚检查过的项目？ ???

Answer 1

You can use the event's ItemCheckEventArgs:

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
    {
        //Note: MessageBox is for demo use only 
        MessageBox.Show("Selected Index: " + e.Index.ToString());
        MessageBox.Show("Current Value: " + e.CurrentValue.ToString());
        MessageBox.Show("New Value: " + e.NewValue.ToString());
        //Getting the item would be:
        string currentItem = (string)this.checkedListBox1.Items[e.Index];
        MessageBox.Show("Current Item: " + currentItem);
    } 

Answer 2

The ItemCheckEventArgs argument in your handler will give you the index of the item that is going to have its status changed. It has properties for the current value as well as a property to get or set the new value.

To get the item itself, you can use a line of code like below.

object o = checkedListBox1.Items[e.Index]; // e is ItemCheckEventArgs