检查CheckedListBox是否为空

Question

我有一个小表单,用户在其中写入某个项目的名称,然后当他单击"添加"时,有一个语句需要检查checkedListBox中是否已存在相同的项目.

我正在寻找检查列表是空的还是某个项目的"if"语句.

private void button2_Click(object sender, EventArgs e)
{
    foreach (var item in checkedListBox1.Items)
    {
        if (itemName.Text == item.ToString())
        {
            DialogResult result = MessageBox.Show("?", "Question", MessageBoxButtons.YesNoCancel);
            if (result == DialogResult.Yes)
            {
                checkedListBox1.Items.Add(itemName.Text);
            }
            else if (result == DialogResult.No)
            {
                //clear the forms
            }
        }
        else
        {
            checkedListBox1.Items.Add(itemName.Text);
            timeLeft = 2;
            timer1.Start();
        }
    }
}
        //checkedListBox1.Items.Add(itemName.Text);
        //timeLeft = 2;
        //timer1.Start();

Answer 1

if(checkedListBox1.Items.Count > 0) {
     // It contains items
} else {
     // It doesn't
}

编辑:用于检查CheckedListBox是否为空,然后

if(checkedListBox1.Items.Contains(theItemToCheck)) {
     // The item is already in the CheckedListBox
}

是检查项目是否已经在CheckedListBox中.