有没有一种方法可以将属性列表框保存到列表框

Question

我正在用列表填充listbox1。数据可以发送到第二个列表框2，然后返回。

如何保存属性设置？当您尝试代码时，会出现以下错误：

System.ArgumentException：'设置了DataSource属性后，无法修改项目集合。'

它与listbox1.items.clear（）;有关。正确的设置方法是什么？

public partial class Form1 : Form
    {
    List<string> l2;
    string selectedItemText;
    int SelectedIndex;  

    public Form1()
    {
        InitializeComponent();           

        l2 = new List<string>();
        l2.Add("1");
        l2.Add("2");
        l2.Add("3");
        l2.Add("4");
        l2.Add("5");

        listBox1.DataSource = l2;
    }

    private void Form1_Load(object sender, EventArgs e)
    {         
        listBox1.Items.Clear();
        foreach (object item in Properties.Settings.Default.listSave)
        {
            listBox1.Items.Add(item);
        }

        listBox2.Items.Clear();
        foreach (object item in Properties.Settings.Default.listSave2)
        {
            listBox2.Items.Add(item);
        }            
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close();

        Properties.Settings.Default.listSave.Clear();
        Properties.Settings.Default.listSave2.Clear();

        foreach (object item in listBox1.Items)
        {
            Properties.Settings.Default.listSave.Add(item.ToString());
        }

        foreach (object item in listBox2.Items)
        {
            Properties.Settings.Default.listSave2.Add(item.ToString());
        }
        Properties.Settings.Default.Save();          

    }

    private void button2_Click_1(object sender, EventArgs e)
    {
        selectedItemText = listBox1.SelectedItem.ToString();
        SelectedIndex = listBox1.SelectedIndex;

        listBox2.Items.Add(selectedItemText);

        if (l2 != null)
        {
            l2.RemoveAt(SelectedIndex);
        }

        DataBindings();
    }

    private void DataBindings()
    {
        listBox1.DataSource = null;
        listBox1.DataSource = l2;

    }

    private void button4_Click(object sender, EventArgs e)
    {
        selectedItemText = listBox2.SelectedItem.ToString();
        SelectedIndex = listBox2.SelectedIndex;
        l2.Add(selectedItemText);

        listBox2.Items.RemoveAt(listBox2.Items.IndexOf(listBox2.SelectedItem));

        DataBindings();
    }
}