using System;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //全部移动：左->右
        private void button1_Click(object sender, EventArgs e)
        {
            foreach (object o in checkedListBox1.Items)
            {
                checkedListBox2.Items.Add(o);
            }
            checkedListBox1.Items.Clear();
        }

        //只移动选中项：左->右
        private void button2_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < checkedListBox1.Items.Count; i++)
            {
                if (checkedListBox1.GetItemChecked(i))
                {
                    checkedListBox2.Items.Add(checkedListBox1.Items[i]);
                }
            }

            //清理左侧checkedListBox中已选中的项
            for (int j = 0; j < checkedListBox1.Items.Count; j++)
            {
                //要判断Checkbox是否被选中，不能用checkedListBox1.SelectedItems
                if (checkedListBox1.GetItemChecked(j))
                {
                    checkedListBox1.Items.Remove(checkedListBox1.Items[j]);
                    //列表中移除一个元素后，需要重新循环查找
                    j = -1;
                }
            }
        }

        //只移动选中项：右->左
        private void button3_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < checkedListBox2.Items.Count; i++)
            {
                if (checkedListBox2.GetItemChecked(i))
                {
                    checkedListBox1.Items.Add(checkedListBox2.Items[i]);
                }
            }

            //清理左侧checkedListBox中已选中的项
            for (int j = 0; j < checkedListBox2.Items.Count; j++)
            {
                if (checkedListBox2.GetItemChecked(j))
                {
                    checkedListBox2.Items.Remove(checkedListBox2.Items[j]);
                    //列表中移除一个元素后，需要重新循环查找
                    j = -1;
                }
            }
        }

        //全部移动：右->左
        private void button4_Click(object sender, EventArgs e)
        {
            foreach (object o in checkedListBox2.Items)
            {
                checkedListBox1.Items.Add(o);
            }
            checkedListBox2.Items.Clear();
        }
    }
}