formcheckedlistbox.cs

来自「csharp课本的源代码」· CS 代码 · 共 60 行

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace CheckedListBoxExample
{
    public partial class FormCheckedListBox : Form
    {
        public FormCheckedListBox()
        {
            InitializeComponent();
        }

        private void buttonOK_Click(object sender, EventArgs e)
        {
            string mystr = "您所选择的课程是：";
            // checkedListBox1.CheckedItems.Count是用户选择项目的个数
            int checkedNumber = checkedListBox1.CheckedItems.Count;
            if (checkedNumber == 0)
            {
                MessageBox.Show("您还没有选择任何课程！");
            }
            else
            {
                for (int i = 0; i < checkedNumber; i++)
                {
                    // checkedListBox1.CheckedItems[i]是用户选中项集合中的第i项
                    mystr += checkedListBox1.CheckedItems[i] + " ; ";
                }
                //如果尾部有分号，则将尾部的分号变为叹号
                if (mystr[mystr.Length - 2] == ';')
                {
                    mystr = mystr.Substring(0, mystr.Length - 2);
                    mystr += "!";
                }
                MessageBox.Show(mystr);
            }

        }

        private void buttonReference_Click(object sender, EventArgs e)
        {
            //取消已经选中的项
            for (int i = 0; i < checkedListBox1.Items.Count; i++)
            {
                checkedListBox1.SetItemChecked(i, false);
                checkedListBox1.SetSelected(i, false);
            }
            //自动添加建议选中的项
            checkedListBox1.SetItemChecked(0, true);
            checkedListBox1.SetItemChecked(3, true);
            checkedListBox1.SetItemChecked(7, true);

        }
    }
}