C# 例9-12 p255 9-10

9-12

演示

代码

源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace UseListBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void btnRight_Click(object sender, EventArgs e)
        {
            if(lstLeft.SelectedItems.Count == 0)
            {
                return;
            }
            else
            {
                lstRight.Items.Add(lstLeft.SelectedItem);
                lstBottom.Items.Add(lstLeft.SelectedItem.ToString() + "被移至右侧");
                lstLeft.Items.Remove(lstLeft.SelectedItem);
            }
        }
        private void btnRightAll_Click(object sender, EventArgs e)
        {
            foreach(object item in lstLeft.Items)
            {
                lstRight.Items.Add(item);
            }
            lstBottom.Items.Add("左侧列表项被全部移至右侧");
            lstLeft.Items.Clear();
        }
        private void btnLeft_Click(object sender, EventArgs e)
        {
            if(lstRight.Items.Count == 0)
            {
                return;
            }
            else
            {
                lstLeft.Items.Add(lstRight.SelectedItem);
                lstBottom.Items.Add(lstRight.SelectedItem.ToString() + "被移至左侧");
                lstRight.Items.Remove(lstRight.SelectedItem);
            }
        }
        private void btnLeftAll_Click(object sender, EventArgs e)
        {
            foreach(object item in lstRight.Items)
            {
                lstLeft.Items.Add(item);
            }
            lstBottom.Items.Add("右侧列表项被全部移至左侧");
            lstRight.Items.Clear();
        }
    }
}

9-10

演示

代码

源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace UseListBoxAndTextBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            lstStudent.SelectedIndex = 0;
        }
        private void btnOk_Click(object sender, EventArgs e)
        {
            switch (lstStudent.SelectedIndex)
            {
                case 0:
                    this.txtClas.Text = "一班";
                    break;
                case 1:
                    this.txtClas.Text = "二班";
                    break;
                case 2:
                    this.txtClas.Text = "三班";
                    break;
                case 3:
                    this.txtClas.Text = "四班";
                    break;
                case 4:
                    this.txtClas.Text = "五班";
                    break;
                case 5:
                    this.txtClas.Text = "六班";
                    break;
                case 6:
                    this.txtClas.Text = "七班";
                    break;
                case 7:
                    this.txtClas.Text = "八班";
                    break;
                case 8:
                    this.txtClas.Text = "九班";
                    break;
                case 9:
                    this.txtClas.Text = "十班";
                    break;
                case 10:
                    this.txtClas.Text = "十一班";
                    break;
                case 11:
                    this.txtClas.Text = "十二班";
                    break;
                default:
                    this.txtClas.Clear();
                    break;
            }
        }
    }
}