zj-Exercise/C#/WindowsFormsListBox/Form1.cs

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

        //添加按钮
        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text == "")
            {
                MessageBox.Show("请输入要添加的数据");
            }
            else
            {
                listBox1.Items.Add(textBox1.Text);
                textBox1.Text = "";
            }
        }

        //删除按钮
        private void button2_Click(object sender, EventArgs e)
        {
            if(listBox1.SelectedItems.Count == 0)
            {
                MessageBox.Show("请选择要删除的项目");
            }
            else
            {
                listBox1.Items.Remove(listBox1.SelectedItem);
            }
        }
    }
}