Form1.cs

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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;

//添加命名空间
using System.IO;                   //Directory目录
using System.Diagnostics;          //Stopwatch显示时间

namespace GetPictureList
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 下载于www.51aspx.com
        //打开图片
        private void button1_Click(object sender, EventArgs e)
        {
            //设置打开文件控件
            OpenFileDialog openfile = new OpenFileDialog();
            openfile.Filter = "JPG(*.JPG;*.JPEG);gif文件(*.GIF);BMP文件(*.BMP);PNG文件(*.PNG)|*.jpg;*.jpeg;*.gif;*.bmp;*.png";
            openfile.FilterIndex = 1;  //当前选定索引
            openfile.RestoreDirectory = true;
            openfile.FileName = "";
            //对话框选择确定按钮
            if (openfile.ShowDialog() == DialogResult.OK)
            {
                //FromFile从指定的文件创建Image
                pictureBox1.Image = Image.FromFile(openfile.FileName);
                //图片被拉伸或收缩适合pictureBox大小
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;               
            }
        }

        //定义变量
        private string folderDirPath;                            //图片文件夹地址
        private string picDirPath = null;                        //图片路径
        private List<string> imagePathList = new List<string>(); //获取列表图片路径
        private int index;                                       //获取选中列表图片序号

        //ListView和imageList显示图片列表
        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                //打开选择文件夹对话框
                FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();
                DialogResult result = folderBrowserDialog.ShowDialog();
                if (result == DialogResult.OK)
                {
                    //获取用户选择的文件夹路径
                    this.folderDirPath = folderBrowserDialog.SelectedPath;