Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PICGEN
{
    public partial class Form1 : Form
    {
        string path = "";
        string currentpic = "";

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            label1.Text = folderBrowserDialog1.SelectedPath;
            path = folderBrowserDialog1.SelectedPath;
            if (path == "") return;
            DirectoryInfo root = new DirectoryInfo(folderBrowserDialog1.SelectedPath);
            FileInfo[] pics = root.GetFiles("*.png");

            listOld.Items.Clear();
            for (int i = 0; i < pics.Length; i++)
            {
                listOld.Items.Add(pics[i].Name);
            }

        }

        private void button2_Click(object sender, EventArgs e)
        {
            //翻转
            Bitmap Img = new Bitmap(folderBrowserDialog1.SelectedPath + "//" + currentpic);
            Img.RotateFlip(RotateFlipType.Rotate180FlipY);
            pictureBox1.Image = Img;
            this.Refresh();
        }

        private void listOld_SelectedIndexChanged(object sender, EventArgs e)
        {
            currentpic = listOld.SelectedItem.ToString();
            Bitmap Img = new Bitmap(folderBrowserDialog1.SelectedPath + "//" + currentpic);
            // Img.RotateFlip(RotateFlipType.Rotate180FlipY);
            pictureBox1.Image = Img;
            this.Refresh();
        }