实现效果：

注意：using system.io; 往Form1上添加控件picturebox，再添加imagelist，并设置imagelist的imagesize大小

Form1.cs代码：

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;using System.IO;namespace ImageCheck{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } int index; private void button1_Click(object sender, EventArgs e) { index--; if (index<0) { MessageBox.Show("去往最后一张图片"); index = imageList1.Images.Count - 1; } this.pictureBox1.Image = this.imageList1.Images[index]; } private void button2_Click(object sender, EventArgs e) { index++; if (index>imageList1.Images.Count-1) { MessageBox.Show("回到第一张图片"); index = 0; } this.pictureBox1.Image = this.imageList1.Images[index]; } private void LoadImage() { string rootPath = Application.StartupPath; string filePath = rootPath + @"\image"; DirectoryInfo rootDir = new DirectoryInfo(filePath); FileInfo[] file = rootDir.GetFiles(); for (int i=0;i<=file.Length-1;i++) { Image img = Image.FromFile(file[i].FullName); this.imageList1.Images.Add(img); } } private void Form1_Load(object sender, EventArgs e) { LoadImage(); this.pictureBox1.Image = this.imageList1.Images[index]; } }}

注意：在C#的工作目录Debug下创建image文件夹，并放置图片