C#图片查看器实现方法

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