Question

在C#中，我想用button按钮来实现picturebox控件的随机选图，我想在D:\数字密码 中随机选图片

按一次button1控

件，picturebox控件在 D:\数字密码 中 随机选一张图片

Answer 1

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.IO;

namespace WinFormRandomPic
{
    public partial class Form1 : Form
    {
        private readonly string PicDir = @"D:\数字密码\";
        private List<string> picFiles;
        public Form1()
        {
            InitializeComponent();
            picFiles = new List<string>();
            picFiles.AddRange(Directory.GetFiles(PicDir, "*.jpg"));
            picFiles.AddRange(Directory.GetFiles(PicDir, "*.bmp"));
            picFiles.AddRange(Directory.GetFiles(PicDir, "*.png"));
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Random rd = new Random();
            int index = rd.Next(0, picFiles.Count);
            pictureBox1.Image = Image.FromFile(picFiles[index]);
        }
    }
}