.NET编程——利用C#显示图片(WinForm)

目录

前言

程序设计

前言

在Visual Studio下用C#实现导入图片并显示图片，同时可以通过按键来切换图片。

程序设计

功能及使用流程

该程序可实现从文件夹中批量导入图片并显示。获取图片左侧显示图片列表，右侧显示列表中选中的图片，也可通过按键选择上一张以及下一张图片。

界面

控件选择

1.三个button分别负责打开图片文件夹、上一张和下一张；

2.一个ListBox负责显示图片列表；

3.一个PictureBox负责显示图片。

单击控件——打开图片文件夹

private void btnStart_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();  //ofd类
            ofd.Title = "获取图片";  //窗口名
            ofd.InitialDirectory = @"D:\"; //打开的路径
            ofd.Multiselect = true;  //是否允许多选
            ofd.Filter = "图片文件|*.jpg|所有文件|*.*"; //支持的文件格式
            ofd.ShowDialog();  //打开选择窗口
            string[] picturePath = ofd.FileNames;  //将选择的图片的路径存储到picturePath
            listPicture.Items.Clear();  //清空窗口
            for (int i = 0; i < picturePath.Length; i++)
            {
                listPicture.Items.Add(Path.GetFileName(picturePath[i]));  //显示图片名
                strListPicture.Add(picturePath[i]);  //储存图片路径
            }
            if (listPicture.Items.Count != 0)
            {
                Bitmap picture = new Bitmap(picturePath[0]);  //显示第一张图片
                pictureBox.Image = picture;
            }
        }

 双击控件——显示所选图片

private void listPicture_DoubleClick(object sender, EventArgs e)
        {
            Bitmap picture = new Bitmap(strListPicture[listPicture.SelectedIndex]);
            pictureBox.Image = picture;
        }

单击控件——上一张

private void btnUp_Click(object sender, EventArgs e)
        {
            try
            {
                int index = listPicture.SelectedIndex;  //获取当前选择选项索引
                index--;  //索引指向上一张图片
                if (index == -1)
                {
                    index = listPicture.Items.Count - 1;  //从尾开始
                }
                listPicture.SelectedIndex = index;  //改变索引后改变选项索引
                Bitmap picture = new Bitmap(strListPicture[index]);
                pictureBox.Image = picture;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            
        }

<同理可实现单击控件下一张> 

源码

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 picture
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 用来存放图片的全路径的泛型
        List<string> strListPicture = new List<string>();
        private void btnStart_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();  //ofd类
            ofd.Title = "获取图片";  //窗口名
            ofd.InitialDirectory = @"D:\"; //打开的路径
            ofd.Multiselect = true;  //是否允许多选
            ofd.Filter = "图片文件|*.jpg|所有文件|*.*"; //支持的文件格式
            ofd.ShowDialog();  //打开选择窗口
            string[] picturePath = ofd.FileNames;  //将选择的图片的路径存储到picturePath
            listPicture.Items.Clear();  //清空窗口
            for (int i = 0; i < picturePath.Length; i++)
            {
                listPicture.Items.Add(Path.GetFileName(picturePath[i]));  //显示图片名
                strListPicture.Add(picturePath[i]);  //储存图片路径
            }
            if (listPicture.Items.Count != 0)
            {
                Bitmap picture = new Bitmap(picturePath[0]);  //显示第一张图片
                pictureBox.Image = picture;
            }
        }
        /// <summary>
        /// 实现双击显示图片
        /// </summary>
        private void listPicture_DoubleClick(object sender, EventArgs e)
        {
            Bitmap picture = new Bitmap(strListPicture[listPicture.SelectedIndex]);
            pictureBox.Image = picture;
        }

        private void btnUp_Click(object sender, EventArgs e)
        {
            try
            {
                int index = listPicture.SelectedIndex;  //获取当前选择选项索引
                index--;  //索引指向上一张图片
                if (index == -1)
                {
                    index = listPicture.Items.Count - 1;  //从尾开始
                }
                listPicture.SelectedIndex = index;  //改变索引后改变选项索引
                Bitmap picture = new Bitmap(strListPicture[index]);
                pictureBox.Image = picture;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            
        }

        private void btnDown_Click(object sender, EventArgs e)
        {
            try
            {
                int index = listPicture.SelectedIndex;  //获取当前选项索引
                index++;  //索引指向下一张图片
                if (index == listPicture.Items.Count)
                {
                    index = 0;  //从头开始
                }
                listPicture.SelectedIndex = index;  //改变索引后改变选项索引
                Bitmap picture = new Bitmap(strListPicture[index]);
                pictureBox.Image = picture;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}