C# 实现图片转换器

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Imaging;

using System.IO;



namespace Ex04_09

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            openFileDialog1.Filter = "*.jpg,*.jpeg,*.bmp,*.gif,*.ico,*.png,*.tif,*.wmf|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf";

            openFileDialog1.Title = "打开图片文件";

            openFileDialog1.Multiselect = false;

            openFileDialog1.ShowDialog();

            listBox1.Items.Add(openFileDialog1.FileName);

        }



        private void button2_Click(object sender, EventArgs e)

        {

            if (comboBox1.SelectedItem == null)

            {

                return;

            }

            else

            {

                for (int i = 0; i < listBox1.Items.Count; i++)

                {

                    Bitmap bitmap = new Bitmap(listBox1.Items[i].ToString());

                    string fileName = listBox1.Items[i].ToString().Substring(0, listBox1.Items[i].ToString().LastIndexOf("//") + 1) 

                        + listBox1.Items[i].ToString().Substring(listBox1.Items[i].ToString().LastIndexOf("//") + 1, 

                        listBox1.Items[i].ToString().LastIndexOf(".") - listBox1.Items[i].ToString().LastIndexOf("//") - 1);

                    switch (comboBox1.Text)

                    {

                        case "*.bmp":

                            bitmap.Save(fileName + ".bmp", ImageFormat.Bmp);

                            break;

                        case "*.jpg":

                            bitmap.Save(fileName + ".jpg", ImageFormat.Jpeg);

                            break;

                        case "*.gif":

                            bitmap.Save(fileName + ".gif", ImageFormat.Gif);

                            break;

                        case "*.tif":

                            bitmap.Save(fileName + ".tif", ImageFormat.Tiff);

                            break;

                        case "*.png":

                            bitmap.Save(fileName + ".png", ImageFormat.Png);

                            break;

                        case "*.wmf":

                            bitmap.Save(fileName + ".wmf", ImageFormat.Wmf);

                            break;

                        //case "*.ico":

                        //    bitmap.Save(fileName + ".ico", ImageFormat.Wmf);

                        //    break;

                    }

                }

                MessageBox.Show("转换完成", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

        }

    }

}