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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace EditImageDPI
{
    public partial class MainForm : Form
    {
        private List<string> _fileList = new List<string>();
        private int _newDpiWidth = 0;
        private int _newDpiHeight = 0;
        private string _saveFold = string.Empty;
        private static object lockObject = new object();

        public MainForm()
        {
            InitializeComponent();
        }

        private void OpenOToolStripButton_Click(object sender, EventArgs e)
        {
            try
            {
                if (openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    if (openFileDialog1.FileNames.Length > 0)
                    {
                        InitByOpen();
                        foreach (string fileName in openFileDialog1.FileNames)
                        {
                            _fileList.Add(fileName);
                            FileInfo file = new FileInfo(fileName);
                            ListViewItem item = new ListViewItem(file.FullName);
                            item.SubItems.Add(Convert.ToString((file.Length / 1024))   "KB");
                            item.SubItems.Add(file.Extension.Replace(".", ""));
                            listViewFile.Items.Add(item);
                        }
                        GC.Collect();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message,"错误");
            }
        }

        private void InitByOpen()
        {
            _fileList.Clear();
            listViewFile.Items.Clear();
            progressBar1.Maximum = openFileDialog1.FileNames.Length;
            progressBar1.Step = 1;
            toolStripStatusLabelAll.Text = "All: "  openFileDialog1.FileNames.Length.ToString();
        }

        private void SavetoolStripButton_Click(object sender, EventArgs e)
        {
            try
            {
                if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
                {
                    _saveFold = folderBrowserDialog1.SelectedPath;
                    _newDpiWidth = Convert.ToInt32(toolStripComboBoxDPI_Width.Text);
                    _newDpiHeight = Convert.ToInt32(toolStripComboBoxDPI_Height.Text);
                    foreach (string fileName in _fileList)
                    {
                        EditImageDPIDelegate APM = new EditImageDPIDelegate(EditImageDPI);
                        APM.BeginInvoke(fileName, APM_CallBack, APM);
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误");
            }
        }

        private void EditImageDPI(string fileName)
        {
            lock (lockObject)
            {
                using (Bitmap newImage = new Bitmap(Image.FromFile(fileName)))
                {
                    newImage.SetResolution(_newDpiWidth, _newDpiHeight);
                    newImage.Save(_saveFold   "\\"   GetFileNameByFileFullName(fileName),
                        System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }
        }

        private string GetFileNameByFileFullName(string fullName)
        {
            int tag1 = fullName.LastIndexOf("\\");
            return fullName.Substring(tag1, fullName.Length - tag1);
        }

        private delegate void EditImageDPIDelegate(string fileName);

        private void APM_CallBack(IAsyncResult ar)
        {
            EditImageDPIDelegate APM = (EditImageDPIDelegate)ar.AsyncState;
            APM.EndInvoke(ar);
            this.Invoke(new APM_UpdateUIDelegate(APM_UpdateUI));
        }

        private void APM_UpdateUI()
        {
            progressBar1.PerformStep();
            toolStripStatusLabelNow.Text = "Now: "   progressBar1.Value.ToString();
            if (progressBar1.Value == progressBar1.Maximum)
            {
                MessageBox.Show("批量处理图片DPI成功！","批量处理");
            }
        }
        private delegate void APM_UpdateUIDelegate();
    }
}