public partial class Form1 : Form{FileInfoList fileList;public Form1(){InitializeComponent();}private void 加载文件ToolStripMenuItem_Click(object sender, EventArgs e){FolderBrowserDialog dlg = new FolderBrowserDialog();if (dlg.ShowDialog() == DialogResult.OK){string[] filespath = Directory.GetFiles(dlg.SelectedPath);fileList = new FileInfoList(filespath);InitListView();}}private void InitListView(){listView1.Items.Clear();this.listView1.BeginUpdate();foreach (FileInfoWithIcon file in fileList.list){ListViewItem item = new ListViewItem();item.Text = file.fileInfo.Name.Split('.')[0];item.ImageIndex = file.iconIndex;item.SubItems.Add(file.fileInfo.LastWriteTime.ToString());item.SubItems.Add(file.fileInfo.Extension.Replace(".",""));item.SubItems.Add(string.Format(("{0:N0}"), file.fileInfo.Length));listView1.Items.Add(item);}listView1.LargeImageList = fileList.imageListLargeIcon;listView1.SmallImageList = fileList.imageListSmallIcon;listView1.Show();this.listView1.EndUpdate();}private void 大图标ToolStripMenuItem_Click(object sender, EventArgs e){listView1.View = View.LargeIcon;}private void 小图标ToolStripMenuItem_Click(object sender, EventArgs e){listView1.View = View.SmallIcon;}private void 平铺ToolStripMenuItem_Click(object sender, EventArgs e){listView1.View = View.Tile;}private void 列表ToolStripMenuItem_Click(object sender, EventArgs e){listView1.View = View.List;}private void 详细信息ToolStripMenuItem_Click(object sender, EventArgs e){listView1.View = View.Details;}}

public static class GetSystemIcon{/// <summary>/// 依据文件名读取图标，若指定文件不存在，则返回空值。  /// </summary>/// <param name="fileName">文件路径</param>/// <param name="isLarge">是否返回大图标</param>/// <returns></returns>public static Icon GetIconByFileName(string fileName, bool isLarge = true){int[] phiconLarge = new int[1];int[] phiconSmall = new int[1];//文件名 图标索引 Win32.ExtractIconEx(fileName, 0, phiconLarge, phiconSmall, 1);IntPtr IconHnd = new IntPtr(isLarge ? phiconLarge[0] : phiconSmall[0]);if (IconHnd.ToString() == "0")return null;return Icon.FromHandle(IconHnd);}/// <summary>  /// 根据文件扩展名（如:.*），返回与之关联的图标。/// 若不以"."开头则返回文件夹的图标。  /// </summary>  /// <param name="fileType">文件扩展名</param>  /// <param name="isLarge">是否返回大图标</param>  /// <returns></returns>  public static Icon GetIconByFileType(string fileType, bool isLarge){if (fileType == null || fileType.Equals(string.Empty)) return null;RegistryKey regVersion = null;string regFileType = null;string regIconString = null;string systemDirectory = Environment.SystemDirectory + "\\";if (fileType[0] == '.'){//读系统注册表中文件类型信息  regVersion = Registry.ClassesRoot.OpenSubKey(fileType, false);if (regVersion != null){regFileType = regVersion.GetValue("") as string;regVersion.Close();regVersion = Registry.ClassesRoot.OpenSubKey(regFileType + @"\DefaultIcon", false);if (regVersion != null){regIconString = regVersion.GetValue("") as string;regVersion.Close();}}if (regIconString == null){//没有读取到文件类型注册信息，指定为未知文件类型的图标  regIconString = systemDirectory + "shell32.dll,0";}}else{//直接指定为文件夹图标  regIconString = systemDirectory + "shell32.dll,3";}string[] fileIcon = regIconString.Split(new char[] { ',' });if (fileIcon.Length != 2){//系统注册表中注册的标图不能直接提取，则返回可执行文件的通用图标  fileIcon = new string[] { systemDirectory + "shell32.dll", "2" };}Icon resultIcon = null;try{//调用API方法读取图标  int[] phiconLarge = new int[1];int[] phiconSmall = new int[1];uint count = Win32.ExtractIconEx(fileIcon[0], Int32.Parse(fileIcon[1]), phiconLarge, phiconSmall, 1);IntPtr IconHnd = new IntPtr(isLarge ? phiconLarge[0] : phiconSmall[0]);resultIcon = Icon.FromHandle(IconHnd);}catch { }return resultIcon;}}/// <summary>  /// 定义调用的API方法  /// </summary>  class Win32{[DllImport("shell32.dll")]public static extern uint ExtractIconEx(string lpszFile, int nIconIndex, int[] phiconLarge, int[] phiconSmall, uint nIcons);}