IShellFolder.cs

[DllImport("shell32.dll")]
        public static extern Int32 SHGetDesktopFolder(out IntPtr ppshf);

/// <summary>
        /// 获得桌面 Shell
        /// </summary>
        public static IShellFolder GetDesktopFolder(out IntPtr ppshf)
        {
            SHGetDesktopFolder(out ppshf);
            Object obj = Marshal.GetObjectForIUnknown(ppshf);
            return (IShellFolder)obj;
        }

//获得桌面 PIDL
            IntPtr desktopPtr;
            IShellFolder desktop = API.GetDesktopFolder(out desktopPtr);

void ParseDisplayName(
            IntPtr hwnd,
            IntPtr pbc,
            [MarshalAs(UnmanagedType.LPWStr)] string pszDisplayName,
            out uint pchEaten,
            out IntPtr ppidl,
            ref uint pdwAttributes);

void BindToObject(
            IntPtr pidl,
            IntPtr pbc,
            [In()] ref Guid riid,
            out IShellFolder ppv);

//获取 C 盘的 PIDL
            string FolderPath = @"C:\";
            IntPtr Pidl = IntPtr.Zero;
            IShellFolder Root;
            uint i, j = 0;
            desktop.ParseDisplayName(Handle, IntPtr.Zero, FolderPath, out i, out Pidl, ref j);
            desktop.BindToObject(Pidl, IntPtr.Zero, ref Guids.IID_IShellFolder, out Root);

[PreserveSig]
        int EnumObjects(IntPtr hWnd, SHCONTF flags, out IntPtr enumIDList);

//循环查找 C 盘下面的文件/文件夹的 PIDL
            IEnumIDList fileEnum = null;
            IEnumIDList folderEnum = null;
            IntPtr fileEnumPtr = IntPtr.Zero;
            IntPtr folderEnumPtr = IntPtr.Zero;
            IntPtr pidlSub;
            int celtFetched;

            //获取子文件夹
            if (Root.EnumObjects(this.Handle, SHCONTF.FOLDERS | SHCONTF.INCLUDEHIDDEN, out fileEnumPtr) == API.S_OK)
            {
                fileEnum = (IEnumIDList)Marshal.GetObjectForIUnknown(fileEnumPtr);
                while (fileEnum.Next(1, out pidlSub, out celtFetched) == 0 && celtFetched == API.S_FALSE)
                {
                    //获取显示名称
                    string name = API.GetNameByPIDL(pidlSub);
                    lvFile.Items.Add(name, 1);
                }
            }

            //获取子文件
            if (Root.EnumObjects(this.Handle, SHCONTF.NONFOLDERS | SHCONTF.INCLUDEHIDDEN, out folderEnumPtr) == API.S_OK)
            {
                folderEnum = (IEnumIDList)Marshal.GetObjectForIUnknown(folderEnumPtr);
                while (folderEnum.Next(1, out pidlSub, out celtFetched) == 0 && celtFetched == API.S_FALSE)
                {
                    string name = API.GetNameByPIDL(pidlSub);
                    lvFile.Items.Add(name, 0);
                }
            }