"Go" C # ListView instance: File icon display

"Go" C # ListView instance: File icon display

Description: This example displays the files in the catalog in the form's ListView control and defines a variety of view views. An extract of the icon data is implemented by invoking the Win32 library function .

Main program: Large icons:

List:

More information:
Form1.cs:

Public partial class Form1:form {fileinfolist fileList;        Public Form1 () {InitializeComponent (); private void Load file 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 Large icon Toolstripmenuitem_click (object sender, EventArgs e) {Listview1.view = View.lar        Geicon; } private void Small icon Toolstripmenuitem_click (object sender, EventArgs e) {Listview1.view = View.sma        Llicon; private void tile Toolstripmenuitem_click (object sender, EventArgs e) {Listview1.view = View.tile        ; } private void list Toolstripmenuitem_click (object sender, EventArgs e) {Listview1.view = View.list        ; } private void Details Toolstripmenuitem_click (object sender, EventArgs e) {listview1.view = View.Details; }    }

FileInfoList.cs: Description: Storage primarily for background data

Class Fileinfolist {public list<fileinfowithicon> List;        Public ImageList Imagelistlargeicon;        Public ImageList Imagelistsmallicon; <summary>///////To obtain the generated file information according to the file path and extract the file icon///</summary>//<param name= "Filespath" &G T;</param> public fileinfolist (string[] filespath) {list = new List<fileinfowithicon&gt            ;();            Imagelistlargeicon = new ImageList ();            Imagelistlargeicon.imagesize = new Size (32, 32);            Imagelistsmallicon = new ImageList ();            Imagelistsmallicon.imagesize = new Size (16, 16);                foreach (string path in Filespath) {Fileinfowithicon file = new Fileinfowithicon (path);                IMAGELISTLARGEICON.IMAGES.ADD (File.largeicon);                IMAGELISTSMALLICON.IMAGES.ADD (File.smallicon);                File.iconindex = imagelistlargeicon.images.count-1; List.            ADD (file);   }     }} class Fileinfowithicon {public FileInfo FileInfo;        Public Icon LargeIcon;        Public Icon SmallIcon;        public int iconindex;            Public Fileinfowithicon (string path) {fileInfo = new fileInfo (path);            LargeIcon = Getsystemicon.geticonbyfilename (path, true);            if (LargeIcon = = null) LargeIcon = Getsystemicon.geticonbyfiletype (Path.getextension (Path), true);            SmallIcon = Getsystemicon.geticonbyfilename (path, false);        if (SmallIcon = = null) SmallIcon = Getsystemicon.geticonbyfiletype (Path.getextension (Path), false); }    }

Getsystemicon: Description: Defines two ways to get the icon, extracted from the file and from the system resources associated with the file.

public static class Getsystemicon {//<summary>/////////////////or NULL if the specified file does not exist. </summary>//<param name= "fileName" > File path </param>//<param name= "IsLarge" > whether to return  Back to Large Icons </param>///<returns></returns> public static icon Geticonbyfilename (String fileName,            BOOL IsLarge = True) {int[] Phiconlarge = new Int[1];            int[] Phiconsmall = new Int[1];            FileName Icon index 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>///The icon associated with it is returned based on the file name extension (for example:. *). If you do not use "."          The icon for the folder is returned at the beginning. </summary>//<param name= "FileType" > File extension </param>//<param NAMe= "IsLarge" > whether to return large icons </param>//<returns></returns> public static icon Geticonbyfi Letype (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] = = '. ')                {//Read the file type information in the system registry 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) {//Not read to file type registration information, specified as unknown file type                The icon regiconstring = systemdirectory + "shell32.dll,0";  }} else {//directly specified as folder icon regiconstring = Systemdirectory +            "shell32.dll,3";            } string[] Fileicon = Regiconstring.split (new char[] {', '}); if (fileicon.length! = 2) {//The plotting registered in the system registry cannot be extracted directly, then the generic icon for the executable file is returned Fileicon = new St            Ring[] {systemdirectory + "Shell32.dll", "2"};            } Icon Resulticon = null;                try {//Call API Method Read Icon 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>///define the API method called///</summary> class Win32 {[DllImport ("Shell 32.dll ")] public static extern uint Extracticonex (string lpszfile, int niconindex, int[] phiconlarge, int[] Phicons    Mall, uint nicons); }

"Go" C # ListView instance: File icon display