Use the Treeview control to implement the Resource Manager (display all folders and files on the local hard disk, and view images) (sample code download)

(1). Description

Use the Treeview control to implement the resource manager, display all folders and files on the local hard disk, and view images

(2). Image example

(3). Code

Using system;
Using system. drawing;
Using system. collections;
Using system. componentmodel;
Using system. Windows. forms;
Using system. Data;
Using system. IO;

Convert namespace image format to II
{
/// <Summary>
/// Summary of form1.
/// </Summary>
Public class formmain: system. Windows. Forms. Form
{
Private system. Windows. Forms. Treeview treeviewdir;
Private system. Windows. Forms. splitter splitter1;
Private system. Windows. Forms. Panel Panel1;
Private system. Windows. Forms. picturebox;
/// <Summary>
/// Required designer variables.
/// </Summary>
Private system. componentmodel. Container components = NULL;

Private Bitmap bitmap;
// Public void Bitmap (string filename, bool useicm );//**********
Public formmain ()
{
//
// Required for Windows Form Designer support
//
Initializecomponent ();
//
// Todo: add Any constructor code after initializecomponent calls
//
Picturebox. Top = treeviewdir. Top;
Picturebox. Left = treeviewdir. Left;
Picturebox. width = panel1.width;
Picturebox. Height = panel1.height;
Bitmap = NULL;
Filldirtree ();
}

/// <Summary>
/// Clear all resources in use.
/// </Summary>
Protected override void dispose (bool disposing)
{
If (disposing)
{
If (components! = NULL)
{
Components. Dispose ();
}
}
Base. Dispose (disposing );
}

# Region windows Form Designer generated code
/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void initializecomponent ()
{
This. treeviewdir = new system. Windows. Forms. Treeview ();
This. splitter1 = new system. Windows. Forms. Splitter ();
This. Panel1 = new system. Windows. Forms. Panel ();
This. picturebox = new system. Windows. Forms. picturebox ();
This. panel1.suspendlayout ();
This. suspendlayout ();
//
// Treeviewdir
//
This. treeviewdir. backcolor = system. drawing. color. fromargb (system. byte) (0), (system. byte) (192), (system. byte) (192 )));
This. treeviewdir. Dock = system. Windows. Forms. dockstyle. Left;
This. treeviewdir. imageindex =-1;
This. treeviewdir. Location = new system. Drawing. Point (0, 0 );
This. treeviewdir. Name = "treeviewdir ";
This. treeviewdir. selectedimageindex =-1;
This. treeviewdir. size = new system. Drawing. Size (136,373 );
This. treeviewdir. tabindex = 0;
This. treeviewdir. afterselect + = new system. Windows. Forms. treevieweventhandler (this. treeviewdir_afterselect );
This. treeviewdir. beforeexpand + = new system. Windows. Forms. treeviewcanceleventhandler (this. treeviewdir_beforeexpand );
//
// Splitter1
//
This. splitter1.location = new system. Drawing. Point (136, 0 );
This. splitter1.name = "splitter1 ";
This. splitter1.size = new system. Drawing. Size (8,373 );
This. splitter1.tabindex = 1;
This. splitter1.tabstop = false;
//
// Panel1
//
This. panel1.controls. Add (this. picturebox );
This. panel1.dock = system. Windows. Forms. dockstyle. Fill;
This. panel1.location = new system. Drawing. Point (144, 0 );
This. panel1.name = "Panel1 ";
This. panel1.size = new system. Drawing. Size (360,373 );
This. panel1.tabindex = 2;
This. panel1.resize + = new system. eventhandler (this. paneltailresize );
//
// Picturebox
//
This. picturebox. backcolor = system. drawing. color. fromargb (system. byte) (192), (system. byte) (192), (system. byte) (255 )));
This. picturebox. Dock = system. Windows. Forms. dockstyle. Fill;
This. picturebox. Location = new system. Drawing. Point (0, 0 );
This. picturebox. Name = "picturebox ";
This. picturebox. size = new system. Drawing. Size (360,373 );
This. picturebox. sizemode = system. Windows. Forms. pictureboxsizemode. stretchimage;
This. picturebox. tabindex = 0;
This. picturebox. tabstop = false;
//
// Formmain
//
This. autoscalebasesize = new system. Drawing. Size (6, 14 );
This. clientsize = new system. Drawing. Size (504,373 );
This. Controls. Add (this. Panel1 );
This. Controls. Add (this. splitter1 );
This. Controls. Add (this. treeviewdir );
This. Name = "formmain ";
This. startposition = system. Windows. Forms. formstartposition. centerscreen;
This. Text = "Image Browsing ";
This. panel1.resumelayout (false );
This. resumelayout (false );

}
# Endregion

Private void filldirtree ()
{
String [] drivers = environment. getlogicaldrives ();
For (INT I = 0; I <drivers. length; I ++)
{
Console. writeline ("I = {0}", I );
If (platforminvokekernel32.getdrivetype (drivers [I]) = platforminvokekernel32.drive _ fixed)
{
Dirnode root = new dirnode (drivers [I]);
Treeviewdir. nodes. Add (Root );
Adddirs (Root );
}
}
}
Private void adddirs (treenode node)
{
Try
{
Directoryinfo dir = new directoryinfo (getpathfromnode (node ));
Directoryinfo [] e = dir. getdirectories ();
Fileinfo [] f = dir. getfiles ();
String name;
For (INT I = 0; I <E. length; I ++)
{
Name = E [I]. Name;
If (! Name. Equals (".")&&! Name. Equals (".."))
{
Node. nodes. Add (New dirnode (name ));
}
}
For (INT I = 0; I <F. length; I ++)
{
Name = f [I]. Name;
Node. nodes. Add (New dirnode (name ));
}
}
Catch
{
}
}
Private string getpathfromnode (treenode node)
{
If (node. Parent = NULL)
{
Return node. text;
}
Return Path. Combine (getpathfromnode (node. Parent), node. Text );
}
/// <Summary>
/// Main entry point of the application.
/// </Summary>
[Stathread]
Static void main ()
{
Application. Run (New formmain ());
}

Private void paneltailresize (Object sender, system. eventargs E)
{
Picturebox. Top = treeviewdir. Top;
Picturebox. Left = treeviewdir. Left;
If (Bitmap! = NULL)
{
If (bitmap. width> bitmap. Height)
{
Picturebox. width = panel1.width;
Picturebox. Height =
(INT) (double) bitmap. Height * panel1.width/bitmap. width );
}
Else
{
Picturebox. Height = panel1.height;
Picturebox. width =
(INT) (double) bitmap. Width * panel1.height/bitmap. Height );
}
}
Else
{
Picturebox. width = panel1.width;
Picturebox. Height = panel1.height;
}
Picturebox. Refresh ();
}

Private void treeviewdir_afterselect (Object sender, system. Windows. Forms. treevieweventargs E)
{
If (Bitmap! = NULL)
{
Bitmap. Dispose ();
}
Try
{
String filename = getpathfromnode (E. node );
Bitmap = new Bitmap (filename );
Fileinfo F = new fileinfo (filename );
If (bitmap. width> bitmap. Height)
{
Picturebox. width = panel1.width;
Picturebox. Height =
(INT) (double) bitmap. Height * panel1.width/bitmap. width );
}
Else
{
Picturebox. Height = panel1.height;
Picturebox. width =
(INT) (double) bitmap. Width * panel1.height/bitmap. Height );
}
Picturebox. Image = bitmap;
This. Text = "Image Browsing" + F. Name;
}
Catch
{
Picturebox. width = panel1.width;
Picturebox. Height = panel1.height;
}
}

Private void treeviewdir_beforeexpand (Object sender, system. Windows. Forms. treeviewcanceleventargs E)
{
Dirnode nodeexpanding = (dirnode) E. node;
If (! Nodeexpanding. subdirectoriesadded)
{
Addsubdirs (nodeexpanding );
}
}
Private void addsubdirs (dirnode node)
{
For (INT I = 0; I <node. nodes. Count; I ++)
{
Adddirs (node. nodes [I]);
}
Node. subdirectoriesadded = true;
}
}
}

(4) Download Sample Code

Http://www.cnblogs.com/Files/ChengKing/TreeView_WinForm.rar