You could use the native SHGetFileInfo function. You can import it using the .net InteropServices.
There's a knowledge base article describing how to do it.
http://support.microsoft.com/kb/319350
EDIT:
Also
How do I fetch the folder icon on Windows 7 using Shell32.SHGetFileInfo
Example:
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace IconTest2
{
public partial class MainWindow : Window
{
//Struct used by SHGetFileInfo function
[StructLayout(LayoutKind.Sequential)]
public struct SHFILEINFO
{
public IntPtr hIcon;
public int iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
};
//Constants flags for SHGetFileInfo
public const uint SHGFI_ICON = 0x100;
public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
//Import SHGetFileInfo function
[DllImport("shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
public MainWindow()
{
InitializeComponent();
SHFILEINFO shinfo = new SHFILEINFO();
//Call function with the path to the folder you want the icon for
SHGetFileInfo(
"C:\Users\Public\Music",
0, ref shinfo,(uint)Marshal.SizeOf(shinfo),
SHGFI_ICON | SHGFI_LARGEICON);
using (Icon i = System.Drawing.Icon.FromHandle(shinfo.hIcon))
{
//Convert icon to a Bitmap source
ImageSource img = Imaging.CreateBitmapSourceFromHIcon(
i.Handle,
new Int32Rect(0, 0, i.Width, i.Height),
BitmapSizeOptions.FromEmptyOptions());
//WPF Image control
m_image.Source = img;
}
}
}
}
Reference for SHGetFileInfo - http://msdn.microsoft.com/en-us/library/windows/desktop/bb762179(v=vs.85).aspx
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