C# How to set folder icon?

I use FilePathDialog.SelectedPath get folder's path I also know icon's path but i d开发者_运维百科on't know how to set that folder's icon

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It seems important to set some file attributes.

Based on https://github.com/dimuththarindu/FIC-Folder-Icon-Changer here is the slimmed down version.

Within the folder, whose attribute you want to set, create three files:

• MyIcon.ico

• The icon you want to display. You may use a different file name.

• desktop.ini - Containing the below text

  [.ShellClassInfo]

  IconResource=MyIcon.ico,0

  [ViewState]

  Mode=

  Vid=

  FolderType=Generic

• .hidden- Containing the below text

  desktop.ini

  MyIcon.ico

File types in my case were UTF-8 with BOM.

Then you need to set attributes for all three files to

• hidden

• readonly

Finally, you need to notify the system that a change occurred

SHChangeNotify(0x08000000, 0x0000, (IntPtr)null, (IntPtr)null);

Assuming you created a Visual Studio solution with a folder named Resources holding your three files, here's the code to set the icon:

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace SetFolderIcon
{
    class Program
    {
        [DllImport("shell32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern void SHChangeNotify(
            int wEventId, int uFlags, IntPtr dwItem1, IntPtr dwItem2);

        static void Main(string[] args)
        {
            string location = $"C:\\Users\\Balint\\Desktop";
            string folderPath = Path.Combine(location, "My Folder");

            string desktopIniPath = Path.Combine(folderPath, "desktop.ini");
            string iconPath = Path.Combine(folderPath, "MyIcon.ico");
            string hiddenPath = Path.Combine(folderPath, ".hidden");

            Directory.CreateDirectory(folderPath);

            File.Copy($"Resources\\desktop.ini", desktopIniPath);
            File.Copy($"Resources\\Klinng.ico", iconPath);
            File.Copy($"Resources\\.hidden", hiddenPath);

            File.SetAttributes(desktopIniPath,
                File.GetAttributes(desktopIniPath)
                | FileAttributes.Hidden
                | FileAttributes.ReadOnly);
            File.SetAttributes(iconPath,
                File.GetAttributes(iconPath)
                | FileAttributes.Hidden
                | FileAttributes.ReadOnly);
            File.SetAttributes(hiddenPath,
                File.GetAttributes(hiddenPath)
                | FileAttributes.Hidden
                | FileAttributes.ReadOnly);
            File.SetAttributes(folderPath,
                File.GetAttributes(folderPath)
                | FileAttributes.ReadOnly);

            SHChangeNotify(0x08000000, 0x0000, (IntPtr)null, (IntPtr)null);
        }
    }
}

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You have to write the desktop.ini file.

[.ShellClassInfo]
IconResource=Icon.ico,0
IconFile=Icon.ico
IconIndex=0
[ViewState]
Mode=
Vid=
FolderType=Pictures

C# code

string dir = "Folder Path";   
string[] lines = { "[.ShellClassInfo]", "IconResource=Icon.ico,0", "[ViewState]", "Mode=", "Vid=", "FolderType=Pictures" };
File.WriteAllLines(dir + @"\desktop.ini", lines);

IconResource: {Icon Path},0
FolderTypes: Generic, Documents, Pictures, Music, Videos

If you need more information, check this GitHub project: https://github.com/FIC-Folder-Icon-Changer

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There are basically two steps involved in assigning an icon to a folder (or possibly three steps, if you count creating the folder):

Create a desktop.ini file inside the folder for which to create the icon (the "Target Folder"). Set the Target Folder's attribute to "System".

more :

Create Icons for Folders in Windows Explorer, Using C#

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this website has a very similar example