如何在C Sharp中获取当前活动窗口的图标？

using System;
using System.Drawing;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("user32.dll")]
    private static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll")]
    private static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);

    [DllImport("kernel32.dll")]
    private static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);

    [DllImport("psapi.dll")]
    private static extern int GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, out string lpFilename, int nSize);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    private static extern bool DestroyIcon(IntPtr handle);

    [DllImport("shell32.dll", CharSet = CharSet.Auto)]
    private static extern int ExtractIconEx(string lpszFile, int nIconIndex, out IntPtr phiconLarge, out IntPtr phiconSmall, int nIcons);

    static void Main()
    {
        IntPtr hWnd = GetForegroundWindow();
        int processId;
        GetWindowThreadProcessId(hWnd, out processId);

        IntPtr hProcess = OpenProcess(0x0410, false, processId);
        string fileName;
        GetModuleFileNameEx(hProcess, IntPtr.Zero, out fileName, 1024);

        IntPtr hIconLarge, hIconSmall;
        ExtractIconEx(fileName, 0, out hIconLarge, out hIconSmall, 1);

        Icon icon = Icon.FromHandle(hIconSmall);
        // 使用图标进行操作...

        DestroyIcon(hIconLarge);
        DestroyIcon(hIconSmall);
    }
}