PixiEditor/PixiEditor.UpdateInstaller/Extensions.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;

namespace PixiEditor.UpdateInstaller
{
    public static class Extensions
    {
        private const int MaxPath = 255;

        public static string GetExecutablePath()
        {
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                StringBuilder sb = new StringBuilder(MaxPath);
                GetModuleFileName(IntPtr.Zero, sb, MaxPath);
                return sb.ToString();
            }

            return Process.GetCurrentProcess().MainModule?.FileName;
        }

        [DllImport("kernel32.dll")]
        private static extern uint GetModuleFileName(IntPtr hModule, StringBuilder lpFilename, int nSize);
    }
}