BangumiTurret/BanTur/Utility/PathHelper.cs

using System;
using System.IO;

namespace BanTur.Utility
{
    public static class PathHelper
    {
        public static string DbFilePath
        {
            get
            {
                var env = Environment.GetEnvironmentVariable(BanTurRuntime.EnvVarDbPath);
                if (!string.IsNullOrWhiteSpace(env))
                {
                    if (Directory.Exists(Path.GetDirectoryName(env))) return env;
                }

                var exePath = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;

                var exeDir = Path.GetDirectoryName(exePath);
                var fileName = Path.ChangeExtension(Path.GetFileName(exePath), "db3");

                return Path.Combine(exeDir, fileName);
            }
        }
    }
}