// Read-only managed metadata extraction; does not load or execute product assemblies.
using System.Reflection.Metadata;
using System.Reflection.PortableExecutable;
using System.Text.Json;
var root = Path.GetFullPath(args[0]);
var modules = new List<object>();
foreach (var directory in args.Skip(1))
{
    foreach (var path in Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories).Order())
    {
        try
        {
            using var file = File.OpenRead(path);
            using var pe = new PEReader(file);
            if (!pe.HasMetadata) continue;
            var metadata = pe.GetMetadataReader();
            if (!metadata.IsAssembly) continue;
            var assembly = metadata.GetAssemblyDefinition();
            modules.Add(new { file = Path.GetRelativePath(root, path).Replace(Path.DirectorySeparatorChar, '/'),
                assembly = metadata.GetString(assembly.Name), version = assembly.Version.ToString(),
                mvid = metadata.GetGuid(metadata.GetModuleDefinition().Mvid).ToString("D") });
        }
        catch (BadImageFormatException) { /* Native DLLs have no CLR module identity. */ }
    }
}
Console.WriteLine(JsonSerializer.Serialize(modules));