GetAllCommandsHandlers.cs

[HttpGet("GetAllCommandHandlers")]
public async Task<IEnumerable<string>> GetAllCommandHandlers()
{
    var genericType = typeof(ICommandHandler<>);
    var types =  AppDomain.CurrentDomain.GetAssemblies().SelectMany(x => x.GetTypes())
        .Where(t => t.GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition().Equals(genericType)))
        .Select(x => $"{x.FullName}.{x.Name}").ToList();
    
    var genericTypeWithResult = typeof(ICommandHandler<,>);
    var typesWithresult =  AppDomain.CurrentDomain.GetAssemblies().SelectMany(x => x.GetTypes())
        .Where(t => t.GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition().Equals(genericTypeWithResult)))
        .Select(x => $"{x.Module}.{x.Name}").ToList();

    types.Add("With result: ");
    types.AddRange(typesWithresult);
    
    return await Task.FromResult(types);
}