public IActionResult Download([FromForm] int id)
{
var entity = _service.GetEntity(id);
string filePath = Path.Combine(_uploadAttachPath, entity.save_name);
var provider = new FileExtensionContentTypeProvider();
var memi = provider.Mappings[entity.ext];
var stream = System.IO.File.OpenRead(filePath);
return(File(stream, memi, entity.name));
}
