проверка загрузки файла ASP.NET CORE MVC
public class UserViewModel
{
[Required(ErrorMessage = "Please select a file.")]
[DataType(DataType.Upload)]
[MaxFileSize(5* 1024 * 1024)]
[AllowedExtensions(new string[] { ".jpg", ".png" })]
public IFormFile Photo { get; set; }
}
Graceful Goldfinch