c#中的[Required]和[Required()]有什么区别

Question

I read some documents from github and found there was a difference while creating the object

public class Item
{
    public int Id { get; set; }

    [Required]
    public string Description { get; set; }
}

and

public class Item
{
    public int Id { get; set; }

    [Required()]
    public string Description { get; set; }
}

What is the difference between them? Thanks for help

Answer 1

What is different between [Required] and [Required()] in c#

Nothing.

Attributes are classes which can be configured by a constructor . If there is a default constructor , you can either use the attribute with parenthesis or not, it's up to you.

[Required]
[Required()]

If it has a constructor you could use:

[SomeOtherAttribute("bob")]

Answer 2

There are no functional differences in your examples. The parentheses are optional for attributes where you are not passing any constructor arguments.