Question

I’ve the following Attributes defined on my Name field:

[Required(ErrorMessageResourceName = "ValidationErrorRequiredField", ErrorMessageResourceType = typeof(MyResources))]
[Display(Order = 0, Name = ResXStrings.UserName, ResourceType = typeof(MyResources))]
public string Name { get; set; }

I want to create a custom Attribute which looks like this:

[MyAttribute(DisplayName = "Username", ErrorMessage = "ValidationErrorRequiredField", ResourceType = typeof(MyResources))]
public string Name { get; set; }

which defines in code the other two (Required and Display) attributes.

How to implement this ?

UPDATE
It’s not possible.
Thanks to all people who helped answering my question.

Answer 1

I don’t think you can. Since consumers of the attributes often find them by type your new attribute would have to be both a RequiredAttribute and a DisplayAttribute. C# doesn’t support multiple inheritance so there is no way to make such a class.