Required attribute for an integer value

Question

I have a viewmodel with an Id property

[Required]
public int Id { get; set; }

But I think this attribute is working only for string propert

Answer 1

This is similar to the answer from @Lee Smith, but enables 0 to be valid input, which might be useful in some scenarios.

What you can do is to init the int value to another value then 0, like this:

[Range(0, int.MaxValue)]
public int value{ get; set; } = -1;

It would even be possible to support all values except int.MinValue by doing it like this:

[Range(int.MinValue + 1, int.MaxValue)]
public int value{ get; set; } = int.MinValue;