Use current year as range validation in DataAnnotations

Question

[Range(1900, DateTime.Now.Year, ErrorMessage = "Please enter a valid year")]

This doesn't work. For "DateTime.Now.Year" it tells me

An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type

Answer 1

You can create your own RangeUntilCurrentYearAttribute that extends the RangeAttribute.

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
public class RangeUntilCurrentYearAttribute : RangeAttribute
{
    public RangeUntilCurrentYearAttribute(int minimum) : base(minimum, DateTime.Now.Year)
    {
    }
}

And use it like this:

public class Foo
{
    [RangeUntilCurrentYear(1900, ErrorMessage = "Please enter a valid year")]
    public int Year { get; set; }
}