LessThanAttribute.cs

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using System;
 
namespace AnalyzeRe.Attributes
{
    [AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)]
    public class LessThanAttribute : NumericValidationAttribute
    {
        public double LessThanValue { get; private set; }
 
        public bool CanEqual { get; private set; }
 
        public LessThanAttribute(double lessThanValue, bool canEqual = false)
        {
            CanEqual = canEqual;
            LessThanValue = lessThanValue;
        }
 
        public override bool IsValid(object value)
        {
            // If this property is nullable and the value is null, we validate true. If user does
            // not want this nullable to accept a null value, they can use the NotNullAttribute.
            if (value == null) return true;
            double dblValue = GetValue(value);
            return CanEqual ? dblValue <= LessThanValue : dblValue < LessThanValue;
        }
    }
}