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Fluent Validation extension method

/ Published in: C#
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  1. public class GreaterThanNullableDate<T> : PropertyValidator
  2.     {
  3.         private Expression<Func<T, DateTime?>> mTarget;
  4.         public GreaterThanNullableDate(Expression<Func<T, DateTime?>> expression)
  5.             : base("Property {PropertyName} greater than another date!")
  6.         {
  7.  
  8.             mTarget = expression;
  9.         }
  10.  
  11.         protected override bool IsValid(PropertyValidatorContext context)
  12.         {
  13.             Func<T, DateTime?> oFunc = mTarget.Compile();
  14.             //Type oType = mTarget.Parameters[0].Type;
  15.             DateTime? oTargetDateTime = oFunc.Invoke((T)context.Instance);
  16.  
  17.             DateTime? oSource = context.PropertyValue as DateTime?;
  18.  
  19.             if (oSource != null && oTargetDateTime != null)
  20.             {
  21.                 if (oSource < oTargetDateTime)
  22.                     return false;
  23.             }
  24.  
  25.             return true;
  26.         }
  27.     }
  28.     public static class DefaultValidatorExtensions
  29.     {
  30.         public static IRuleBuilderOptions<T, DateTime?> GreaterThanNullableDate<T>(this IRuleBuilder<T, DateTime?> ruleBuilder, Expression<Func<T, DateTime?>> expression) //Expression<PropertySelector<T, DateTime?>> expression)//Expression<Func<T, DateTime?>> expression) 
  31.         {
  32.  
  33.             return ruleBuilder.SetValidator(new GreaterThanNullableDate<T>(expression));
  34.         }
  35.     }
  36.  
  37.         public partial class NIBRSMasterValidator : AbstractValidator<NIBRSMaster>
  38.     {//only good for NIBRSoffense which means only basic data, nothing about selected code objects. 
  39.         public NIBRSMasterValidator()
  40.         {
  41.             RuleFor(p => p.IncidentDateTime).Must(NotBeFutureDate).WithMessage("NIBRS incident date time: No future date allowed.");
  42.             RuleFor(p => p.IncidentDateTime).GreaterThanNullableDate(p => p.ExceptionalClearanceDateTime).WithMessage("NIBRS incident date cannot be earlier than exceptional clearance date.");
  43.  
  44.         }
  45.         private bool NotBeFutureDate(DateTime? pValue)
  46.         {//where can i move this to? to share. AbstractValidator?
  47.  
  48.             if (pValue > DateTime.Now)
  49.                 return false;
  50.  
  51.             return true;
  52.         }
  53.  
  54.     }

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