ExpressiveAnnotations - annotation-based conditional validation

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Usage sample for model validation in ASP.NET MVC
change language to test localized information: polski [english]
disable or enable client-side validation: [client] server
annotate required fields using: [asterisks] asterisks-with-hiding no-annotating 
  2. [Required]

    [show attribute]
  3. [RequiredIf("GoAbroad == true")]

    [show attribute]
  4. [RequiredIf("Identification == Document.ID"]
[RequiredIf("Identification == Document.Passport"]
[AssertThat("Identification == Document.ID ? IsRegexMatch(IdentificationValue, '^[a-zA-Z]{3}[0-9]{6}$') : true"]
[AssertThat("Identification == Document.Passport ? IsRegexMatch(IdentificationValue, '^[a-zA-Z]{2}[0-9]{7}$') : true"]

    [show attribute]
  7. [Required]
[AssertThat("Country != NextCountry ? StringArrayLength(KnownLanguages) > 1 : true")]
[ValueParser("ArrayParser")]

    [show attribute]
  8. [RequiredIf(@"GoAbroad == true
              && (
                     (NextCountry != 'Other' && NextCountry == Country)
                     || (Age > 24 && 55 ≥ Age)
                 )")]
[RequiredIf("IntArrayContains(Age, [15, 16, 17])")] 
[AssertThat(@"ReasonForTravel != 'John\'s cat named ""\\\'""\n (Backslash Quote)' && ReasonForTravel != SIMONS_CAT")]

    [show attribute]
  9. [RequiredIf("GoAbroad == true")]
[AssertThat("ReturnDate >= Today()", Priority = 1)]
[AssertThat("ReturnDate >= Today() + WeekPeriod", Priority = 2)]
[AssertThat("ReturnDate < AddYears(Today(), 1)")]
[ValueParser("NonStandardDateParser")]

    [show attribute]
    Latest suggested return: 06/25/2018 
  10. [RequiredIf("GoAbroad == true && ReturnDate > LatestSuggestedReturnDate", AllowEmptyStrings = true)]

    [show attribute]
  11. [RequiredIf("GoAbroad == true")]

    [show attribute]
  12. [AssertThat("(PoliticalStability == Stability.Low || PoliticalStability == Stability.Uncertain) ? AwareOfTheRisks == true : true")]

    [show attribute]
  14. [RequiredIf("SportType == 'Extreme' || (SportType != 'None' && GoAbroad == true)")]
[AssertThat("IsBloodType(Trim(BloodType))"]

    [show attribute]
    1. [RequiredIf("Parent.GoAbroad && Phone == null")]
[AssertThat("IsEmail(Email)")]

      [show attribute]
    2. [RequiredIf("Parent.GoAbroad && Email == null")]
[AssertThat(@"IsRegexMatch(Phone, '^\\d+$'), Priority = 1")]
[AssertThat("Length(Phone) > 8 && Length(Phone) < 16", Priority = 2)]

      [show attribute]
    3. [AssertThat("StartsWith(Details, StreetPrefix)")]
[AssertThat("Length(Trim(Details)) > Length(StreetPrefix) + 1")]

      [show attribute]
    4. [AssertThat("StartsWith(Details, StreetPrefix)")]
[AssertThat("Length(Trim(Details)) > Length(StreetPrefix) + 1")]

      [show attribute]
  16. [AssertThat("AgreeForContact == true")]

    [show attribute]
  17. [RequiredIf(@"AgreeForContact == true
              && (ContactDetails.Email != null || ContactDetails.Phone != null)
              && (ContactDetails.Addresses[0].Details != null || ContactDetails.Addresses[1].Details != null))]

    [show attribute]
  18. [AssertThat("FlightId != Guid('00000000-0000-0000-0000-000000000000') || !GoAbroad")]

    [show attribute]
  19. [RequiredIf("GoAbroad == true")]
[AssertThat("GoAbroad
                 ? IntArrayLength(SelectedDonations) > 2
                 : IntArrayLength(SelectedDonations) > 1", Priority = 1)]
[AssertThat("SelectedDonations != null && IntArrayLength(SelectedDonations) > 0 
                 ? SelectedCurrencies[0] || SelectedCurrencies[1]
                 : true", Priority = 2")]
[ValueParser("ArrayParser")]

    [show attribute]
                    Bitcoin Ethereum 
  20. [CustomRequiredIf("GoAbroad == true")]
[CustomAssertThat("Length(コメント) > 1e1 - 1", Priority = 2)]
[CustomAssertThat("Length(コメント) > 1e1 - 6", Priority = 1)]

    [show attribute]