NuGet.ManifestMetadata.Validate C# (CSharp) Method

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            if (!String.IsNullOrEmpty(Id))
            {
                if (Id.Length > PackageIdValidator.MaxPackageIdLength)
                {
                    yield return new ValidationResult(String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_IdMaxLengthExceeded));
                }
                else if (!PackageIdValidator.IsValidPackageId(Id))
                {
                    yield return new ValidationResult(String.Format(CultureInfo.CurrentCulture, NuGetResources.InvalidPackageId, Id));
                }
            }

            if (LicenseUrl == String.Empty)
            {
                yield return new ValidationResult(
                    String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_UriCannotBeEmpty, "LicenseUrl"));
            }

            if (IconUrl == String.Empty)
            {
                yield return new ValidationResult(
                    String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_UriCannotBeEmpty, "IconUrl"));
            }

            if (ProjectUrl == String.Empty)
            {
                yield return new ValidationResult(
                    String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_UriCannotBeEmpty, "ProjectUrl"));
            }

            if (RequireLicenseAcceptance && String.IsNullOrWhiteSpace(LicenseUrl))
            {
                yield return new ValidationResult(NuGetResources.Manifest_RequireLicenseAcceptanceRequiresLicenseUrl);
            }
        }