---
title: CertificateHolderAddressValidator
summary: API reference for CertificateHolderAddressValidator.
status: draft
owner: SAIF Doc Gen
last_reviewed: 2026-09-24
library: SAIF.Services
reference_type: package
---

# CertificateHolderAddressValidator

FluentValidation validator for `Address`, applied as a nested validator by `CertificateHolderValidator` to check the certificate holder's mailing address. It enforces per-line character limits on `Line1`/`Line2`/`Line3` (80 characters) and `City` (30 characters), and requires `ZipCode` and `PlusFourCode` to be either empty or purely numeric with fixed maximum lengths (5 and 4 digits respectively).

## Purpose
- Caps `Line1`, `Line2`, and `Line3` at 80 characters each.
- Caps `City` at 30 characters.
- Requires `ZipCode` to be at most 5 characters and, if present, to contain only digits.
- Requires `PlusFourCode` to be at most 4 characters and, if present, to contain only digits.

## Context
- Namespace: `SAIF.Services.Policies.Certificates.Validators`
- Assembly/package: `SAIF.Services` (packaged inside the `SAIF.SAIFCode.Core` NuGet package).

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| CertificateHolderAddressValidator (constructor) | `public CertificateHolderAddressValidator()` | Registers all validation rules for `Address`: address line length caps, city length cap, and numeric-format/length checks for zip code and plus-four code. |

## Behavioral notes
- The zip code and plus-four rules use the regex `^$|^\d+$`, so an empty string is treated as valid (these fields are effectively optional) but any non-empty value must be all digits.
- Length rules use `Length(0, n)`, which allows an empty string but rejects any value longer than `n` characters, regardless of the regex outcome.
- All rules are unconditional — this validator does not vary its checks based on whether the enclosing certificate holder's address is foreign; the caller (`CertificateHolderValidator`) is responsible for deciding when to apply address validation.*

## Constraints and usage notes
- Because zip/zip-plus-four rules accept empty strings as valid, this validator alone does not guarantee a zip code is present; callers needing a mandatory zip code must enforce that separately.*

> **Note:** Statements marked with * were inferred from code structure, naming conventions, or
> contextual evidence where direct confirmation was not available in source artifacts. Statements
> marked with ** could not be confirmed; treat as unknown until verified.

## Sources
- `Services/SAIF.Services/Policies/Certificates/Validators/CertificateHolderAddressValidator.cs`