Question

Question represents a single DNS query, comprising a domain name (QNAME), a query type (QTYPE), and a query class (QCLASS). It performs extensive argument validation in its public constructor since instances of this type may be created by callers outside the assembly.

Purpose

• Encapsulate the domain/type/class triple that defines a single DNS query.
• Validate caller-supplied query parameters before they are used to build a Request.
• Support internal construction from a Pointer when decoding an embedded question in a Response.

Context

• Namespace: SAIF.Framework.DNS
• Assembly/package: SAIF.BOF.Framework.DNS

Public members

Member	Signature	Purpose
Domain	public string Domain { get; }	The domain name being queried.
Type	public DnsType Type { get; }	The query type (QTYPE), e.g. DnsType.MX.
Class	public DnsClass Class { get; }	The query class (QCLASS), typically DnsClass.IN.
Question(string, DnsType, DnsClass)	public Question(string domain, DnsType dnsType, DnsClass dnsClass)	Constructs and validates a question from caller-supplied domain/type/class values.

Behavioral notes

• The class is marked [Serializable].
• The public constructor enforces BR-002, BR-003, and BR-004.
• An internal constructor, Question(Pointer pointer), exists for building a Question while decoding an embedded question from a raw Response byte array; it is not part of the public surface.
• The per-label 63-character domain validation implied by RFC1035 exists only as a commented-out regular expression in the constructor and is not currently enforced.**

Note: Statements marked with ** could not be confirmed; treat as unknown until verified.

Sources

• SAIF.Framework.DNS\Question.cs