Class NotDefaultAttribute
- Namespace
- Trellis
- Assembly
- Trellis.Core.dll
Opts a Required*-derived value object into per-type sentinel rejection.
Without this attribute the bare base accepts every concrete value and rejects only
null; with it the generator emits a sentinel-rejection check appropriate to the
underlying primitive.
[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
public sealed class NotDefaultAttribute : Attribute- Inheritance
-
NotDefaultAttribute
- Inherited Members
- Extension Methods
Remarks
The sentinel each base rejects when this attribute is applied:
- RequiredString<TSelf> — rejects Empty; combined with TrimAttribute a whitespace-only input trims to empty and is rejected.
- RequiredGuid<TSelf> — rejects Empty.
- RequiredInt<TSelf> / RequiredLong<TSelf> / RequiredDecimal<TSelf> — rejects
0. - RequiredDateTime<TSelf> / RequiredDateTimeOffset<TSelf> — rejects MinValue / MinValue.
Invalid on RequiredBool<TSelf> and RequiredEnum<TSelf> — those
bases have no meaningful sentinel, so applying it there raises generator error TRLS058.
Properties
Code
Gets or sets an application-defined reason code that replaces the framework default on every failure this attribute produces.
public string? Code { get; set; }Property Value
- string
A non-empty code, or null to keep the framework default. Setting it to an empty or whitespace string is a generator error (
TRLS060).
Remarks
The framework vocabulary is frozen so that one client catalog entry works across every Trellis service. An application that owns both ends of its own contract — it wrote the declaration and it writes the catalog key — may name the failure in its own terms instead, and nothing it does here can invalidate another party's catalog. An override carries no warning and no penalty.