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ZeroAlloc.Validation 1.5.3

ZeroAlloc.Validation

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Source-generated, attribute-based validation for .NET that allocates nothing on the valid path. The source generator emits a strongly-typed validator class at build time — no reflection at runtime. When all rules pass, the entire validation cycle produces zero heap allocations.

Install

dotnet add package ZeroAlloc.Validation

30-Second Example

using ZeroAlloc.Validation;

[Validate]
public class CreateOrderRequest
{
 [NotEmpty][MaxLength(50)] public string Reference { get; set; } = "";
 [GreaterThan(0)] public decimal Amount { get; set; }
 [NotEmpty][EmailAddress] public string Email { get; set; } = "";
}

// The source generator emits CreateOrderRequestValidator at build time
var request = new CreateOrderRequest
{
 Reference = "ORD-2026-001",
 Amount = 99.99m,
 Email = "customer@example.com"
};
var validator = new CreateOrderRequestValidator();
var result = validator.Validate(request);

if (!result.IsValid)
 foreach (ref readonly var f in result.Failures)
 Console.WriteLine($"{f.PropertyName}: {f.ErrorMessage}");

Performance

See Performance for full benchmark results.

Packages

Features

• Zero heap allocation on the valid path
• 25+ built-in validation attributes
• Nested object and collection validation
• ASP.NET Core auto-validation (HTTP 422 on failure)
• Zero-friction DI registration (AddZeroAllocValidators())
• Source-generated Microsoft.Extensions.Options integration (ValidateWithZeroAlloc())
• Per-rule severity (Error, Warning, Info)
• Conditional rules (When / Unless / [SkipWhen])
• Short-circuit with [StopOnFirstFailure]
• Custom rules via [Must] predicates or [CustomValidation] methods
• Testing helpers via ZeroAlloc.Validation.Testing

Documentation

• Getting Started
• Attribute Reference
• Nested Validation
• Collection Validation
• Custom Validation
• Error Messages
• ASP.NET Core Integration
• DI Registration (Inject)
• Options Validation
• Testing
• Performance
• Advanced Features