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Static Builder

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The Spec static class provides an alternative to the fluent API when you prefer explicit type arguments or are composing specs from two separate variables.

API​

public static class Spec
{
    public static AndSpecification<TLeft, TRight, T> And<TLeft, TRight, T>(TLeft left, TRight right)
        where TLeft : struct, ISpecification<T>
        where TRight : struct, ISpecification<T>;

    public static OrSpecification<TLeft, TRight, T> Or<TLeft, TRight, T>(TLeft left, TRight right)
        where TLeft : struct, ISpecification<T>
        where TRight : struct, ISpecification<T>;

    public static NotSpecification<TInner, T> Not<TInner, T>(TInner inner)
        where TInner : struct, ISpecification<T>;
}

Usage​

var spec = Spec.And<ActiveUserSpec, PremiumUserSpec, User>(new(), new(1000m));
var orSpec = Spec.Or<ActiveUserSpec, PremiumUserSpec, User>(new(), new(500m));
var notSpec = Spec.Not<ActiveUserSpec, User>(new());

Fluent vs Static Builder​

Both APIs produce the same struct types:

// Fluent
var a = new ActiveUserSpec().And(new PremiumUserSpec(1000m));
// type: AndSpecification<ActiveUserSpec, PremiumUserSpec, User>

// Static builder
var b = Spec.And<ActiveUserSpec, PremiumUserSpec, User>(new(), new(1000m));
// type: AndSpecification<ActiveUserSpec, PremiumUserSpec, User>

Use the static builder when:

  • You need explicit type arguments for disambiguation
  • You are composing two existing spec variables
  • You prefer a functional style over method chaining