Rule Predicates

Built-in factory methods for common validation patterns. No raw expressions needed.

using RoslynRules.Predicates;

Available Predicates

Predicate	Description
`IsNotNull(path)`	Value is not null
`IsNull(path)`	Value is null
`Equals(path, value)`	Equality comparison
`NotEquals(path, value)`	Inequality comparison
`GreaterThan(path, value)`	`>` comparison
`GreaterThanOrEqual(path, value)`	`>=` comparison
`LessThan(path, value)`	`<` comparison
`LessThanOrEqual(path, value)`	`<=` comparison
`Between(path, min, max)`	Inclusive range check
`MatchesRegex(path, pattern)`	Regex match
`Contains(path, value)`	String/collection contains
`StartsWith(path, value)`	String prefix
`EndsWith(path, value)`	String suffix
`IsEmpty(path)`	String/collection empty
`IsNotEmpty(path)`	String/collection not empty
`HasLength(path, min, max)`	Length in range
`IsIn(path, values)`	Value in set
`IsNotIn(path, values)`	Value not in set
`IsTrue(path)`	Boolean true
`IsFalse(path)`	Boolean false
`IsDateBefore(path, date)`	Date comparison
`IsDateAfter(path, date)`	Date comparison
`IsDateBetween(path, start, end)`	Date range
`IsGuid(path)`	Valid GUID format
`IsEmail(path)`	Valid email format
`IsUrl(path)`	Valid URL format

Usage

var workflow = new Workflow
{
    Rules =
    {
        RulePredicates.IsNotNull("customer"),
        RulePredicates.GreaterThan("customer.Age", 18),
        RulePredicates.MatchesRegex("customer.Email", @"^[^@]+@[^@]+\.[^@]+$"),
        RulePredicates.IsIn("customer.Status", new[] { "Active", "Pending" })
    }
};

Custom Predicates

Create your own by instantiating Rule with the appropriate Expression:

public static Rule HasMinimumOrders(string path, int min)
{
    return new Rule
    {
        Description = $"{path} has at least {min} orders",
        Expression = $"{path}.Orders.Count >= {min}"
    };
}

Rule — Underlying model

Rule Predicates

Available Predicates

Usage

Custom Predicates

Related