The RuleValidation class validates rule expressions against target types and provides type resolution services. It:

• Validates rule conditions and actions at design-time or runtime
• Resolves types, methods, properties, and fields
• Manages type conversions and implicit/explicit operators
• Supports extension methods (C# 3.0+)
• Provides detailed validation errors with line information

Key Capabilities:

• Type Resolution: Resolves types from assemblies including generic types
• Method Resolution: Finds best-match methods considering overloads, optional parameters, and params arrays
• Property/Field Resolution: Validates member access including indexers
• Conversion Validation: Checks implicit and explicit type conversions
• Access Validation: Enforces visibility rules (public, internal, private)

Supported Expression Types

The library supports a rich set of CodeDOM expressions:

• Binary operations: Comparison, arithmetic, logical operators
• Property/field access: Including nested properties
• Method invocation: Instance and static methods
• Array indexers: Multi-dimensional array access
• Object creation: Constructor calls with parameters
• Type casting: Explicit type conversions
• Generic types: Full support for generic type arguments
• Collection initializers: Array and list initialization

Advanced Features

Forward Chaining

Rules can trigger re-evaluation of other rules when they modify object state, enabling complex rule dependencies and cascading logic.

Update Actions

Use RuleUpdateAction to explicitly mark properties as updated, forcing re-evaluation of dependent rules:

rule.ThenActions.Add(new RuleUpdateAction("this/PropertyName"));

Target Frameworks

• .NET Standard 2.0

Use Cases

This library is ideal for:

• Business rule engines requiring dynamic rule modification
• Policy-based systems with versioned rule sets
• Complex validation scenarios with cascading rules
• Decision automation systems
• Workflow rule evaluation
• Configurable business logic without code deployment