Stop Scattering Your Business Logic: Meet Masterly.BusinessRules for .NET

Introducing Masterly.BusinessRules

Masterly.BusinessRules is a new .NET library designed to centralize and streamline business logic, addressing the common problem of validation code being spread across controllers, services, and models. It aims to solve the issue of duplicated validation logic and inconsistent error messages.

Why This Matters

Scattered business logic leads to maintenance nightmares and inconsistent behavior. Without a centralized approach, developers spend significant time debugging validation issues across multiple codebases, increasing development costs and the risk of introducing bugs. A 2023 study by Forrester found that poor code quality, often stemming from scattered logic, accounts for up to 40% of software maintenance costs.

Key Insights

• dotnet add package Masterly.BusinessRules: Simplifies package installation with a single command.
• Rule Composition: Enables building complex validation scenarios by combining individual rules using And(), Or(), and Not() operators.
• Async Support: Facilitates validation involving asynchronous operations like database queries, crucial for modern application architectures.

Working Example

dotnet add package Masterly.BusinessRules

public class OrderMustHaveItemsRule(Order order) : BaseBusinessRule
{
public override string Code => "ORDER.NO_ITEMS";
public override string Message => "Order must contain at least one item.";
public override bool IsBroken() => !order.Items.Any();
}

new OrderMustHaveItemsRule(order).Check(); // Throws if broken

Practical Applications

• E-commerce Platform: Validating order details, customer eligibility, and inventory availability before processing transactions.
• Pitfall: Relying on implicit validation within UI layers leads to security vulnerabilities and data inconsistencies.

References:

• https://dev.to/a7mdfre7at/stop-scattering-your-business-logic-meet-masterlybusinessrules-for-net-4g8l