AL Development: A Guide to Microsoft’s Modern Business Central Language
AL development is at the root of customizing and extending Microsoft Dynamics 365 Business Central, a powerful ERP solution for businesses. This post explores the AL language, its history, key features, and how it compares to other programming languages like C/AL, C#, and JavaScript. Whether you’re a developer or a business owner, understanding AL development can unlock tailored solutions for your organization.
What Is AL Development?
AL is the programming language used to develop extensions and customizations for Microsoft Dynamics 365 Business Central, a cloud-based ERP platform. Introduced as part of Microsoft’s shift to a modern, cloud-first architecture, AL development enables developers to create apps, modify business logic, and integrate with external systems. Unlike its predecessor, C/AL, AL is designed for extensibility, scalability, and seamless integration with Visual Studio Code.
A Brief History of AL
AL was introduced in 2016 with the release of Dynamics 365 Business Central. Microsoft phased out C/AL, the language used in the older Dynamics NAV, to align with modern development practices. AL development was born to support cloud and on-premises deployments, leveraging Visual Studio Code and the AL Extension for a streamlined developer experience. By 2018, AL became the standard for Business Central customizations, proving that Microsoft is focusing on modular, app-based extensions over monolithic codebases.
Key Features of AL Development
AL is built for ERP customization, offering features that make it developer-friendly and efficient. Here are its main components:
Event-Based Architecture: AL uses events (e.g., OnBefore or OnAfter) to modify behavior without altering core code, ensuring not only clean upgrades but integration of custom business logic with base business logic.
Extension Model: AL development focuses on extensions, self-contained apps that extend Business Central without modifying base objects.
Integration with Visual Studio Code: AL leverages IntelliSense, debugging, and Git integration in VS Code, enhancing productivity.
Table and Page Objects: AL simplifies data modeling with tables (for data storage) and pages (for user interfaces).
AL Language Extension: The AL Language extension in VS Code provides syntax checking, code snippets, and deployment tools.
Cloud and On-Premises Support: AL apps work across deployment models, offering flexibility for businesses.
These features make AL development intuitive for building robust, maintainable ERP solutions.
AL vs. Other Programming Languages.
To understand AL’s strengths, let’s compare it to C/AL, C#, and JavaScript, highlighting similarities and differences.
AL vs. C/AL
Similarity: Both are used for Dynamics NAV/Business Central and share similar syntax for business logic (e.g., triggers).
Difference: C/AL relies on proprietary NAV development environments and modifies core objects, risking upgrade conflicts. AL development uses extensions, ensuring clean upgrades and cloud compatibility.
Example: Modifying a sales order requires editing the core Sales Order (Sales Header).
C/AL
AL
[EventSubscriber(ObjectType::Table, Database::"Sales Header", 'OnAfterInsertEvent', '', true, true)]
procedure AddCustomField(var Rec: Record "Sales Header")
begin
Rec."Custom Field" := 'New Value';
Rec.Modify();
end;
AL vs. C#
Similarity: Both use structured programming and support object-oriented concepts like objects, classes, encapsulation, inheritance, polymorphism, abstraction.
Difference: C# is a general-purpose language for .NET applications, while AL is domain-specific for Business Central. AL development is simpler for ERP tasks but less versatile for non-ERP projects.
Example: Creating a class for a custom API.
C#:
public class Customer
{
public string Name { get; set; }
public void Save() { /* API logic */ }
}AL:
tableextension 50100 CustomerExt extends Customer
{
fields
{
field(50100; "Loyalty Points"; Integer)
{
Caption = 'Loyalty Points';
}
}
}AL vs. JavaScript
Similarity: Both support modern development environments (VS Code) and can integrate with web services.
Difference: JavaScript is ideal for web development, while AL focuses on ERP logic. AL’s event-driven model is tailored for business processes, unlike JavaScript’s client-side focus.
Example: Fetching data from an API.
Javascript:
fetch('api/customers')
.then(response => response.json())
.then(data => console.log(data));AL:
procedure GetCustomerData()
var
Customer: Record Customer;
begin
Customer.FindSet();
repeat
Message(Customer.Name);
until Customer.Next() = 0;
end;Why Choose AL Development?
AL development IS the tool to customize your Dynamics 365 Business Central. Its event-driven model, extension-based architecture, and tight integration with VS Code make it ideal for creating scalable, upgrade-safe customizations. Compared to C/AL, AL is future-proof; compared to C# or JavaScript, it’s specialized for ERP tasks, reducing complexity for business logic.
Getting Started with AL Development
Set Up Your Environment: Install Visual Studio Code and the AL Language extension.
Create an Extension: Use the AL: Go! command in VS Code to scaffold a new project.
Learn Syntax: Study Microsoft’s AL documentation or read MVP's blogs (wink:)
Test Locally: Use a sandbox environment in Business Central to test extensions before deployment.
Conclusion
AL development empowers developers to customize Dynamics 365 Business Central efficiently, offering a modern alternative to C/AL and a focused approach compared to general-purpose languages like C# or JavaScript. With its event-driven model, extension framework, and robust tooling, AL is the go-to choice for ERP customization. Start exploring AL development today to unlock tailored solutions for your business!
