X++

X++, short for X++ Programming Language, is an object-oriented, event-driven language used primarily for business application development within Microsoft Dynamics 365 Finance and Operations (formerly Dynamics AX). It is designed to integrate tightly with the Dynamics platform, allowing developers to customize, extend, and automate enterprise workflows, data models, and forms. Developers can access X++ through the Microsoft Visual Studio-based development environment included with Dynamics 365 and compile code directly into the application server.

X++ exists to provide a consistent and extensible programming model for Dynamics applications. Its design philosophy emphasizes strong integration with the underlying database, type safety, and maintainability, enabling developers to manipulate tables, business logic, and UI elements in a unified syntax. By combining procedural, object-oriented, and query-driven constructs, X++ allows efficient development of complex business processes while maintaining a high level of consistency with the Dynamics ecosystem.

X++: Variables and Basic Syntax

The core of X++ includes strongly typed variables, explicit declarations, and simple expressions, forming the foundation for business logic.

str customerName;
customerName = "Contoso Ltd.";
info("Customer: " + customerName);

This snippet declares a string variable and outputs its value using info, the standard Dynamics system method for messages. X++ syntax prioritizes clarity and explicit typing, similar in structure to C# and Visual Basic in enterprise contexts.

X++: Classes and Methods

X++ is fully object-oriented, supporting classes, methods, and encapsulation for reusable business logic.

class CustomerHelper
{
    public str GetCustomerInfo(str accountNum)
    {
        return "Info for account " + accountNum;
    }
}

CustomerHelper helper = new CustomerHelper();
info(helper.GetCustomerInfo("1101"));

This example defines a class with a method and calls it from a procedural context. Object-oriented constructs in X++ enable modular, maintainable business logic, analogous to class usage in C# or Java systems.

X++: Table Access and Queries

X++ tightly integrates with Dynamics tables, providing both static and dynamic query mechanisms to retrieve and manipulate data.

select firstName, lastName from CustTable
    where AccountNum == "1101";

CustTable cust;
while select cust where cust.AccountNum == "1101"
{
    info(cust.Name);
}

This snippet demonstrates selecting records from CustTable using both static queries and while select loops. X++ abstracts SQL-like operations while maintaining type safety, similar to ORM usage in C# or SQL queries.

X++: Event Handling and Form Integration

X++ supports event-driven programming, allowing code to respond to user actions in forms, reports, or business events within Dynamics.

void clicked()
{
    info("Button pressed in form");
}

Event handlers such as clicked integrate business logic with user interface elements, enabling responsive, interactive applications. This model is conceptually similar to event handling in WinUI or UI-driven programming in Xojo.

X++: Batch Jobs and Server Processing

X++ enables writing batch jobs, scheduled tasks, and server-side processing logic that operate across the Dynamics environment.

class BatchJob extends RunBaseBatch
{
    public void run()
    {
        info("Processing batch job...");
    }
}

This example defines a batch job class extending RunBaseBatch. X++ server-side constructs allow scalable, automated processing similar to background tasks or scheduled jobs in C# or database-driven workflows.

Overall, X++ provides a tightly integrated, object-oriented language for developing and extending Microsoft Dynamics 365 applications. When combined with C#, Visual Basic, SQL, and UI frameworks like WinUI, it enables developers to implement complex business logic, automate processes, and maintain consistent enterprise applications efficiently. Its combination of database integration, event-driven programming, and class-based design makes X++ a reliable foundation for long-lived enterprise software development.