X++ Interview Questions Answers

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Professional X++ FAQ Questions and Answers

Welcome to our comprehensive Trivia Quiz and interview preparation guide. Below you will find a curated list of popular Trivia Questions and Answers specifically for X++. Whether you are preparing for a technical interview or just testing your knowledge, these FAQ Questions will help you succeed.

What is X++?

X++ is an object-oriented, proprietary programming language used for Microsoft Dynamics 365 Finance and Operations (formerly AX).

What is the primary use of X++?

It is mainly used for business logic customization in Microsoft ERP systems.

What type of language is X++?

X++ is an imperative, object-oriented, and event-driven language.

What platforms support X++?

X++ runs on Microsoft Dynamics 365 Finance and Operations and earlier versions like AX 2012.

How do you declare a variable in X++?

int num = 10; declares an integer variable num with value 10.

What is a table buffer in X++?

A table buffer is an instance of a table, used to query and manipulate data.

How do you retrieve records from a table in X++?

select * from CustTable; fetches all records from CustTable.

What is the difference between select and while select in X++?

select retrieves one record, whereas while select iterates over multiple records.

How do you insert a record in X++?

CustTable cust; cust.AccountNum = "123"; cust.insert(); inserts a new customer.

What is an EDT in X++?

Extended Data Type (EDT) is a reusable data type that enhances consistency.

What is a Base Enum in X++?

A Base Enum is a fixed set of named values used for categorization.

What is a macro in X++?

A macro is a reusable code snippet, defined using #define in X++.

What is an AX class in X++?

A class is a blueprint for objects that encapsulates business logic.

How do you create a class in X++?

class MyClass {} defines a new class named MyClass.

What are methods in X++?

Methods are functions defined within a class to perform operations.

What is void in X++?

void represents a method that does not return a value.

How do you create an object in X++?

MyClass obj = new MyClass(); creates an instance of MyClass.

What are table methods in X++?

Table methods contain business logic related to a specific table.

How do you update records in X++?

t.update(); updates an existing record in a table buffer t.

What is ttsBegin and ttsCommit in X++?

They define a transaction block, ensuring atomic database operations.

What is delete_from in X++?

delete_from is used to delete multiple records from a table.

How do you call a static method in X++?

MyClass::methodName(); calls a static method.

What are RunBase classes in X++?

RunBase is a base class used for batch processing and dialog boxes.

What is an Args object in X++?

The Args class is used to pass parameters between forms and reports.

What are Query objects in X++?

Query objects allow dynamic data retrieval without writing SQL.

What is SysOperation Framework in X++?

A framework for batch processing and asynchronous execution.

How do you handle exceptions in X++?

Using try...catch blocks for error handling.

What is the strFmt function in X++?

It formats strings, similar to printf in C.

What does element.args().caller() do?

It retrieves the calling object in a form.

What is next keyword in X++?

It calls the base class implementation of an overridden method.

What is a Data Dictionary in X++?

The Data Dictionary defines tables, fields, relationships, and indexes.

What is display method in X++?

A display method is used in forms and reports to show calculated fields.

How do you call a form in X++?

new MenuFunction("FormName", MenuItemType::Display).run();

What is an event handler in X++?

A function that listens to and responds to system events.

What is setTmp in X++?

It sets a temporary table as the data source for a form.

What is a temporary table in X++?

A table that stores data only for the duration of the session.

What is eventDriven in X++?

It refers to trigger-based programming, where actions occur on events.

What is find method in X++?

It is a custom method in tables to retrieve records based on criteria.

What is an init method in X++?

It initializes form fields or report values.

What is a pack and unpack method in X++?

They serialize and deserialize object states for batch processing.

What is Map in X++?

A Map is a key-value data structure used for storing data dynamically.

What is Set in X++?

A Set is a collection of unique values.

How do you sort records in X++?

Using order by in a select statement.

How do you create an array in X++?

int myArray[3] = [1,2,3];

What is an index in X++?

An index improves table search performance.

What is recId in X++?

recId is a system-generated unique identifier for each record.

What is a menu item in X++?

A user interface component that launches forms, reports, or classes.

What is a workflow in X++?

It automates approval processes in Dynamics 365.

What is extend in X++?

It is used to create new objects from existing ones.

How do you check if a record exists in X++?

Using if (CustTable::find("123")) { } to check for a customer.