X++ Functions

Applies To: Microsoft Dynamics AX 2012 R3, Microsoft Dynamics AX 2012 R2, Microsoft Dynamics AX 2012 Feature Pack, Microsoft Dynamics AX 2012

In Microsoft Dynamics AX, the X++ language provides more than 100 system functions that are not part of any class. The two types of functions are as follows:

  • Run time – functions that are executed during run time.

  • Compile time – functions that are executed during compile time.

Run Time Functions

Run time functions used for data type conversions, mathematical operations, and so on. Some common run time functions are as follows:

  • str2Int – creates an int value from a str value.

  • abs – creates a positive real value from a real value that is either positive or negative.

  • conFind – retrieves the location of an element in a container.

For more information, see the reference topics that are listed under Functions.

Aa595142.collapse_all(en-us,AX.60).gifCall Run Time Functions from .NET

The logic of the X++ run time functions is also implemented in the following .NET assembly:


Inside the previous assembly, the X++ run time functions are implemented as static methods of the following class:


Compile Time Functions

Compile time functions are executed early in the compile of X++ code. Most of these functions retrieve metadata about items that are in the Application Object Tree (AOT). Some common compile time functions are as follows:

  • classNum – retrieves the ID of a class.

  • classStr – verifies during compile time that a class by that name exists. This is better than discovering the error later during run time.

  • evalBuf – evaluates the input string of X++ code, and then returns the results as a string.

  • literalStr – retrieves a label ID when given the string representation of a label, such as the string "@SYS12345". For example, myLabel.exists(literalStr("@SYS12345"));.



Compile time functions are sometimes called intrinsic functions.


X++ compile time functions cannot be called from a .NET program.

For more information, see Intrinsic Functions.

See also

X++ Function Categories and their Functions


Intrinsic Functions

Functions and Macros

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