X++ Functions [AX 2012]

Updated: September 21, 2011

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 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 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.

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