To add a function to a codeunit, use the following procedure.
To add a function
Select the C/AL Editor, choose View, and then choose C/AL Globals.
Note For more information about how to open the C/AL Editor, see How to: Modify an Existing Codeunit. In the C/AL Globals window, choose the Functions tab.
Enter a name for each function that you want to add.
Choose Locals to define the parameters, return value, local variables, and text constants in the C/AL Locals window.
In the C/AL Locals window, choose the Parameters tab and specify the calling method, name, and data type of each parameter. You can also specify a subtype and a length, but this is optional.
To specify the calling method of a parameter, either select or clear the Var check box. If you select the Var check box, then the parameter is passed by reference rather than by value. The value of a variable can only be changed by a function when it is passed to the function by reference. When the parameter is not specified as Var, only a copy of the variable is passed to the function. If the function changes that value, the change only affects the copy and not the variable itself.
If the type that you select corresponds to an application object, then you must also add a subtype, that is, the name of a specific object in the database. If you select Text or Code data types, then you must define a length. The default length is 10 characters for Code and 30 characters for Text.
In the C/AL Locals window, choose the Return Value tab and specify the return value for your new function. Enter a name for the return value and select a data type from the drop-down list. If the data type is Text or Code, then you can also select a length.
In the C/AL Locals window, choose the Variables tab and define local variables.
For each local variable, you must enter a name and select a data type. If the data type that you select corresponds to an application object, then you must also add a subtype, that is, the name of a specific object in the database. If you select Text or Code data types, then you must define a length for the variable. The default length is 10 characters for Code and 30 characters for Text.
In the C/AL Locals window, choose the Text Constants tab and define text constants for the function.