Use Instance of a Class as parameter

Finance and Operations/AX Developer Forum
1

Hello dear Community,

I’m a liiiittle bit new to AX and have a (probably) simple question for you.

I’m working with AX 2012.

Let’s assume I’ve got three classes.

“MyClass”, “MyFirstClass” and “MySecondClass”.

MyFirstClass has just one method:

public void howOldAmI(int _age)

{

info(strFmt(“You are %1 years old!”, _age));

}

MySecondClass has also just one method:

public void sayMyName(str _myName)

{

info("My Name is " + _myName);

}

The crucial class is “MyClass”.

It has two methods:

public void AgeOrName(str _ageOrName)

{

switch (_ageOrName)

{

case ‘age’ :

mfc = new MyFirstClass();

this.doSomething(/instance of the class/);

break;

case ‘name’ :

msc = new MySecondClass();

this.doSomething(/instance of the class/);

break;

}

}

public void doSomething(str _ageOrName)

{

_ageOrName.method()

}

I know str is the wrong type of parameter in this case. And this is my question.

How can I use an instance of a class as parameter?

Thanks in advance!

2

Just use the parameter as Class

public void doSomething(MySecondClass _secondClass)

{

_ageOrName.method()

}

look at \Classes\InventUpdate\movement

3

Good Morning Karanthi,

thanks for your reply.

But it’s not always the “MySecondClass”.

If the User says “age”, it has to be the “MyFirstClass”. So in this case, I could never use methods of “MyFirstClass”, it would be always “MySecondClass”.

I hope you understand what I mean.

Kind regards

4

There are many ways and the choice depend on your particular requirements, which we obviously don’t know.

For instance, you can let your classes to implement an interface with a single method (doSomething()) and declare the parameter with the type of the interface. The compiler will ensure that the method must be called with a class implementing the interface and the polymorphic call will run doSomething() method of the concrete class.

This is nothing specific to Dynamics AX - these are basics of object-oriented programming.

5

Hello Martin, thanks for your reply!

Gread idea to use an interface, and of course it works fine.

Kind regards