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next() or super () in D365FO

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Posted on by CU05031448-0

1,323

Dear team,

As I have used practically next() with extension class. For example -

Table - CustTable -- Insert()

Used CoC-

next insert ()

Here the next keyword called the base method on insert from the CustTable.

AX2012-

Super ()

Here if I do the same for CustTable -- Insert method.

So, the super() , what it will return?

Kindky advise pls.

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Huggins Mafigu 511 on at

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See below,

public void insert() { //your code here next insert(); }

You don't use super() in CoC.

Your method will look like the snippet above

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André Arnaud de Cal... 303,669 Super User 2026 Season 1 on at

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Hi,

In Dynamics 365 for an extension class, you don't use the super() command. You can write code before or after the next() statement in Dynamics 365 to have code executed before the main coding or after that logic.
public void insert() { //your code here to execute logic before the coding you need to extend next insert(); //your code here to execute logic after the coding you need to extend }

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Layan Jwei 8,165 Super User 2026 Season 1 on at

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Hi,

You can only use super() if the class and method is created by you.

But in extensions (CoC), we always use next, we don't use super.

So if the standard method was like this

Info("hi");

super();

Info("bye");

When using CoC, you need to use next().

If you put ur code before next(), ur code will be executed before the method runs, which means before info("hi")

And if you put it after next(), your code will be executed after the method runs, which is after info("bye")

Thanks,
Layan Jweihan
Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future.

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CU05031448-0 1,323 on at

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Hi Layan, as you said

"We can only use super() if the class and method is created by you."

---- What I understood,

So, for my CUSTOM class, tables or forms methods I can used super as you mentioned in D365FO.

My question is

For example -

1. CustTable - Insert method

It's having super. But we can't used that. We should do for next insert() to call itt.

2. My custom Table - Insert method

I can use super here in D365FO

My custom code

super ();

***My question is when the super is getting called for my custom table for insert method, what it will call internally ?

Kindly elaborate pls.

Thanks in advance.

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Martin Dráb 239,022 Most Valuable Professional on at

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super() is used with table inheritance. For example, ClassA has method1() with some logic and you create ClassB inheriting from ClassA. Then you can override method1(), add some extra logic there and use super() to call the code in the parent class (i.e. method1() in ClassA). Note that the behavior of ClassA didn't change. This applies to both AX 2012 and F&O.

next is used with extensions, e.g. you create ClassA_Extension class and adjust the behavior of ClassA.method1(). This is a new concept in F&O; it doesn't exist in AX 2012.

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CU05031448-0 1,323 on at

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So, Martin what I understood

AX 2012-

Class B extends Class A

{

super(); // is here super is called the Class A ?

Add my custom Logic

}

D365FO -

.

extension of(TableStr(Class A))]

final pubic class ClassA_Extension

{

next method1();

// Add my custom code here

}

Am I correct?

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Martin Dráb 239,022 Most Valuable Professional on at

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No, you aren't. Maybe you should read my reply once more.

Your two examples do very different things and you're wrong in thinking that inheritance was removed in F&O.

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Navneeth Nagrajan 2,533 Super User 2026 Season 1 on at

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Hi CU05031448-0,

To add to the explanation provided by Martin the correct logic for Class level inheritance which is applicable in D365 FO and Ax2012 R3 is mentioned in the example.
Class A

{

protected void method1()

{
//Base logic is here.
}

}

Class B extends Class A

{

//Override method1() here and then this will

protected void method1()

{
super();
//Extra code goes in here

}

}

In D365FO in case of COC the behaviour is the extra logic will run either before or after the standard logic and this is based on the requirement in hand.

.

extension of(TableStr(Class A))]

final pubic class ClassA_Extension

{

next method1();

// Add my custom code here

}

Hope this helps. Happy to answer questions, if any.

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CU05031448-0 1,323 on at

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Thanks Navneeth,

So, in D365FO, we no need Class B? as the code you suggested.

Kindly advise pls

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Martin Dráb 239,022 Most Valuable Professional on at

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Of course you still need inheritance! For example, if you want to create a new SysOperation controller, you'll create your own class (ClassB) extending SysOperationServiceController (ClassA) and you may override base methods. Creating a child class and extending a class are two completely different things and each has its own purpose.

Extensions have been added to F&P not to replace inheritance (which they don't), but as an alternative to modifying code of standard classes (which was possible in older versions but it's not in F&O).

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