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Exam MB-500 topic 4 question 9 discussion

Actual exam question from Microsoft's MB-500

Question #: 9
Topic #: 4

HOTSPOT -
You have the following class definition:

You need to create an extension class and create a new static method in it that converts miles to kilometers and then call the method from another class.
How should you complete the code and call the method? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

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Suggested Answer:

by afw at Sept. 5, 2020, 3:19 a.m.

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afw

Highly Voted 4 years, 4 months ago

Naswer should be :final class CustUnitConv_Extension

upvoted 58 times

Ahmed_Hassan

4 years, 2 months ago

I agree with you

upvoted 4 times

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Tomas1

Highly Voted 4 years ago

Correct answer: 1,1

upvoted 20 times

lamawehbe

1 year ago

i agree

upvoted 1 times

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2d4d146

Most Recent 8 months, 2 weeks ago

final class CustUnitConv_Extension

upvoted 1 times

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theCoder1

1 year, 5 months ago

Correct answer: 1,1

upvoted 3 times

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Prollyx

2 years, 9 months ago

1&1 is correct

upvoted 4 times

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niko_

2 years, 11 months ago

Correct is 1 and 1

upvoted 3 times

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Sisb

3 years ago

A - _Extension is mandated, class name does not mater A - static method, so can be called ::

upvoted 1 times

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ET82

3 years, 5 months ago

First option First option

upvoted 3 times

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pinticas

3 years, 7 months ago

Correct answers are C and A. - C: Because naming convention makes a class name end with *_Extension. - A: Look at it, this second part of the question is a hint about the first (which is C). TEST IT in D365 and you will see this is the correct answer.

upvoted 1 times

LaXavee

3 years, 6 months ago

1- You right in that the class name must end with *_Extension but you forget that the 'C' answer is an static class and that it's not correct for a CoC extension class, so the correct answer is 'A'. 2- And as you said, this is 'A' too.

upvoted 5 times

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Anton_Venter

3 years, 9 months ago

First should be "final class CustUnitConv_Extension" because extension classes can only end in _Extension, the first part of the class name doesn't matter.

upvoted 3 times

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BuzzZ

3 years, 10 months ago

both should be the 1st answer

upvoted 4 times

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Pir

4 years ago

2nd choice is both answers. Please read question carefully. In first, the extension class should begin with original class name, i.e., UnitConv_MyExtension. CustUnit.. is not original class. Also, second option is correct because it was mentioned that extended class static method should be called.

upvoted 1 times

Bulhy

4 years ago

Please, stop misleading other users.. I need to correct you again, because your are wrong here as well. If you extend a class via [ExtensionOf], the extension class you are creating MUST end with "_Extension" suffix and HAS TO be final, these two are the only requirements that will throw error on compilation, if not satisfied! The naming convention is different topic here. We might argue about "CustUnitConv" being correctly named or not, but it is the only correct answer out of given options, that will not thrown an error on compilation. So "final class CustUnitConv_Extension" is correct answer. As of the second box, the answer is marked correctly "var km = UnitConv::MiToKm(62.1371);", since you use the original/extended class "UnitConv" to call a static method (UnitConv::MiToKm).

upvoted 10 times

juozapyne

3 years, 11 months ago

a. does not meet Naming guidelines for extensions https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/extensibility/class-extensions b. does not meet Class extension model in X++ "Extension classes are final classes that are adorned with the ExtensionOf attribute and that also have a name that has the _Extension suffix. (This restriction on the naming might be removed later.) The name of the extension class is otherwise unimportant. " https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/extensibility/class-extensions

upvoted 1 times

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