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Exam 70-483 topic 1 question 12 discussion

Actual exam question from Microsoft's 70-483

Question #: 12
Topic #: 1

DRAG DROP -
You are developing a class named ExtensionMethods.
You need to ensure that the ExtensionMethods class implements the IsEmail() method on string objects.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
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by FutureMfana at Jan. 23, 2020, 4:19 a.m.

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tanujgyan

Highly Voted 5 years, 4 months ago

The answer in solution is correct

upvoted 5 times

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devpride

Most Recent 4 years, 9 months ago

correction: remove phrase "be good if such mistakes sometimes"...my mistake!

upvoted 1 times

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devpride

4 years, 9 months ago

Question talks about IsEmail() whereas the screenshot showing in question shows IsUrl()? I know its simple thing, but it would be good if such mistakes sometimes leads confusion and takes time to re-think again thinking that did we really miss anything here and go back to read the same question again and again? weird right?

upvoted 1 times

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zzMichielzz

4 years, 9 months ago

public static class this String str

upvoted 2 times

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lh2607

5 years ago

public static class ExtensionMethods this String str

upvoted 1 times

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XardasLord

5 years, 2 months ago

In question there is 'IsEmail() method

upvoted 3 times

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robinnirola

5 years, 3 months ago

public static ExtensionClass this string str

upvoted 1 times

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robinnirola

5 years, 3 months ago

public static Extension this string str

upvoted 3 times

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whyjtrees

5 years, 6 months ago

Because it is extension method, you need this keyword

upvoted 2 times

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FutureMfana

5 years, 6 months ago

Why would include this keyword on declarations? I thought the answer would be String str. I stand to be correct gurus

upvoted 2 times

tanujgyan

5 years, 4 months ago

Thats the way "extension methods" work. The syntax asks you to use this

upvoted 3 times

jan_oratowski

4 years, 8 months ago

This extension method would be used in something like that: string maybeUrl = "abcd"; bool isItString = maybeUrl.IsUrl(); In order to tell the compiler that you want to use the method on a string object without passing the string object between (), you have to add "this". You do that, because there may be more than just one parameter and then compiler will not know which parameter should be used. Otherwise it would be: bool isItString = IsUrl(maybeUrl);

upvoted 1 times

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