Exam 70-483 topic 1 question 47 discussion

Actual exam question from Microsoft's 70-483

Question #: 47
Topic #: 1

DRAG DROP -
You are developing a class named ExtensionMethods.
You need to ensure that the ExtensionMethods class implements the IsEmail() extension 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 ppp at Jan. 9, 2020, 11:36 a.m.

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wingchuihk

4 years, 10 months ago

public static class ExtensionMethods(this String str)

upvoted 1 times

Damage_San

4 years, 9 months ago

sorry this is wrong, you can't pass parameters into the class declaration like that

upvoted 3 times

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dominikeps

5 years, 5 months ago

An extension method is a static method of a static class, where the "this" modifier is applied to the first parameter

upvoted 1 times

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ppp

5 years, 5 months ago

Why not "String str"?

upvoted 1 times

nfdevil

5 years, 5 months ago

An Extension method extends a type, so the this makes sure you can do obj.<method> where the variable in this is the context https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/extension-methods

upvoted 5 times

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