[Solved] Which of the following best describes the return type of GroupBy in C#? - Ans: An IEnumerable of groups, each with a key and a collection of elements | C Sharp (C#)

C Sharp (C#) - LINQ Fundamentals

Which of the following best describes the return type of GroupBy in C#?

AA List of keys only

BA single grouped collection without keys

CAn IEnumerable of groups, each with a key and a collection of elements

DA Dictionary with keys and single elements

Step-by-Step Solution

Solution:

Step 1: Recall GroupBy return type
The GroupBy method returns an IEnumerable<IGrouping<TKey, TElement>>, where each group has a key and a collection of elements.
Step 2: Eliminate incorrect options
It is not just keys, nor a single collection, nor a dictionary with single elements.
Final Answer:
An IEnumerable of groups, each with a key and a collection of elements -> Option C
Quick Check:
GroupBy return type = IEnumerable of groups [OK]

Quick Trick: GroupBy returns groups with keys and collections, not just keys [OK]

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Which of the following best describes the return type of GroupBy in C#?