[Solved] Why might using Average() on an empty list cause an error in C#? - Ans: Because Average() cannot compute a value with zero elements and throws an... | C Sharp (C#)

C Sharp (C#) - LINQ Fundamentals

Why might using Average() on an empty list cause an error in C#?

ABecause Sum() must be called before Average()

BBecause Average() returns zero automatically for empty lists

CBecause Count() must be called before Average()

DBecause Average() cannot compute a value with zero elements and throws an exception

Step-by-Step Solution

Solution:

Step 1: Understand behavior on empty collections
Calling Average() on an empty list causes an InvalidOperationException because there are no elements to average.
Step 2: Differentiate from other functions
Sum() returns 0 on empty lists, but Average() throws an error.
Final Answer:
Because Average() cannot compute a value with zero elements and throws an exception -> Option D
Quick Check:
Average() on empty list throws exception [OK]

Quick Trick: Average() fails on empty lists, handle carefully [OK]

Common Mistakes:

MISTAKES

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Why might using Average() on an empty list cause an error in C#?