Which statement best describes how LINQ method syntax handles duplicate keys when using ToDictionary?

hard🧠 Conceptual Q10 of Q15

C Sharp (C#) - LINQ Fundamentals

Which statement best describes how LINQ method syntax handles duplicate keys when using ToDictionary?

AIt automatically merges values of duplicate keys

BIt keeps the first key-value pair and ignores duplicates

CIt throws an exception if duplicate keys exist

DIt keeps the last key-value pair and overwrites duplicates

Step-by-Step Solution

Solution:

Step 1: Understand ToDictionary behavior
ToDictionary requires unique keys; duplicates cause errors.
Step 2: Check handling of duplicates
It throws an exception rather than merging or ignoring duplicates.
Final Answer:
It throws an exception if duplicate keys exist -> Option C
Quick Check:
ToDictionary duplicates cause exception [OK]

Quick Trick: ToDictionary needs unique keys or throws error [OK]

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