C Sharp (C#) - LINQ Fundamentals
Which method should you use if you want to get a single element from a collection and ensure there is exactly one match?
Which method should you use if you want to get a single element from a collection and ensure there is exactly one match?
easy🧠 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Single() purpose
TheSingle()method returns the only element of a collection and throws an exception if there is not exactly one element.Step 2: Compare with other methods
First()returns the first element regardless of how many exist,FirstOrDefault()returns first or default, andLast()returns the last element.Final Answer:
Single() -> Option AQuick Check:
Single() ensures exactly one element [OK]
Quick Trick: Use Single() to enforce exactly one matching element [OK]
Common Mistakes:
MISTAKES- Using First() when multiple matches exist
- Expecting Single() to return default if none found
- Confusing Single() with FirstOrDefault()
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