C Sharp (C#) - LINQ Fundamentals
Identify the error in this code snippet:
var items = new List<string> { "apple", "banana", "apple" };
var singleItem = items.Single(x => x == "apple");
Console.WriteLine(singleItem);Identify the error in this code snippet:
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze Single() with multiple matches
Single() throws InvalidOperationException if more than one element matches the predicate.Step 2: Check list contents
List has two "apple" strings, so Single() throws exception.Final Answer:
Throws InvalidOperationException due to multiple matches -> Option CQuick Check:
Single() throws on multiple matches [OK]
Quick Trick: Single() throws if more than one match found [OK]
Common Mistakes:
MISTAKES- Expecting Single() to return first match
- Thinking it returns null on duplicates
- Assuming syntax error in lambda
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