Given the class Person { public string Name; public int Age; } and a list people containing: John(20), Lisa(40), and Mark(35), what will this LINQ query return?

medium📝 Predict Output Q4 of 15

C Sharp (C#) - LINQ Fundamentals

Given the class Person { public string Name; public int Age; } and a list people containing: John(20), Lisa(40), and Mark(35), what will this LINQ query return?

var result = people.Where(p => p.Age < 30).Select(p => p.Name);

AA list containing "John"

BA list containing "Lisa" and "Mark"

CA list containing "John" and "Mark"

DAn empty list

Step-by-Step Solution

Solution:

Step 1: Understand the Where clause
The condition is p.Age < 30, so only persons younger than 30 are selected.
Step 2: Identify matching persons
John is 20 (matches), Lisa is 40 (does not match), Mark is 35 (does not match).
Step 3: Select names
Only John's name is selected.
Final Answer:
A list containing "John" -> Option A
Quick Check:
Check ages against condition < 30 [OK]

Quick Trick: Filter first, then select properties [OK]

Common Mistakes:

MISTAKES

Including persons who do not meet the age condition
Confusing < with > in the condition
Selecting the whole object instead of just the name

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More C Sharp (C#) Quizzes

Given the class Person { public string Name; public int Age; } and a list people containing: John(20), Lisa(40), and Mark(35), what will this LINQ query return?

Step 1: Understand the Where clause

Step 2: Identify matching persons

Step 3: Select names

Final Answer:

Quick Check:

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