LINQ with custom objects in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to select all names from the list of people.

C Sharp (C#)

var names = people.Select(person => person.[1]);

Drag options to blanks, or click blank then click option'

AGetHashCode()

BAge

CToString()

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Selecting Age instead of Name.

Using methods like ToString() which return a string but are not properties.

The Name property holds the person's name, which we want to select.

2fill in blank

medium

Complete the code to filter people older than 30.

C Sharp (C#)

var olderThan30 = people.Where(person => person.[1] > 30);

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AName

BToString()

CAge

DLength

Attempts:

3 left

💡 Hint

Common Mistakes

Using Name property instead of Age.

Trying to use Length which is not a property of Person.

The Age property holds the person's age, which we compare to 30.

3fill in blank

hard

Fix the error in the LINQ query to order people by their age.

C Sharp (C#)

var ordered = people.OrderBy(person => person.[1]);

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AAge

BCount

CName

DLength

Attempts:

3 left

💡 Hint

Common Mistakes

Using Name to order when age is required.

Using Count or Length which are not properties of Person.

Ordering by Age sorts people by their age correctly.

4fill in blank

hard

Fill both blanks to create a dictionary with names as keys and ages as values for people older than 25.

C Sharp (C#)

var dict = people.Where(p => p.[1] > 25).ToDictionary(p => p.[2], p => p.Age);

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AAge

BName

CToString()

DLength

Attempts:

3 left

💡 Hint

Common Mistakes

Using Name instead of Age in the filter.

Using ToString() or Length which are not suitable here.

Filter by Age > 25, then use Name as dictionary keys.

5fill in blank

hard

Fill all three blanks to select uppercase names of people younger than 40.

C Sharp (C#)

var result = people.Where(p => p.[1] < 40).Select(p => p.[2].[3]());

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AAge

BName

CToUpper

DToLower

Attempts:

3 left

💡 Hint

Common Mistakes

Using ToLower instead of ToUpper.

Using Name in the filter instead of Age.

Filter by Age less than 40, select Name, then convert to uppercase with ToUpper().