Collection initialization syntax in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize a list of integers with values 1, 2, and 3.

C Sharp (C#)

var numbers = new List<int> [1] 1, 2, 3 [2];

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

A{

B[

C}

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses () instead of curly braces {} for collection initialization.

Using square brackets [] which are for arrays, not collections.

In C#, collection initializers use curly braces { } to list the elements inside the new collection.

2fill in blank

medium

Complete the code to initialize a dictionary with keys "apple" and "banana" and values 1 and 2.

C Sharp (C#)

var fruitCounts = new Dictionary<string, int> [1] {"apple", 1}, {"banana", 2} [2];

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

A{

B[

C}

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses () instead of curly braces {} for dictionary initialization.

Using square brackets [] which are not valid for dictionary initializers.

Dictionaries use curly braces { } with key-value pairs inside for initialization.

3fill in blank

hard

Fix the error in the code to correctly initialize a list of strings with "red", "green", and "blue".

C Sharp (C#)

var colors = new List<string> [1] "red", "green", "blue" [2];

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

A[

B{

C}

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets [] which are for arrays, not collections.

Using parentheses () which are for method calls, not initializers.

Collection initializers require curly braces { } around the elements after the new keyword.

4fill in blank

hard

Fill both blanks to initialize a dictionary with keys 1 and 2 and values "one" and "two".

C Sharp (C#)

var numbers = new Dictionary<int, string> [1] {1, "one"}, {2, "two"} [2];

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

A{

B[

C}

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets [] or parentheses () instead of curly braces.

Forgetting to close the initializer with the correct brace.

Dictionary initializers use curly braces { } to enclose the key-value pairs.

5fill in blank

hard

Fill the two blanks to initialize a list of tuples with (1, "one"), (2, "two"), and (3, "three").

C Sharp (C#)

var list = new List<(int, string)> [1] (1, "one"), (2, "two"), (3, "three") [2];

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

A{

B}

C;

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of curly braces for the initializer.

Collection initializers use curly braces { } around the elements.