Generic interfaces in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a generic interface named IRepository.

C Sharp (C#)

public interface [1]<T> { void Add(T item); }

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AIRepository

BICollection

CIList

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name instead of interface name.

Omitting the generic type parameter .

Not starting interface name with 'I'.

The generic interface is named IRepository to follow common C# naming conventions.

2fill in blank

medium

Complete the code to implement the generic interface IRepository for a class named Repository.

C Sharp (C#)

public class Repository<T> : [1]<T> { public void Add(T item) { /* implementation */ } }

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AIEnumerable

BIRepository

CICollection

DIList

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-generic interface.

Forgetting to specify the generic type parameter .

Using a different interface name.

The class Repository implements the generic interface IRepository with the same type parameter T.

3fill in blank

hard

Fix the error in the interface method declaration to make it generic.

C Sharp (C#)

public interface IRepository<T> { void [1](T item); }

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AAppend

BInsert

CAddItem

DAdd

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that are not standard or expected.

Using names that do not clearly indicate adding an item.

The method name Add matches the common naming convention for adding an item to a collection.

4fill in blank

hard

Fill both blanks to declare a generic interface with a method that returns an item by index.

C Sharp (C#)

public interface [1]<T> { T [2](int index); }

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AIRepository

BGetItem

CGet

DIList

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name instead of interface name.

Using a method name that is too long or unclear.

The interface is named IRepository and the method to get an item by index is commonly named Get.

5fill in blank

hard

Fill all three blanks to implement a generic interface with Add and Get methods in a class.

C Sharp (C#)

public class [1]<T> : [2]<T> { private List<T> items = new List<T>(); public void Add(T item) { items.Add(item); } public T [3](int index) { return items[index]; } }

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

ARepository

BIRepository

CGet

DIList

Attempts:

3 left

💡 Hint

Common Mistakes

Using interface name as class name.

Forgetting to implement the interface.

Using incorrect method names.

The class Repository implements the interface IRepository and defines the method Get to retrieve items by index.