Explicit interface implementation in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to explicitly implement the interface method.

C Sharp (C#)

interface IExample {
    void Show();
}

class Demo : IExample {
    void IExample.[1]() {
        Console.WriteLine("Explicit implementation");
    }
}

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

AShow

BDisplay

CShowMessage

DPrint

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than the interface method.

Forgetting to prefix the method with the interface name.

The method name must match the interface method exactly for explicit implementation.

2fill in blank

medium

Complete the code to call the explicitly implemented interface method from an interface reference.

C Sharp (C#)

interface IExample {
    void Show();
}

class Demo : IExample {
    void IExample.Show() {
        Console.WriteLine("Explicit implementation");
    }
}

class Program {
    static void Main() {
        Demo obj = new Demo();
        IExample iobj = obj;
        iobj.[1]();
    }
}

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

AShow

BDisplay

CPrint

DShowMessage

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call the method directly from the class instance.

Using a wrong method name.

You must call the interface method name through the interface reference.

3fill in blank

hard

Fix the error in the explicit interface implementation method signature.

C Sharp (C#)

interface IExample {
    void Show();
}

class Demo : IExample {
    void IExample.[1]() {
        Console.WriteLine("Explicit implementation");
    }
}

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

AShowMessage

BDisplay

CPrint

DShow

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 'public' or other access modifiers to explicit interface methods.

Using a different method name than the interface.

Explicit interface implementations cannot have access modifiers like 'public'.

4fill in blank

hard

Fill both blanks to explicitly implement two interface methods correctly.

C Sharp (C#)

interface IFirst {
    void MethodA();
}
interface ISecond {
    void MethodB();
}

class Demo : IFirst, ISecond {
    void IFirst.[1]() {
        Console.WriteLine("First method");
    }
    void ISecond.[2]() {
        Console.WriteLine("Second method");
    }
}

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

AMethodA

BMethodC

CMethodB

DMethodD

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up method names between interfaces.

Using incorrect method names.

Each method must match its interface method name exactly for explicit implementation.

5fill in blank

hard

Fill all three blanks to explicitly implement an interface and call its method correctly.

C Sharp (C#)

interface IExample {
    void Show();
}

class Demo : IExample {
    void IExample.[1]() {
        Console.WriteLine("Explicit implementation");
    }
}

class Program {
    static void Main() {
        Demo obj = new Demo();
        IExample iobj = [2];
        iobj.[3]();
    }
}

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

AShow

Bobj

Ddemo

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names for the interface reference.

Calling the method directly from the class instance instead of the interface reference.

The method name must match the interface method, the interface reference must be assigned correctly, and the method called must be the interface method.