Fluent interface with extensions in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a fluent method that returns the same object.

C Sharp (C#)

public class Builder {
    public Builder SetName(string name) {
        // set name logic
        return [1];
    }
}

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

Athis

Bname

CBuilder

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the parameter 'name' instead of the object.

Returning null which breaks the chain.

The fluent interface returns 'this' to allow chaining calls on the same object.

2fill in blank

medium

Complete the extension method to add a fluent method to the Builder class.

C Sharp (C#)

public static class BuilderExtensions {
    public static Builder [1](this Builder builder, int age) {
        // set age logic
        return builder;
    }
}

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

ASetAge

BAddAge

CWithAge

DAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that does not clearly indicate its purpose.

Omitting the 'this' keyword in the parameter.

Extension methods typically use descriptive names like 'SetAge' to indicate setting a property.

3fill in blank

hard

Fix the error in the extension method to correctly return the builder for chaining.

C Sharp (C#)

public static Builder SetHeight(this Builder builder, double height) {
    builder.Height = height;
    return [1];
}

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

Aheight

Bthis

Cbuilder

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the property value instead of the builder.

Returning 'this' inside a static method which is invalid.

The method must return the 'builder' object to continue the fluent chain.

4fill in blank

hard

Fill both blanks to create a fluent extension method that sets a string property and returns the builder.

C Sharp (C#)

public static Builder [1](this Builder builder, string city) {
    builder.[2] = city;
    return builder;
}

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

ASetCity

BCity

CCityName

DSetLocation

Attempts:

3 left

💡 Hint

Common Mistakes

Using the property name as the method name.

Setting a property that does not exist.

The method name 'SetCity' matches the fluent style, and the property 'CityName' is set inside the method.

5fill in blank

hard

Fill all three blanks to create a fluent extension method that sets an integer property with validation and returns the builder.

C Sharp (C#)

public static Builder [1](this Builder builder, int score) {
    if (score [2] 0) {
        builder.[3] = score;
    }
    return builder;
}

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

ASetScore

B>

CScore

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Setting a property with a different name.

The method 'SetScore' sets the 'Score' property only if the score is greater than 0, then returns the builder.