Creating instances dynamically in C Sharp (C#) - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an instance of the class Person.

C Sharp (C#)

Person person = new [1]();

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

Aperson

Bnew

CPerson

Dclass

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable name instead of the class name.

Omitting the parentheses after the class name.

To create an instance of a class, you use the class name after the new keyword.

2fill in blank

medium

Complete the code to create an instance dynamically using Activator.CreateInstance.

C Sharp (C#)

object obj = Activator.CreateInstance(typeof([1]));

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APerson

BActivator

Cobject

DCreateInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the variable name instead of the class name.

Forgetting to use typeof().

You pass the type of the class you want to create an instance of to Activator.CreateInstance using typeof(ClassName).

3fill in blank

hard

Fix the error in the code to create an instance dynamically with a parameterless constructor.

C Sharp (C#)

var instance = (Person)Activator.CreateInstance([1]);

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Atypeof(Person)

BActivator

Cnew Person()

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the class name as a string or identifier without typeof().

Trying to pass an instance instead of a type.

You must pass a Type object to CreateInstance, so use typeof(Person).

4fill in blank

hard

Fill both blanks to create an instance dynamically and cast it to the correct type.

C Sharp (C#)

var instance = ([1])Activator.CreateInstance([2]);

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

APerson

Btypeof(Person)

Cobject

DActivator

Attempts:

3 left

💡 Hint

Common Mistakes

Casting to object instead of the class type.

Passing the class name without typeof().

You cast the created object to the class type and pass the type using typeof().

5fill in blank

hard

Fill all three blanks to create an instance dynamically with parameters using Activator.CreateInstance.

C Sharp (C#)

var instance = ([1])Activator.CreateInstance([2], new object[] { [3] });

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

APerson

Btypeof(Person)

C"John"

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Not casting the result to the class type.

Passing constructor arguments incorrectly.

Forgetting to use typeof().

You cast to the class type, pass the type with typeof(), and provide constructor arguments as an object array.