C# Delegates Quiz

Welcome to the C# Delegates Quiz! This quiz will test your understanding of delegates, a powerful feature in C# that allows methods to be referenced and invoked dynamically. Delegates are essential for writing flexible, reusable code and are commonly used in event handling and method callbacks. In this quiz, you will explore key concepts such as delegate declarations, single-cast and multicast delegates, passing delegates to methods, and how delegates enhance method flexibility. Take your time, and good luck with your learning journey!

What is a delegate in C#?

A built-in method for handling exceptions.

A special type of loop for iterating over arrays.

A type of class that inherits from another class.

A variable that stores a reference to a method.

None

What does a method's signature consist of?

The method’s return type and access modifier.

The method’s return type and parameters.

The method’s name and class.

The method’s parameters and exceptions.

None

Which of the following is the correct syntax for declaring a delegate?

delegate ();

void delegate ();

delegate void ()

class : delegate() {}

None

How is a delegate instantiated?

Using the new keyword and passing a method with the same signature.

Using the typeof keyword followed by the delegate name.

By referencing a variable inside the class.

By calling the delegate directly.

None

What does it mean if a delegate is a single-cast delegate?

It returns void by default.

It references only one method.

It references multiple methods.

It can only be passed as an argument.

None

What is a multicast delegate?

A delegate that does not accept any parameters.

A delegate that can reference multiple methods.

A delegate that only works with arrays.

A delegate that must return an integer.

None

How can you combine delegates to create a multicast delegate?

By using the && operator.

By using the + operator.

By using the * operator.

By using the || operator.

None

What happens when you call a multicast delegate?

All methods referenced by the delegate are called in order.

It calls the methods in random order.

The delegate will raise an exception if it references more than one method.

Only the first method referenced by the delegate is called.

None

How can you remove a method from a multicast delegate?

By using the – operator.

By using the remove method.

By re-declaring the delegate.

By using the / operator.

None

10.

Which of the following is an example of passing a delegate to a method?

public static void DisplayText(StringConverter converter)

public delegate int Sum(int a, int b);

public static void DisplayText(int value)

public void CallDelegate() { delegate(); }

None

11.

What is a key advantage of using delegates in C#?

Delegates prevent code from being overwritten.

Delegates allow methods to be passed as arguments to other methods.

Delegates make the program run faster.

Delegates automatically handle errors.

None

12.

How do you declare a delegate that takes a string parameter and returns a string?

public delegate void StringConverter();

public string StringConverter(string value);

delegate void StringConverter();

delegate string StringConverter(string value);

None

13.

What will happen when you execute a multicast delegate containing two methods?

The program will raise an error.

The last method will overwrite the first.

Both methods will be called in sequence.

Only the first method will be called.

None

14.

How can you assign a method to a delegate in C#?

Using the new keyword without a method name.

Using the delegate keyword without the method name.

Using the new keyword and specifying the method name.

Using the method keyword.

None

15.

What is the main purpose of delegates in C#?

To create loops in C# programs.

To handle memory management automatically.

To control data types and enforce strict typing.

To reference and invoke methods dynamically.

None

16.

Which keyword is used to declare a delegate in C#?

class

function

method

delegate

None

17.

Can a delegate reference multiple methods in C#?

No, delegates can only reference one method.

No, delegates only work for static methods.

Yes, but only for methods with void return types.

Yes, through the use of a multicast delegate.

None

18.

What happens if a delegate does not match the method's signature?

The program will skip the method call.

The delegate will automatically adjust to the method’s signature.

The program will raise a runtime error.

The program will not compile.

None

19.

What type of delegate can be used to reference both static and instance methods?

Only static delegates.

Only single-cast delegates.

Single-cast delegates and multicast delegates.

Only multicast delegates.

None

20.

What will happen if you try to invoke a delegate with a mismatched method signature?

The program will automatically adjust the arguments.

The method will run but return incorrect results.

The delegate will be ignored and not called.

The program will fail to compile.

None

21.

What is the purpose of using delegates in event handling?

Delegates enforce exception handling during events.

Delegates create loops to listen for events.

Delegates automatically manage memory for events.

Delegates are used to define and trigger event methods.

None

22.

How does passing a delegate as a method parameter increase flexibility?

It prevents the need for return values.

It allows different methods to be passed and executed dynamically.

It simplifies error handling in methods.

It ensures that methods always return a boolean value.

None

23.

What does a delegate return if it references a method with a return type?

The name of the method.

The return value of the referenced method.

A default value of 0.

The delegate signature.

None

Time’s up

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