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 variable that stores a reference to a method.

A type of class that inherits from another class.

A built-in method for handling exceptions.

A special type of loop for iterating over arrays.

None

What does a method's signature consist of?

The method’s parameters and exceptions.

The method’s name and class.

The method’s return type and access modifier.

The method’s return type and parameters.

None

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

delegate ();

class : delegate() {}

void delegate ();

delegate void ()

None

How is a delegate instantiated?

By referencing a variable inside the class.

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

By calling the delegate directly.

Using the typeof keyword followed by the delegate name.

None

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

It can only be passed as an argument.

It references multiple methods.

It returns void by default.

It references only one method.

None

What is a multicast delegate?

A delegate that can reference multiple methods.

A delegate that must return an integer.

A delegate that does not accept any parameters.

A delegate that only works with arrays.

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?

Only the first method referenced by the delegate is called.

It calls the methods in random order.

All methods referenced by the delegate are called in order.

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

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 void CallDelegate() { delegate(); }

public static void DisplayText(StringConverter converter)

public static void DisplayText(int value)

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

None

11.

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

Delegates make the program run faster.

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

Delegates automatically handle errors.

Delegates prevent code from being overwritten.

None

12.

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

delegate string StringConverter(string value);

public delegate void StringConverter();

public string StringConverter(string value);

delegate void StringConverter();

None

13.

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

The last method will overwrite the first.

The program will raise an error.

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 delegate keyword without the method name.

Using the method keyword.

Using the new keyword without a method name.

Using the new keyword and specifying the method name.

None

15.

What is the main purpose of delegates in C#?

To handle memory management automatically.

To reference and invoke methods dynamically.

To control data types and enforce strict typing.

To create loops in C# programs.

None

16.

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

function

delegate

method

class

None

17.

Can a delegate reference multiple methods in C#?

No, delegates only work for static methods.

No, delegates can only reference one method.

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 delegate will automatically adjust to the method’s signature.

The program will raise a runtime error.

The program will skip the method call.

The program will not compile.

None

19.

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

Single-cast delegates and multicast delegates.

Only single-cast delegates.

Only multicast delegates.

Only static 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 delegate will be ignored and not called.

The method will run but return incorrect results.

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 are used to define and trigger event methods.

Delegates automatically manage memory for events.

Delegates create loops to listen for events.

None

22.

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

It prevents the need for return values.

It simplifies error handling in methods.

It ensures that methods always return a boolean value.

It allows different methods to be passed and executed dynamically.

None

23.

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

A default value of 0.

The return value of the referenced method.

The delegate signature.

The name of the method.

None

Time’s up

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