Understanding Delegates and Events

What is a delegate in .NET?

• A class that encapsulates a method.

• A type of variable.

• A method that returns a value.

• A collection of objects.

What keyword is used to declare a delegate?

• delegate

• method

• function

• class

What is the purpose of the new keyword when instantiating a delegate?

• To create a new instance of the delegate.

• To call the delegate.

• To declare the delegate.

• To remove the delegate.

What is a generic delegate?

• A delegate that can reference methods of different types.

• A delegate that can only reference one type.

• A delegate that does not return a value.

• A delegate that is static.

What is the difference between delegates and interfaces?

• Delegates are safe callbacks; interfaces can implement methods.

• Delegates can implement methods multiple times; interfaces cannot.

• Delegates are faster to execute; interfaces are slower.

• There is no difference.

What is an event in C#.NET?

• A member of a class that is fired when a specific action occurs.

• A method that returns a value.

• A type of delegate.

• A collection of objects.

What is the syntax for declaring an event?

• public event delegate_name event_name;

• public delegate event_name;

• event event_name;

• delegate event_name;

What does the += operator do in event handling?

• Adds a delegate to an event.

• Removes a delegate from an event.

• Declares a new event.

• Calls an event.

What are event accessors?

• Methods that allow adding and removing event subscriptions.

• Methods that declare an event.

• Methods that call a delegate.

• Methods that return a value.

What is the purpose of the SortedList class?

• To store key or value pairs where the key values sort values.

• To represent a Last In, First Out (LIFO) collection.

• To represent a First In, First Out (FIFO) collection.

• To loop through elements in a collection.