Multicast delegates in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a multicast delegate in C#?

A multicast delegate is a delegate that holds references to more than one method. When invoked, it calls all the methods it references in order.

beginner

How do you add methods to a multicast delegate?

You use the '+=' operator to add methods to a multicast delegate, combining them into a single delegate instance.

intermediate

What happens if one method in a multicast delegate throws an exception?

If a method in a multicast delegate throws an exception, the invocation stops and the exception is propagated. Methods after the exception are not called.

beginner

How can you remove a method from a multicast delegate?

You use the '-=' operator to remove a method from a multicast delegate, detaching it from the invocation list.

intermediate

What is the return value of a multicast delegate invocation?

For multicast delegates with a return type, only the return value of the last method called is returned.

Which operator is used to add a method to a multicast delegate in C#?

A *=

B -=

C +=

D /=

The '+=' operator adds a method to the invocation list of a multicast delegate.

What happens when you invoke a multicast delegate?

A Only the first method is called

B Only the last method is called

C No methods are called

D All methods in the invocation list are called in order

Invoking a multicast delegate calls all methods it references, in the order they were added.

If a method in a multicast delegate throws an exception, what happens?

A Invocation stops and the exception is thrown

B The exception is ignored

C All methods continue to run

D Only the last method runs

If any method throws an exception, the multicast delegate stops invoking further methods and propagates the exception.

How do you remove a method from a multicast delegate?

A +=

B -=

C *=

D /=

The '-=' operator removes a method from the multicast delegate's invocation list.

What return value does a multicast delegate provide when invoked?

A Return value of the last method

B Return values of all methods combined

C Return value of the first method

D No return value

Only the return value of the last method called by the multicast delegate is returned.

Explain what a multicast delegate is and how it works in C#.

Think about how one delegate can call many methods.

Describe how to add and remove methods from a multicast delegate and what happens when it is invoked.

Focus on the operators and the invocation process.