C# Quiz-6(Events & Delegates)

C# Quiz-6(Events & Delegates)

1.A(an)...is the encapsulation of the idea that "something happened" to which the program must respond. event delegate event-delegate model None of above 2.-= operator is used to remove a delegate from a (possibly composite) field. True False 3. What will be output of following program? delegate void MyDelegate(int i); class Program { public static void Main() { TakesADelegate(new MyDelegate(DelegateFunction)); } public static void TakesADelegate(MyDelegate SomeFunction) { SomeFunction(21); } public static void DelegateFunction(int i) { System.Console.WriteLine("Called by delegate with number: {0}.", i); } } Compile time error Called by delegate with number: 21. Runtime error None of above 4.Suppose on pushing a button an object is to be notified, but it is not known until runtime which object should be notified. Which of the following programming constructs should be used to implement this idea? Attribute Delegate Namespace Interface 5.Which of the following statements are correct about delegates? Delegates cannot be used to call a static method of a class. Delegates cannot be used to call procedures that receive variable number of arguments. If signatures of two methods are same they can be called through the same delegate object. Delegates cannot be used to call an instance function. Delegates cannot be used to call an instance subroutine. 6.delegate is a.... reference type value type both none of above 7.A delegate defines.... a means of passing arrays into methods a substitue for an inherited method a class that encapsulates methods None of above 8.An Event is The result of a users action result of a party code to force users action None of above 9.An event declaration defines a type that encapsulates a method with a particular set of arguments and return type. True False 10.A delegate can either be called asynchronously by using BeginInvoke and EndInvoke methods. True False