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  • Delegates - General Questions
1. 

Which of the following statements is incorrect about delegate?
A. Delegates are reference types.
B. Delegates are object oriented.
C. Delegates are type-safe.
D. Delegates serve the same purpose as function pointers in C and pointers to member function operators in C++.
E. Only one method can be called using a delegate.
2. 

In which of the following areas are delegates commonly used?

  1. Remoting
  2. Serialization
  3. File Input/Output
  4. Multithreading
  5. Event handling

A. 1 and 2 only
B. 1 and 5 only
C. 1, 2 and 3 only
D. 4 and 5 only
E. All of the above
3. 

Which of the following is the necessary condition for implementing delegates?
A. Class declaration
B. Inheritance
C. Run-time Polymorphism
D. Exceptions
E. Compile-time Polymorphism
4. 

Which of the following statements are correct about the delegate declaration given below? 

    delegate void del(int i);
  1. On declaring the delegate a class called del will get created.
  2. The signature of del need not be same as the signature of the method that we intend to call using it.
  3. The del class will be derived from the MulticastDelegate class.
  4. The method that can be called using del should not be a static method.
  5. The del class will contain a one-argument constructor and an lnvoke() method.

A. 1, 2 and 3 only
B. 1, 3 and 5 only
C. 2 and 4 only
D. 4 only
E. All of the above
5. 

Which of the following is the correct way to call the function MyFun() of the Sample class given below? 

class Sample
{
    public int MyFun(int i)
    {
        Console.WriteLine("Welcome to IndiaBIX.com !" );
        return 0;
    }
}
A. 
delegate void del(int i);
Sample s = new Sample();
deld = new del(ref s.MyFun);
d(10);
B. 
delegate int del(int i);
Sample s = new Sample(.);
del = new delegate(ref MyFun);
del(10);
C. 
Sample s = new Sample();
delegate void del = new delegate(ref MyFun);
del(10);
D. 
delegate int del(int i);
del d;
Sample s = new Sample();
d = new del(ref s.MyFun);
d(10);