static void Main(string[] args)
{
Console.WriteLine("***A case study with overloaded methods.***");
DelegateWithTwoIntParameterReturnInt delOb = Sum;
Console.WriteLine("\nCalling Sum(..) method using a delegate.");
int total = delOb(10, 20);
Console.WriteLine("Sum of 10 and 20 is: {0}", total);
Console.ReadKey();
}
static void Main(string[] args)
{
Console.WriteLine("***A simple delegate demo.***");
Console.WriteLine("\n Calling Sum(..) method without using a delegate:");
Console.WriteLine("Sum of 10 and 20 is : {0}", Sum(10, 20));
//Creating a delegate instance
//DelegateWithTwoIntParameterReturnInt delOb = new DelegateWithTwoIntParameterReturnInt(Sum);
//Or,simply write as follows:
DelegateWithTwoIntParameterReturnInt delOb = Sum;
Console.WriteLine("\nCalling Sum(..) method using a delegate.");
int total = delOb(10, 20);
Console.WriteLine("Sum of 10 and 20 is: {0}", total);
//Alternative way to calculate the aggregate of the numbers.
//delOb(25,75) is shorthand for delOb.Invoke(25,75)
Console.WriteLine("\nUsing Invoke() method on delegate instance, calculating sum of 25 and 75.");
total = delOb.Invoke(25, 75);
Console.WriteLine("Sum of 25 and 75 is: {0}", total);
Console.ReadKey();
}
static void Main(string[] args)
{
Console.WriteLine("***Comparing the behavior of a static method and instance method when assign them to a delegate instance.***");
Console.WriteLine("Assigning a static method to a delegate object.");
//Assigning a static method to a delegate object.
DelegateWithTwoIntParameterReturnInt delOb = Sum;
Console.WriteLine("Calling Sum(..) method of Program Class using a delegate.");
int total = delOb(10, 20);
Console.WriteLine("Sum of 10 and 20 is: {0}", total);
Console.WriteLine("delOb.Target={0}", delOb.Target);
Console.WriteLine("delOb.Target==null? {0}", delOb.Target == null); //true
Console.WriteLine("delOb.Method={0}", delOb.Method); //delOb.Method=Int32 Sum(Int32, Int32)
OutSideProgram outsideOb = new OutSideProgram();
////For Q&A 1.9
//ConsGenerator consGenerator = () =>
//{
// return new OutSideProgram();
//};
//consGenerator();
Console.WriteLine("\nAssigning an instance method to a delegate object.");
//Assigning an instance method to a delegate object.
delOb = outsideOb.CalculateSum;
Console.WriteLine("Calling CalculateSum(..) method of OutsideProgram class using a delegate.");
total = delOb(50, 70);
Console.WriteLine("Sum of 50 and 70 is: {0}", total);
Console.WriteLine("delOb.Target={0}", delOb.Target); //delOb.Target=DelegateEx1.OutSideProgramClass
Console.WriteLine("delOb.Target==null? {0}", delOb.Target == null); //false
Console.WriteLine("delOb.Method={0}", delOb.Method); //delOb.Method=Int32 Sum(Int32, Int32)
Console.ReadKey();
}
