static void Main(string[] args)
{
var calc = new SimpleCalculator();
int result;
PerformCalculation calcReference;
/*calcReference = calc.Sum;
* result = calcReference(10, 15);
* Console.WriteLine(result);*/
//DoCalculation(10, 15, calc.Sum);
//DoCalculation(10, 15, calc.Multiply);
PerformCalculation first = calc.Sum;
PerformCalculation second = calc.Multiply;
second = (PerformCalculation)Delegate.Combine(first, second);
result = second(10, 15);
Console.WriteLine(result);
result = second.Invoke(20, 20);
Console.WriteLine(result);
PerformCalculation emptyCalculation = null; //NullReferenceException
result = emptyCalculation.Invoke(40, 40);
Console.WriteLine(result);
}
public static void Main232()
{
//Instantiating a delegate
//Using the new keyword
PerformCalculation performCal = new PerformCalculation(Add);
//Using delegate inference
PerformCalculation performCalculation = Add;
SecondDelegate secondDelegate = CountEvenNumbers;
//Invoking a delegate
//Invoking Asynchronously
int[] numArray = { 42, 44, 45, 46, 47, 48, 49, 50 };
secondDelegate.BeginInvoke(numArray, null, null);
//Using the () operator
performCal(40, 45);
//Using the Invoke() method of the delegate class
performCalculation.Invoke(40, 45);
//End on the asynchronous invocation
int sam = secondDelegate.EndInvoke(null);
}
public Testing()
{
CountdownCompleted = null;
OurDelegate = Calculate;
OurDelegate -= Calculate;
OurDelegate += Calculate;
OurDelegate += Calculate;
OurDelegate += Calculate;
OurDelegate += CalculateSum;
OurDelegate = null;
OurDelegate?.Invoke(4, 8);
//CountdownCompleted.Invoke(this, new EventArgs());
// CountdownCompleted = null;
}
static void Main(string[] args)
{
Action <int, int> action = New;
Func <int, int, string> func = Populate;
Predicate <int> predicate = Compare;
//Creates a new PerformCalculation type
PerformCalculation performCalculation = new PerformCalculation(Add);
PerformCalculation perform = Add;
perform += Multiply;
//add method to feedback to user
//add methods to store data in database, send Mail
performCalculation(40, 45);
performCalculation.Invoke(40, 45);
perform.BeginInvoke(40, 45, null, null);
//feedback to the user synchronously
// store data in database, send Mail runs asynchronously on another thread
int sam = perform.EndInvoke(null);
}
public int PerformCalculationMethod(int x, int y)
{
return((PerformCalculationVar?.Invoke(x, y)).GetValueOrDefault());
}
public void Compute(PerformCalculation obj)
{
int result = obj.Invoke(10, 20);
Console.WriteLine(result);
}
public void Hi(PerformCalculation calc)
{
calc.Invoke(1, 5);
}
