static int SumWithFunc(int[] elements, FunctionTakingOneIntAndReturningAnInt f)
{
int sum = 0;
foreach (var i in elements)
{
sum += f(i);
}
return(sum);
}
static void Main1(string[] args)
{
#region Delegate Definition
ProcessSingleString printingUsingPrintString = PrintString;
printingUsingPrintString("Hello World explicit");
ProcessSingleString printByDelegateInstantiation = delegate(string s) { Console.WriteLine(s); };
printByDelegateInstantiation("Hello World Delegate Instantiation");
#endregion
#region use of delegates
int[] arr = new int[] { 11, 12, 13, 14 };
Debug.WriteLine("Sum of arr square = " + SumWithFunc(arr, Square));
Debug.WriteLine("Sum of arr unit positions = " + SumWithFunc(arr, UnitPos));
#endregion
#region AnonFunc
ProcessSingleString printingUsingAnonymous = (s) => { Console.WriteLine(s); };
printingUsingAnonymous("Hello World Anon");
//expression vs code block
FunctionTakingOneIntAndReturningAnInt unitPosAnon = (x) => { return(x % 10); };
FunctionTakingOneIntAndReturningAnInt squareAnon = (x) => (x * x);
#endregion
#region Func and Action
Func <int, int> squareFunc = (x) => (x * x);
Func <int, int, int> add = (a, b) => (a + b);
Action <string> printAction = (x) => { Debug.WriteLine(x); };
printAction("Hello world action");
#endregion
seqSum(students, (x) => x.ChemistryMarks);
}
