// This below is a custom delegate
// Creating a delegate, which will hold the pointer address
// of all the methods that we wish to call.
// public delegate void PhotoFilterHander(Photo photo);
// Below we pass the delegate into our method as a param.
public void Process(Photo photo, Action <Photo> photoFilterHander)
{
var filter = new PhotoFilter();
photoFilterHander(photo); // Call the delegate with the photo.
// Above the delegate is now incharge of handling all the photo filters to be applied.
}
private static void Main(string[] args)
{
var photoProcessor = new PhotoProcessor();
var filter = new PhotoFilter();
Action <Photo> filterHandler = filter.ApplyBrightness;
//PhotoProcessor.PhotoFilterHandler filterHandler = filter.ApplyBrightness;
filterHandler += filter.ApplyContrast;
filterHandler += RemoveRedEye;
photoProcessor.Processor("ABC", filterHandler);
}
public static void Main(string[] args)
{
// A new photo
var photo = new Photo();
// A photo filter to apply
var filters = new PhotoFilter();
// Create an instance of our photo processor class
var processor = new PhotoProcessor();
// A new delegate
Action <Photo> handler = filters.GreyScale;
// Add another filter into our process
handler += filters.AutoFilter;
// Adding our new red eye reduction filter
handler += ApplyRedEyeReduction; // Note the lack of Filters. prefix
processor.Process(photo, handler);
}
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
//Old way
var del = new MyDelegate(CircleArea);
var area = del(5);
//Using Anonymous method and lambda expression
MyDelegate del2 = r => 3.14 * r * r;
var area2 = del2(4);
//Using Func since parameter and return value is present
Func <double, double> del3 = r => 3.14 * r * r;
var area3 = del3(4);
//Action used when there is no return type
Action <string> del4 = x => Console.WriteLine(x);
//Predicate is used for checking purpose
Predicate <string> checkLengthGreaterThan5 = x => x.Length > 5;
var isle = checkLengthGreaterThan5("Ashin");
ClientClass1 clientClass1 = new ClientClass1();
clientClass1.CallProcess();
#region PhotoProcessing example
var photoProcessor = new PhotoProcessor();
var photoFilter = new PhotoFilter();
Action <Photo> handler = photoFilter.ApplyBlackAndWhite;
handler += photoFilter.ApplyForestFilter;
photoProcessor.Process("url", handler);
Console.ReadLine();
#endregion
}
