//两者传的参数一定要一样，才可以用delegate 来调用另外的methods;
//reference them, assign the veriable
//allow us to methods another ,can referrence anther methods ,passerd anther methods to ,
//将一个方法传到另一个方法，将方法作为参数或者变量在另一个方法中
public void OnEnable()
{
//MeDelegate meDelegate = new MeDelegate(Foo);
//meDelegate.Invoke();
//meDelegate();
//MeDelegate meDelegate1 = Goo;
//// if we write this ,the compiler will replace this with an invoke call
////we not invoke foo here ,we're just passing it..
////this is shorthans sugar
//meDelegate1();
//// when this is compiles ,we will get a new medelegate.,and it's invoke method will be calles
////with delegates ,we are able to treat methods like first class objects
///
MedelegateTakeIntReturnBool medel = FooTakeInt;
////the same reason we parameterize this ,is why we parameterize code ,or reference to code (_methods /functions)
//var resultlessthanfive = GetallthenumbersLessThanFive(new List<int>() { 1, 2, 10, 58, 56, 204, });
//foreach(var number in resultlessthanfive)
//{
//}
////list 后方可以在定义一个变量，来数出其中的数字
//var resultlessthanTen = GetallthenumbersLessThanTen(new List<int>() { 20, 25, 10, 58, 56, 204, });
//foreach (var number in resultlessthanTen)
//{
//}
var numbers = new List <int> {
2, 30, 45, 62, 10, 12
};
var numbersLessThanFive = RunNumbersThroughTheGauntlet(numbers, lessThanFive);
MedelegatelessthanFive minigauntlet = lessThanFive;
//this is great but we still have to deal with making these methods
//Lambads =>
// var resultlessThanFive = RunNumbersThroughTheGauntlet(numbers, n => n < 5);
var resultlessThanFive = numbers.Where(n => n < 5);
//only have what we need
//take the lambads if i create a lamba when i compile the programm it can automaticaly creat a methods for you;
//add delegating and moving delegating
//WE know we can assign delegate and create new objects/targets like this
//MeDelegate meDelegate = MOO;
//meDelegate = (MeDelegate)Delegate.Combine(meDelegate, (MeDelegate)BOO);
//meDelegate = meDelegate + BOO;
//meDelegate.Invoke();
//meDelegate -= BOO;
//their are no targets for moo and sue,since they are static methods ,and are callled by themself;
//foreach(var DEL in meDelegate.GetInvocationList())
//{
// Debug.Log("");
//}
//what will get return;
//only get the last value
MeDelegateReturnInt meDelRetInt = ReturnFive;
meDelRetInt += ReturnTen;
var value = meDelRetInt();
Debug.Log(value);
foreach (var del in meDelRetInt.GetInvocationList())
{
Debug.Log(del.DynamicInvoke());
}
//we can also generify our delegate
MeDelegateGeneric <int> meDelegate = ReturnFive;
meDelegate += ReturnTen;
//usually ,just like with generics ,we don't have to creat our own delegates, because we have actions and func
//func have a return
//Func<int> meFunc = ReturnFive;
//meFunc += ReturnTen;
//foreach(var f in meFunc.GetInvocationList())
//{
// Debug.Log(f.DynamicInvoke());
//}
//actions have no return (return void)
Action <int> meAct = TakeAnIntReturnVoid;
//Action returnNothing = nothing;
meAct(15);
//big diffient between is act return nothing;
//the difference between delegates and events...
//an event is a delegates,with two restrictions, you can't assign them directly ,and you can't invoke them directly
//myaction = ReturnTen;
}
public void OnEnable()
{
#region Delegates
////We're not invoking Foo here, we're just passing it...
////MeDelegate meDelegate = Foo;
//MeDelegate meDelegate = new MeDelegate(Foo);
//Dele1 dele1 = new Dele1(FooReturnInt);
////This is a reference to a class, but it's also treated like a METHOD
//meDelegate.Invoke();
//MeDelegate meDelegate2 = Goo;
//Dele2 dele2 = FooTakeInt;
////If we write this, the compiler will replace this with an INVOKE call
////This is shorthand/syntactic sugar
//meDelegate2();
//dele1();
//dele2(1);
////When this is compiled, we'll get a new MeDelegate, and it's invoke method will be called
////With delegates, we are able to treat methods like first class objects,表示可以把方法当成一个类来使用，所以可以将参数设为一个方法
//InvokeTheDelegate(Foo);
////Delegates are references to objects AND methods
//Debug.Log($"Target:{meDelegate.Target},Method:{meDelegate.Method}");
////因为Goo是static方法，所以它没有target，而Foo是静态方法，所以它
//Debug.Log($"Target:{meDelegate2.Target},Method:{meDelegate2.Method}");
//MeDelegateTakeIntReturnBool medel = FooTakeIntReturnBool;
//medel(5);
////The same reason we parameterize this, is why we parameterize code, or references to code (methods/functions)
//var result = GetAllTheNumberLessThanFive(new List<int>() {1, 25, 4, 765, 4});
//foreach (var number in result)
//{
// Debug.Log(number);
//}
//var numbers = new List<int>() {1, 25, 3, 6, 2, 7, 19, 3, 2};
//var numbersLessThanFive = RunNumbersThroughTheGauntLet(numbers, LessThanFive);
//var numbersLessThanTen = RunNumbersThroughTheGauntLet(numbers, LessThanTen);
//var numbersLessThanTwenty = RunNumbersThroughTheGauntLet(numbers, GreaterThanTwenty);
////use lambda "=>" to simplize our delegate.(syntactic sugar)
////Because delegate has already had the struct.
////"=>" means ((parameter) => (return))
//var numbersLessThanTwo = RunNumbersThroughTheGauntLet(numbers, i => i < 2);
//Delegate Chaining
//Adding and removing delegates...
MeDelegate meDelegate = Moo;
meDelegate = (MeDelegate)Delegate.Combine(meDelegate, (MeDelegate)Boo);
meDelegate = meDelegate + Sue;
meDelegate += Moo;
meDelegate -= Moo;//The Result will be"Moo,Boo,Sue".The last one "Moo" will be removed;
meDelegate.Invoke();
foreach (var del in meDelegate.GetInvocationList())
{
Debug.Log($"Target:{del.Target}, Method:{del.Method}");
}
//What will get returned?
MeDelegateReturnInt meDelRetInt = ReturnFive;
meDelRetInt += ReturnTen;
var value = meDelRetInt();
Debug.Log(value);//The Result is 10.I will get the last value.
foreach (var del in meDelRetInt.GetInvocationList())
{
Debug.Log(del.DynamicInvoke());
}//The Result is 5 and then 10. we will get 2 value;
//Generic Delegate
MeDelegateGeneric <int> delegateGeneric = () => 5;
delegateGeneric += () => 10;
MeDelegateGeneric <string> meDelegateString = () => "Jeff";
meDelegateString += (() => "Chris");
//Usually, just like with generics, we don't have to create our own delegates
//Because Actions and Funcs
//Funcs have a return
Func <int> meFunc = () => 5;//Func|Return~~~Fountain
meFunc += () => 10;
foreach (var f in meFunc.GetInvocationList())
{
Debug.Log(f.DynamicInvoke());
}
Func <int, int, string> meFunc2 = (i, i1) => ("me");
//The last one is return
//Action return void ,just parameter
//Because 'Action' means do something. So Action have no return, just doing things in the method
Action <int> meAct = TakeAnIntReturnVoid;
#endregion
#region Events
//The difference between delegates, and events...
//!!!An event is a delegate, with TWO restrictions: you can't assign them directly, and you can't invoke them directly
TrainSignal.TrainsCOMING += ATrainsComing;
#endregion
}