static void Main(string[] args)
{
//Ejemplo de constructor estático
//Cuando ejecuto esta línea, se llama sólo al constructor estático y puedo acceder a las propiedades estáticas que éste inicializa
System.Console.WriteLine("The background color is {0}", UserPreferences.BackgroundColor.Name);
//Cuando creo una instancia usando el constructor no estático, se invoca ese constructor, y, en caso de que esta sea la primera carga de la clase
//se llama antes al constructor estático
UserPreferences ThisUserPreferences = new UserPreferences();
//En este punto ya las propiedades estáticas están inicializadas
ThisUserPreferences.PrintColor();
//En este ejemplo veo que es lo mismo usar la propiedad estática Instance
//que asignar una variable de tipo adecuado a la propiedad instance. Ambas referencias apuntan al mismo objeto
System.Console.WriteLine("En la linea que sigue hago una declaración");
SingletonClass unSingleton;
System.Console.WriteLine("En la linea que sigue asigno instance a la variable declarada más arriba");
unSingleton = SingletonClass.Instance;
System.Console.WriteLine("Hecha la asignación");
unSingleton.DoSomethingAlready();
SingletonClass.Instance.DoSomethingAlready();
//Ahora viene el código para los WeakEvents
//Uso los mismos nombres que usé antes para poder comparar más fácilmente
var deAutos = new CarDealer("deAutos.com");
var carlos = new Subscriber("Ricky Fort");
NewCarWeakEventManager.AddListener(deAutos, carlos);
//Antes era: deAutos.NewCarEvent += carlos.NewCarEventListener;
//En la sig. línea no se invoca al evento directamente,
//Se invoca un método que genera el evento. Esto quedó como antes
deAutos.NewCar("Toyota Celica");
var roberto = new Subscriber("Roberto Planta");
NewCarWeakEventManager.AddListener(deAutos, roberto);
//Antes era: deAutos.NewCarEvent += roberto.NewCarEventListener;
deAutos.NewCar("Lumina");
//Ahora quito un suscriptor
NewCarWeakEventManager.RemoveListener(deAutos, roberto);
//Antes era: deAutos.NewCarEvent -= roberto.NewCarEventListener;
deAutos.NewCar("Rolls Royce");
}
static void Main(string[] args)
{
var newCarDealer = new CarDealer();
var valtteri = new Consumer("Valtteri");
newCarDealer.NewCarInfo += valtteri.NewCarIsHere;
newCarDealer.NewCar("Williams");
var max = new Consumer("Max");
newCarDealer.NewCarInfo += max.NewCarIsHere;
newCarDealer.NewCar("Mercedes");
newCarDealer.NewCarInfo -= valtteri.NewCarIsHere;
newCarDealer.NewCar("Ferrari");
}
public static void main()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
dealer.NewCarInfo += michael.NewCarIsHere;
dealer.NewCar("Ferrari");
var sebastian = new Consumer("Sebastian");
dealer.NewCarInfo += sebastian.NewCarIsHere;
dealer.NewCar("Mercedes");
dealer.NewCarInfo -= michael.NewCarIsHere;
dealer.NewCar("Red Bull Racing");
}
public void TestWeakEvents()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
WeakCarInfoEventManager.AddListener(dealer, michael);
dealer.NewCar("Mercedes");
var sebastian = new Consumer("Sebastian");
WeakCarInfoEventManager.AddListener(dealer, sebastian);
dealer.NewCar("Ferrari");
WeakCarInfoEventManager.RemoveListener(dealer, michael);
dealer.NewCar("Red Bull Racing");
}
public static void Main()
{
// Create dealer and customer
var dealer = new CarDealer();
var michael = new Consumer("Michael");
// attach a listener to and event - use the += notation
dealer.NewCarEvent += michael.NewCarIsHere;
dealer.NewCar("Ferrari");
dealer.NewCarEvent -= michael.NewCarIsHere;
var nick = new Consumer("Sebastian");
dealer.NewCarEvent += nick.NewCarIsHere;
dealer.NewCar("Mercedes");
dealer.NewCarEvent -= nick.NewCarIsHere;
dealer.NewCar("Red Bull Racing");
}
static void Main()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
dealer.NewCarInfo += michael.NewCarIsHere;
dealer.NewCar("Mercedes");
var nick = new Consumer("Nick");
dealer.NewCarInfo += nick.NewCarIsHere;
dealer.NewCar("Ferrari");
dealer.NewCarInfo -= michael.NewCarIsHere;
dealer.NewCar("Toyota");
}
static void Main()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
WeakCarInfoEventManager.AddListener(dealer, michael);
dealer.NewCar("Mercedes");
var nick = new Consumer("Nick");
WeakCarInfoEventManager.AddListener(dealer, nick);
dealer.NewCar("Ferrari");
WeakCarInfoEventManager.RemoveListener(dealer, michael);
dealer.NewCar("Toyota");
}
static void Main()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
WeakCarInfoEventManager.AddListener(dealer, michael);
dealer.NewCar("Mercedes");
var sebastian = new Consumer("Sebastian");
WeakCarInfoEventManager.AddListener(dealer, sebastian);
dealer.NewCar("Ferrari");
WeakCarInfoEventManager.RemoveListener(dealer, michael);
dealer.NewCar("Red Bull Racing");
}
static void Main()
{
var dealer = new CarDealer();
var daniel = new Consumer("Daniel");
dealer.NewCarInfo += daniel.NewCarIsHere;
dealer.NewCar("Mercedes");
var sebastian = new Consumer("Sebastian");
dealer.NewCarInfo += sebastian.NewCarIsHere;
dealer.NewCar("Ferrari");
dealer.NewCarInfo -= sebastian.NewCarIsHere;
dealer.NewCar("Red Bull Racing");
}
static void Main06()
{
var dealer = new CarDealer();
var michael = new Consumer("Micheal");
dealer.NewCarInfo += michael.NewCarIsHere;
dealer.NewCar("Mercedes");
var nick = new Consumer("Nick");
dealer.NewCarInfo += nick.NewCarIsHere;
dealer.NewCar("Ferrari");
dealer.NewCarInfo -= michael.NewCarIsHere;
dealer.NewCar("Toyota");
}
static void Main()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
WeakCarInfoEventManager.AddListener(dealer, michael);
dealer.NewCar("Mercedes");
var nick = new Consumer("Nick");
WeakCarInfoEventManager.AddListener(dealer, nick);
dealer.NewCar("Ferrari");
WeakCarInfoEventManager.RemoveListener(dealer, michael);
dealer.NewCar("Toyota");
}
static void Main()
{
var dealer = new CarDealer();
var daniel = new Consumer("Daniel");
dealer.NewCarInfo += daniel.NewCarIsHere;
dealer.NewCar("Mercedes");
var sebastian = new Consumer("Sebastian");
dealer.NewCarInfo += sebastian.NewCarIsHere;
dealer.NewCar("Ferrari");
dealer.NewCarInfo -= sebastian.NewCarIsHere;
dealer.NewCar("Red Bull Racing");
}
static void Main()
{
var dealer = new CarDealer();
var micheal = new Consumer("micheal");
dealer.NewCarInfo += micheal.NewcarIsHere;
dealer.NewCar("Ferrari");
//var sebastian = new Consumer("sebastian");
//dealer.NewCarInfo += sebastian.NewcarIsHere;
//dealer.NewCar("Mercedes");
//dealer.NewCarInfo += sebastian.NewcarIsHere;
//dealer.NewCarInfo -= micheal.NewcarIsHere;
//dealer.NewCar("Red Bull Racing");
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
// 弱事件示例
private static void WeakEvent()
{
var dealer = new CarDealer();
var michael = new Consumer("Michael");
WeakCarInfoEventManager.AddListener(dealer, michael);
dealer.NewCar("Mercedes");
Console.ReadKey();
}
static void Main(string[] args)
{
//int x = 40;
//GetAString firstStringMethod=new GetAString(x.ToString);
//Console.WriteLine($"String is {firstStringMethod}");
//int x = 40;
//GetAString firstStringMethod = x.ToString;
//Console.WriteLine($"{firstStringMethod}");
//var balance=new Currency(34,50);
//firstStringMethod = balance.ToString;
//Console.WriteLine($"{firstStringMethod}");
//firstStringMethod=new GetAString(Currency.GetCurrencyUnit);
//Console.WriteLine($"{firstStringMethod}");
//DoubleOp[] operations =
//{
// MathOperations.MultiplyByTwo,
// MathOperations.Square
//};
//for (int i = 0; i < operations.Length; i++)
//{
// Console.WriteLine($"Using operations[{i}]");
// ProcessAndDisplayNumber(operations[i], 2.0);
// ProcessAndDisplayNumber(operations[i], 7.94);
// ProcessAndDisplayNumber(operations[i],1.414);
// Console.WriteLine();
//}
//Employee[] employees =
//{
// new Employee("a", 20000),
// new Employee("b",20000),
// new Employee("c",20000),
// new Employee("d",20000),
// new Employee("e",20000),
//};
//BubbleSorter.Sort(employees,Employee.CompareSalary);
//foreach (var employee in employees) {
// Console.WriteLine(employee);
//}
//Action<double> operation = MathOperations.MultiplyByTwo;
//operation += MathOperations.Square;
//ProcessAndDisplayNumber(operation,2.0);
//ProcessAndDisplayNumber(operation, 7.94);
//ProcessAndDisplayNumber(operation, 1.414);
//Console.WriteLine(1);
Action d1 = One;
d1 += Two;
try
{
d1();
}
catch (Exception e)
{
Console.WriteLine("Exception caught1");
}
string mid = ",middle part,";
Func <string, string> lambda = param =>
{
param += mid;
param += " amd this was added to the string";
return(param);
};
Console.WriteLine(lambda("Start of string"));
var dealer = new CarDealer();
var valtteri = new Consumer("Valtteri");
dealer.NewCarInfo += valtteri.NewCarIsHere;
dealer.NewCar("Williams");
var max = new Consumer("Max");
dealer.NewCarInfo += max.NewCarIsHere;
dealer.NewCar("Mercedes");
dealer.NewCarInfo -= valtteri.NewCarIsHere;
dealer.NewCar("Ferrari");
}
static void Main(string[] args)
{
int x = 40;
GetAString firstStringMethod = x.ToString;
Console.WriteLine($"String is {firstStringMethod()}");
var balance = new Currency(34, 50);
firstStringMethod = balance.ToString;
Console.WriteLine($"String is {firstStringMethod()}");
firstStringMethod = new GetAString(Currency.GetCurrencyUnit);
Console.WriteLine($"String is {firstStringMethod()}");
Console.WriteLine($"------------------");
DoubleOp[] operations =
{
MathOperations.MultiplayByTwo,
MathOperations.Square
};
//声明参数类型是double,返回类型是double的Func委托，
//对于Func<a,b>, b类型是返回类型，a类型是输入参数类型，输入参数类型可以有多个
//例如Func<a,a,c,b>，表示3个参数，分别是a类型，a类型，c类型,返回值是b类型
Func <double, double>[] funcOperations =
{
MathOperations.MultiplayByTwo,
MathOperations.Square
};
for (int i = 0; i < operations.Length; i++)
{
Console.WriteLine($"Using operation[{i}]");
ProcessAndDisplayNumber(operations[i], 2.0);
ProcessAndDisplayNumber(operations[i], 7.94);
ProcessAndDisplayNumber(operations[i], 1.414);
}
for (int i = 0; i < funcOperations.Length; i++)
{
Console.WriteLine($"Using operation[{i}]");
ProcessFuncAndDisplayNumber(funcOperations[i], 2.0);
ProcessFuncAndDisplayNumber(funcOperations[i], 7.94);
ProcessFuncAndDisplayNumber(funcOperations[i], 1.414);
}
Console.WriteLine($"------------------");
Employee[] employees =
{
new Employee("Tom", 20000),
new Employee("Jack", 10000),
new Employee("Bob", 15000),
new Employee("Roy", 100000.38m),
new Employee("Lily", 23000),
new Employee("Jean", 50000),
};
//将Employee.CompareSalary方法作为委托参数传入BubbleSorter.Sort方法
BubbleSorter.Sort(employees, Employee.CompareSalary);
foreach (var item in employees)
{
Console.WriteLine(item);
}
Console.WriteLine($"------------------");
//多播委托，一个委托可以包含多个方法，但是委托签名必须返回void，否则只能得到委托调用最后一个方法的结果
Action <double> actionOperations = MathOperations.ActionMultiplayByTwo;
actionOperations += MathOperations.ActionSquare;
ProcesActionAndDisplayNumber(actionOperations, 2.0);
ProcesActionAndDisplayNumber(actionOperations, 7.94);
ProcesActionAndDisplayNumber(actionOperations, 1.414);
Console.WriteLine($"------------------");
string mid = ", middle part,";
//匿名方法
// Func<string, string> anonDel = delegate(string param)
// {
// param += mid;
// param += " and this was added to the string";
// return param;
//};
//使用lambda表达式的匿名方法，参数的类型和委托定义的类型对照
Func <string, string> anonDel = param =>
{
param += mid;
param += " and this was added to the string";
return(param);
};
Console.WriteLine(anonDel("Start of string"));
Console.WriteLine($"------------------");
var dealer = new CarDealer();
var valtteri = new Consumer("Valtteri");
dealer.NewCarInfo += valtteri.NewCarIsHere;
dealer.NewCar("Williams");
var max = new Consumer("Max");
dealer.NewCarInfo += max.NewCarIsHere;
dealer.NewCar("Mercedes");
dealer.NewCarInfo -= valtteri.NewCarIsHere;
dealer.NewCar("Ferrari");
}