static void Main(string[] args)
{
var del1 = new CovariantDelegate <MyParentType>(MyStaticMethodWithReturnParentType);
var del2 = new CovariantDelegate <MyParentType>(MyStaticMethodWithReturnChildType);
// Error
//var del3 = new CovariantDelegate<MyChildType>(MyStaticMethodWithReturnParentType);
var del4 = new CovariantDelegate <MyChildType>(MyStaticMethodWithReturnChildType);
var del5 = new ContravariantDelegate <MyParentType>(MyStaticMethodWithInParentType);
// Error
//var del6 = new ContravariantDelegate<MyParentType>(MyStaticMethodWithInChildType);
var del7 = new ContravariantDelegate <MyChildType>(MyStaticMethodWithInParentType);
var del8 = new ContravariantDelegate <MyChildType>(MyStaticMethodWithInChildType);
del1();
del2.Invoke();
del4();
del5(new MyParentType());
del7(new MyChildType());
del8(new MyChildType());
var myType = new MyType();
var del9 = new CovariantDelegate <MyParentType>(myType.MyMethodWithReturnParentType);
var del10 = new CovariantDelegate <MyParentType>(myType.MyMethodWithReturnChildType);
del9();
del10();
Console.ReadLine();
}
static void Main(string[] args)
{
#region 泛型调用
//泛型委托
InputGenericsDelegate <int> inputGenericsDelegate = (p) => { Console.WriteLine("泛型委托"); };
//泛型类
MyGenerics <string> myGenerics = new MyGenerics <string>();
//泛型方法
myGenerics.GenericsMethod <string>("泛型方法");
myGenerics.GenericsMethod <string, int>("泛型方法");
#endregion
#region 泛型可变性
//协变
CovariantDelegate <string> covariantDelegateStr = () => { return("协变泛型委托"); };
CovariantDelegate <object> covariantDelegate = covariantDelegateStr;
//逆变
ContravariantDelegate <object> contravariantDelegateObj = (p) => { Console.WriteLine("逆变泛型委托"); };
ContravariantDelegate <string> contravariantDelegate = contravariantDelegateObj;
#endregion
Console.ReadKey();
}
static void Main1(string[] args)
{
Planet p = new Planet();
Earth e = new Earth();
CovariantDelegate varCovariantDelegate = new CovariantDelegate(p.CallingPlanet);
varCovariantDelegate();
varCovariantDelegate = new CovariantDelegate(e.CallingEarth);
varCovariantDelegate();
ContravariantDelegate varContravariantDelegate = new ContravariantDelegate(PlanetParamMethod);
varContravariantDelegate(e);
varContravariantDelegate = new ContravariantDelegate(EarthParamMethod);
varContravariantDelegate(e);
}
