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();
}
public void Test1()
{
MyGenerics g = new MyGenerics();
int x = 5, y = 4;
g.GetSum <int>(ref x, ref y);
string strX = "5", strY = "4";
g.GetSum(ref strX, ref strY);
// Use the generic struct
Rectangle <int> rec1 = new Rectangle <int>(20, 50);
Console.WriteLine(rec1.GetArea());
Rectangle <string> rec2 = new Rectangle <string>("20", "50");
Console.WriteLine(rec2.GetArea());
// Delegates allow you to reference methods
// inside a delegate object. The delegate
// object can then be passed to other
// methods that can call the methods assigned
// to the delegate. It can also stack methods
// that are called in the specified order
// Create delegate objects
Arithmetic add, sub, addSub;
// Assign just the Add method
add = new Arithmetic(Add);
// Assign just the Subtract method
sub = new Arithmetic(Subtract);
// Assign Add and Sub
addSub = add + sub;
// You could also subtract a method
// sub = addSub - add;
// Print out results
Console.WriteLine($"Add {6} & {10}");
add(6, 10);
// Call both methods
Console.WriteLine($"Add & Subtract {10} & {4}");
addSub(10, 4);
Console.ReadLine();
}
