static void Generic()
{
GFunc(56);
GDelegate <float> gDelegate = GFunc;
//NOTE this is a delegate type
var tg = gDelegate.GetType();
var closeFunc = gDelegate.Method;
var openFunc = gDelegate.Method.GetGenericMethodDefinition();
Console.WriteLine(closeFunc.IsGenericMethod);
Console.WriteLine(closeFunc.IsGenericMethodDefinition);
var openList = typeof(List <>);
Console.WriteLine(openList.IsGenericType); //NOTE only here can use `<>`
Console.WriteLine(openList.IsGenericTypeDefinition); //NOTE true here
var closeList = typeof(List <long>);
Console.WriteLine(closeList.IsGenericTypeDefinition); //NOTE false here
//open - 还没完全实化
//close - 所有形参都实化了
Console.WriteLine(openList.ContainsGenericParameters); //true
Console.WriteLine(closeList.ContainsGenericParameters); //false
Console.WriteLine(gDelegate.Method.ContainsGenericParameters); //false
//用 MakeGeneric...实化
//取得泛化版本 typeOfList.GetGenericTypeDefinition()
//取得实化泛型的那些 types
var t = closeList.GetGenericArguments(); //NOTE type long here
Console.WriteLine(openFunc.GetGenericArguments()[0].IsGenericParameter); //NOTE True
}
private static void Main(string[] args)
{
Print sth;
int userValue = Convert.ToInt32(Console.ReadLine());
if (userValue % 2 == 0)
{
sth = Printer.PrintEven;
}
else
{
sth = Printer.PrintOdd;
}
sth();
// - - - - - - - - - -
Console.WriteLine();
MathOperations math = new MathOperations();
Operation del = math.Sum;
Console.WriteLine(del(3, 9));
del = math.Multiply;
Console.WriteLine(del(3, 9));
// - - - - - - - - - -
Console.WriteLine();
MyDelegate myDel = ManyMethods.ReturnAsSame;
myDel += ManyMethods.Squaring;
myDel += ManyMethods.MinusOne;
myDel += ManyMethods.Squaring;
myDel += ManyMethods.Squaring;
Console.WriteLine("Return " + myDel(5));
Console.WriteLine(">>> New:");
myDel -= ManyMethods.Squaring;
Console.WriteLine("Return " + myDel(5));
// - - - - - - - - - -
Console.WriteLine();
OtherDelegate firstDelegate = OtherMethods.Greet;
firstDelegate += OtherMethods.HowAreYou;
OtherDelegate secondDelegate = OtherMethods.WhatsUp;
secondDelegate += OtherMethods.Bye;
OtherDelegate generalDelegate = firstDelegate + secondDelegate;
generalDelegate("Mike");
// - - - - - - - - - -
Console.WriteLine();
Invoke_Delegate(sth);
// - - - - - - - - - -
Console.WriteLine();
GDelegate <int> sqDel = Squaring;
Console.WriteLine(sqDel(5));
}
