"C # advanced" Multicast delegates and delegate arrays like it's one thing ~

This mathoperation class has three static methods, the parameters are double, and there is no return value, consider using action<> () This predefined delegate OH

    classmathoperations { Public Static voidMultiplybytwo (Doublevalue) {Console.WriteLine ("0} = {1}", Value,value *2); }         Public Static voidSquare (Doublevalue) {Console.WriteLine ("{0}* {1} = {2}", value, value, value*value); }         Public Static voidIntroduction (Doublevalue) {Console.WriteLine ("I ' m a double. My value is {0}", value); }    }

The book mentions the delegate array , and we define one. Put three methods inside.

            action<double>[] Delegatelist =            {                mathoperations.multiplybytwo,                Mathoperations.square,                mathoperations.introduction            };

I call this delegate this way.

            foreach (var in delegatelist)            {                del (5);            }

Output:

5* 5 = 25
5 = 10
I ' m a double. My value is 5

Try the multicast delegate + number again.

            action<Double> operations = mathoperations.multiplybytwo;             + = Mathoperations.square            ; + = mathoperations.introduction;            Operations (5);

The result is the same.

But the book says it's a good idea.

         Public Static void Processanddisplaynumber (action<doubledouble  value)        {            operations (value);        }

Give a chestnut, hit, relatives, curse, pinch people, these 4 actions all need a person as your object of action. I am an action entrusted <in person, you can let me hit, Curse, Curse * *, all of a sudden to perform a number of actions, including repetitive movements. That's what I understand, at the moment.

"C # advanced" Multicast delegates and delegate arrays like it's one thing ~