c# - How do I refactor a switch-case using polymorphism? -

from console commands in format [command][position][value] e.g. multiply 2 3 , supposed manipulate array of integers according command. example if have int[] arr = new int[] { 0, 2, 0 }; after executing "multiply 2 3" command array should { 0, 8, 0 }

the way i'm doing giving info method performs manipulation.

static void performaction(int[] arr, string action, int position, int value)     {         switch (action)         {             case "multiply":                 array[position] *= value;                 break;             case "add":                 array[pos] += value;                 break;             case "subtract":                 array[pos] -= value;                 break;         }     } 

my question - how apply polymorphism and/or reflection can say:

executecommand(int[] arr, string action, int position, int value) 

and maybe have class each command, every command knows how executed.

a simple calculator using reflection this

using system.reflection;  namespace stackoverflow35166571 {     public class reflectioncalculator     {         public int calculate(string action, int a, int b)         {             var methodinfo = this.gettype().getmethod(action, bindingflags.instance | bindingflags.nonpublic);             var result = (int)methodinfo.invoke(this, new object[] { a, b });             return result;         }          private int multiply(int a, int b)         {             return * b;         }     } } 

a call like

var calc = new reflectioncalculator(); var result = calc.calculate("multiply", 10, 3); // 30 

a call using inputs like

var calc = new reflectioncalculator(); array[position] = calc.calculate(action, array[position], value);