// for:

// https://stackoverflow.com/questions/50989740/casting-object-to-type-into-variable-of-said-type-known-only-at-runtime

​

    using System;

    public class Program

    {

        public static void Main()

        {       

            var p = new Program();

            object s = "Hi";

            object i = 42;

            object f = 3.14;

            p.Test(s);

            p.Test(i);

            p.Test(f);

            p.SetTestType(GetConfigType());

            p.ConfiguredTest("Hello");

            p.ConfiguredTest(s);

        }

        public static Type GetConfigType() { return typeof(string); }

        Action<object> ConfiguredTest;

        void SetTestType(Type type)

        {

            if (type == typeof(string))

                ConfiguredTest = o => Test((string)o);

            else if (type == typeof(int))

                ConfiguredTest = o => Test((int)o);

            else

                ConfiguredTest = null;

        }

        void Test(object o) // catch-all when type is not known until runtime

        {

            if (ConfiguredTest != null)

            {

                ConfiguredTest(o); // if type is configured, we can skip type checking

            }

            else // if type is not configured, check for supported types

            {

                if (o is string)

                    Test((string)o);

                else if (o is int)

                    Test((int)o);

                else

                    Console.WriteLine("Unsupported type: " + o.GetType());

            }

        }

        void Test(int i) { Console.WriteLine("Int = " + i); }

        void Test(String s) { Console.WriteLine("String = " + s); }

    }