C# delegate multicast single delegate

using system;
using system.collections.generic;
using system.linq;
using system.runtime.serialization;
using system.text;
using system.threading.tasks;

namespace consoleapp386
{
    class program
    {
        static void main(string[] args)
        {
            thermostat thermostat = new thermostat();
            heater heater = new heater(60);
            cooler cooler = new cooler(80);
            
            action<float> del1;
            action<float> del2;
            action<float> del3;
            del1 = heater.ontemperaturechanged;
            del2 = cooler.ontemperaturechanged;
            console.writeline("invoke both delegates:");
            del3 = del1+del2;
             
            del3(90);
            console.writeline("multicast delegates:");
            foreach(var dl in del3.getinvocationlist())
            {
                console.writeline($"target:{dl.target},method:{dl.method}"); 
            }

           
            console.writeline();
            console.writeline("invoke only del2:");
            del3 = del3 - del1;
            del3(30);

            console.writeline("\nsingle delegate:");
            foreach (var dl in del3.getinvocationlist())
            {
                console.writeline($"target:{dl.target},method:{dl.method}");
            }

            console.readline();
        }
    }

    class cooler
    {         
        public float temperature
        {
            get;set;
        }
        public cooler(float temperature)
        {
            temperature = temperature;
        }

        public void ontemperaturechanged(float newtemperature)
        {
            if(newtemperature>temperature)
            {
                console.writeline("cooloer:on");
            }
            else
            {
                console.writeline("cooler:off");
            }
        }         
    }

    class heater
    {        
        public float temperature
        {
            get;set;
        }
        public heater(float temperature)
        {
            temperature = temperature;
        }

        public void ontemperaturechanged(float newtemperature)
        {
            if(newtemperature<temperature)
            {
                console.writeline("heater:on");
            }
            else
            {
                console.writeline("heater:off");
            }
        }
    }

    public class thermostat
    {
        //define the event publisher
        public action<float> ontemperaturechange { get; set; }

        private float currenttemperaturevalue;
        public float currenttemperature
        {
            get
            {
                return currenttemperaturevalue;
            }
            set
            {
                if(value!=currenttemperaturevalue)
                {
                    currenttemperaturevalue = value;
                    ontemperaturechange?.invoke(value);
                }
            }
        }
    }
}

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;

namespace consoleapp386
{
    class program
    {
        static void main(string[] args)
        {
            thermostat thermostat = new thermostat();
            heater heater = new heater(60);
            cooler cooler = new cooler(80);
            
            action<float> del1;
            action<float> del2;
            action<float> del3;
            del1 = heater.ontemperaturechanged;
            del2 = cooler.ontemperaturechanged;
            console.writeline("invoke both delegates:");
            del3 = del1;
            del3 += del2;
            del3(90);
            console.writeline("multicast delegates:");
            foreach(var dl in del3.getinvocationlist())
            {
                console.writeline($"target:{dl.target},method:{dl.method}"); 
            }
            console.writeline();
            console.writeline("invoke only del2:");
            del3 -= del1;
            del3(30);

            console.writeline("\nsingle delegate:");
            foreach (var dl in del3.getinvocationlist())
            {
                console.writeline($"target:{dl.target},method:{dl.method}");
            }
            console.readline();
        }
    }

    class cooler
    {         
        public float temperature
        {
            get;set;
        }
        public cooler(float temperature)
        {
            temperature = temperature;
        }

        public void ontemperaturechanged(float newtemperature)
        {
            if(newtemperature>temperature)
            {
                console.writeline("cooloer:on");
            }
            else
            {
                console.writeline("cooler:off");
            }
        }         
    }

    class heater
    {        
        public float temperature
        {
            get;set;
        }
        public heater(float temperature)
        {
            temperature = temperature;
        }

        public void ontemperaturechanged(float newtemperature)
        {
            if(newtemperature<temperature)
            {
                console.writeline("heater:on");
            }
            else
            {
                console.writeline("heater:off");
            }
        }
    }

    public class thermostat
    {
        //define the event publisher
        public action<float> ontemperaturechange { get; set; }

        private float currenttemperaturevalue;
        public float currenttemperature
        {
            get
            {
                return currenttemperaturevalue;
            }
            set
            {
                if(value!=currenttemperaturevalue)
                {
                    currenttemperaturevalue = value;
                    ontemperaturechange?.invoke(value);
                }
            }
        }
    }
}