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eventHandler.cs #2

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77 changes: 77 additions & 0 deletions eventHandler.cs
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Original file line number Diff line number Diff line change
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using System;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Threading.Tasks;


namespace eventTestClass
{

Class Program
{
Private int nvalue;
Public delegate void valueChangedEventHandler();
Public event valueChangedEventHandler changed;
Protected virtual void onChanged()
{
if (changed != null)
changed();
else
Console.WriteLine("Event fired. No Handler");
}

Public Program (int value)
{
SetValue(nvalue);
}
Public void SetValue(int nv)
{
if (nvalue!=nv)
{
nvalue = nv;
onChanged();
}
}

}
Class Program1
{
Public void HandlerChange1()
{
Console.WriteLine("Handler1");
}
Public void HandlerChange2()
{
Console.WriteLine("Handler2");
}
Public void HandlerChange3()
{
Console.WriteLine("Handler3");
}

Static void Main(string[] args)
{
Program p1 = newProgram(9);
Program1 p2 = newProgram1();
Program1 p3 = newProgram1();
p1.SetValue(10);
p1.changed += newProgram.valueChangedEventHandler(p2.HandlerChange1);
p1.changed += newProgram.valueChangedEventHandler(p2.HandlerChange2);
p1.SetValue(5);
p1.SetValue(5);

p1.changed += newProgram.valueChangedEventHandler(p2.HandlerChange1);
p1.SetValue(5);
p1.changed += newProgram.valueChangedEventHandler(p2.HandlerChange1);
p1.SetValue(44);
p1.SetValue(44);
p1.SetValue(44);
p1.changed += newProgram.valueChangedEventHandler(p3.HandlerChange3);
Console.WriteLine("Enter any key");
Console.ReadKey();

}
}
}