define class
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public class CarEventArgs : EventArgs { public readonly string msg; public CarEventArgs(string message) { msg = message;} } |
and use it in code…
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Events2 { class Program { static void Main(string[] args) { Car c = new Car(); Car.SomeDelegate d = new Car.SomeDelegate(SomeEvent1Handler); c.SomeEvent1 += d; // added EventHandler c.SomeEvent1 -= d; // removed EventHandler Car.SomeDelegate2 d2 = new Car.SomeDelegate2(SomeEvent2Handler); c.SomeEvent2 += d2; // added EventHandler // c.SomeEvent2 -= d2; // removed EventHandler //c.SomeEvent1 += new Car.SomeDelegate(SomeEvent1Handler); // another way to assign Event handler //c.SomeEvent2 += new Car.SomeDelegate2(SomeEvent2Handler); c.SomeMethod(); Console.ReadLine(); } public static void SomeEvent1Handler(string msg) { Console.WriteLine("SomeEvent1Handler " + msg); } public static void SomeEvent2Handler(object sender, CarEventArgs e) { if (sender is Car) { Car c = (Car)sender; Console.WriteLine("{0} says {1} ",sender, e.msg); } } } public class Car { public delegate void SomeDelegate(string msg); public delegate void SomeDelegate2(object sender, CarEventArgs e); public event SomeDelegate SomeEvent1; public event SomeDelegate2 SomeEvent2; public void SomeMethod() { //some code if (SomeEvent1 != null) SomeEvent1("someMessage"); // fire Event Handler //some code if (SomeEvent2 != null) SomeEvent2(this, new CarEventArgs("someMessage2")); // fire Event Handler } } public class CarEventArgs : EventArgs { public readonly string msg; public CarEventArgs(string message) { msg = message;} } } |