《C#進階編程》委託、事件的範例程式碼

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運行結果：

 

Program.cs

 1 using System; 2  3 namespace Wrox.ProCSharp.Delegates 4 { 5     class Program 6     { 7         static void Main() 8         { 9             var dealer = new CarDealer();10 11             var michael = new Consumer("Michael");12             dealer.NewCarInfo += michael.NewCarIsHere;13 14             dealer.NewCar("Mercedes");15 16             var nick = new Consumer("Nick");17             dealer.NewCarInfo += nick.NewCarIsHere;18 19             dealer.NewCar("Ferrari");20 21             dealer.NewCarInfo -= michael.NewCarIsHere;22 23             dealer.NewCar("Toyota");24 25             Console.Read();26         }27     }28 }

 

CarDealer.cs

 1 using System; 2  3 namespace Wrox.ProCSharp.Delegates 4 { 5     public class CarInfoEventArgs : EventArgs 6     { 7         public CarInfoEventArgs(string car) 8         { 9             this.Car = car;10         }11 12         public string Car { get; private set; }13     }14 15     public class CarDealer16     {17         public event EventHandler<CarInfoEventArgs> NewCarInfo;18 19         public void NewCar(string car)20         {21             Console.WriteLine("CarDealer, new car {0}", car);22             if (NewCarInfo != null)23             {24                 NewCarInfo(this, new CarInfoEventArgs(car));25             }26         }27     }28 }

 

Consumer.cs

 1 using System; 2  3 namespace Wrox.ProCSharp.Delegates 4 { 5     public class Consumer 6     { 7         private string name; 8  9         public Consumer(string name)10         {11             this.name = name;12         }13 14         public void NewCarIsHere(object sender, CarInfoEventArgs e)15         {16             Console.WriteLine("{0}: car {1} is new", name, e.Car);17         }18     }19 }