在.NET中傳遞事件

Question

我很抱歉發佈了這麼大的一段代碼，但在這種情況下，我覺得這會更容易理解這個問題，儘管問題可能很簡單（同樣簡單的答案我希望）。

我正在玩事件和代表。在我的Main方法中，我的代碼是

traffic.PutInGarage(g); 

這意味着我傳遞了我的Garage類的引用（請參閱下面的代碼）。這是你期望事件通過的方式嗎？我不明白爲什麼，我無法解釋爲什麼，感覺不對，就像我錯過了某些地方的觀點。

再次，抱歉發佈所有控制檯應用程序代碼，但它可能更容易。

using System; 
using System.Collections.Generic; 

namespace DemoProejct 
{ 
    public class Program 
    { 
     public static void Main(string[] args) 
     { 
      Garage g = new Garage(); 
      g.NewCarEvent += new Garage.NewCarDelegate(GarageCount); 

      Traffic traffic = new Traffic(); 

      //SHOULD I BE PASSING THE Garage object here? 

      traffic.PutInGarage(g); 

      Console.WriteLine("Garage is now closed"); 
      Console.ReadKey(); 
     } 

     private static void GarageCount(string cars, string s) 
     { 
      Console.WriteLine(string.Format("{0} {1}", cars, s)); 
      System.Threading.Thread.Sleep(2000); 
     } 
    } 

    public class Traffic 
    { 
     public void PutInGarage(Garage g) 
     { 
      List<Vehicle> all = GetVehicles(); 

      Vehicle modelWeFix = new Vehicle() { Make = "Mazda", Model = "6", Year = "2012" }; 
      int i = 1; 
      foreach (IEquatabled<Vehicle> item in all) 
      { 
       if (item.EqualsTo(modelWeFix)) 
       { 
        g.CarsInGarage = i; 
        i++; 
       } 
      } 
     } 

    private List<Vehicle> GetVehicles() 
    { 
     Car carMazda = new Car() { Make = "Mazda", Model = "6", Year = "2012" }; 
     Car carFord = new Car() { Make = "Ford", Model = "Sport", Year = "2002" }; 
     Car carUnknown = new Car() { Make = "Mazda", Model = "5", Year = "2012" }; 
     Bike mazdaBike = new Bike() { Make = "Mazda", Model = "6", Year = "2012" }; 

     IEquatabled<Vehicle> unknownBike = mazdaBike; 

     List<Vehicle> all = new List<Vehicle>(); 
     all.Add(carMazda); 
     all.Add(carFord); 
     all.Add(carUnknown); 
     all.Add(mazdaBike); 
     return all; 
    } 
} 

    public class Garage 
    { 
     public delegate void NewCarDelegate(string numberOfCars, string message); 
     public event NewCarDelegate NewCarEvent; 

     private int _carsInGarage; 
     public int CarsInGarage 
     { 
      get { return _carsInGarage; } 
      set 
      { 
       if (NewCarEvent != null) 
       { 
        _carsInGarage = value; 
        NewCarEvent(value.ToString(), " cars in the garage."); 
       } 
      } 
     } 

     public Garage() 
     { 
      CarsInGarage = 0; 
     } 
    } 

    public class Vehicle : IEquatabled<Vehicle> 
    { 
     public string Make { get; set; } 
     public string Model { get; set; } 
     public string Year { get; set; } 
     public virtual int Wheels { get; set; } 

     //Implementation of IEquatable<T> interface 
     public bool EqualsTo(Vehicle car) 
     { 
      if (this.Make == car.Make && this.Model == car.Model && this.Year == car.Year) 
       return true; 
      else 
       return false; 
     } 

    } 

    public class Car : Vehicle 
    {} 

    public class Bike : Vehicle 
    {} 

    interface IEquatabled<T> 
    { 
     bool EqualsTo(T obj); 
    } 
} 

Answer 1

回答評論：

肯定的方法應該是在車庫對象？ Garage.StoreTraffic（交通） - 實施似乎倒退。交通不應該對車庫行爲負責。 - Charleh 2月28日15:25

這說明我確實需要通過一個實例作爲參數，還幫助解決我的實現！

Answer 2

不要將它傳遞到每個呼叫放入車庫，但它是更有意義的創建與車庫的交通實例。

 Garage g = new Garage(); 
     g.NewCarEvent += new Garage.NewCarDelegate(GarageCount); 

     Traffic traffic = new Traffic(g); // pass your garage here. 

     traffic.PutInGarage();