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Ulianov Alex 33536/2 #18

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21 changes: 18 additions & 3 deletions Product.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ class Product
/// </summary>
private decimal price;

#endregion
#endregion

#region Properties

Expand All @@ -32,7 +32,13 @@ public string Name
get { return name; }
set
{
var args = new ProductNameChangedEventArgs(name, value);
name = value;
if (NameChanged != null)
{
NameChanged(this, args);
}

/*
* TODO #4 Инициировать уведомление об
* изменении наименования
Expand All @@ -47,23 +53,32 @@ public decimal Price
get { return price; }
set
{
var args = new ProductPriceChangedEventArgs(price, value);
price = value;
if (PriceChanged != null)
{
PriceChanged(this, args);
}
/*
* TODO #5 Инициировать уведомление об
* изменении стоимости
*/
}
}

#endregion
#endregion

#region Events

public event EventHandler<ProductNameChangedEventArgs> NameChanged;

public event EventHandler<ProductPriceChangedEventArgs> PriceChanged;

/*
* TODO #3 Добавить определение событий
*/

#endregion
#endregion

public Product(string name, decimal price)
{
Expand Down
35 changes: 33 additions & 2 deletions ProductEventArgs.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
namespace Events
using System;
namespace Events
{
/// <summary>
/// Класс, который служит для передачи аргументов
Expand All @@ -8,11 +9,41 @@
/*
* TODO #1 Закончить определение класса ProductEventArgs
*/
class ProductEventArgs
class ProductEventArgs : EventArgs
{
public string Name { get; }
public decimal Price { get; }

public ProductEventArgs(string name, decimal price)
{
Name = name;
Price = price;
}
/*
* TODO #2 Добавить определение необходимых компонент
* класса ProductEventArgs
*/
}

class ProductNameChangedEventArgs : EventArgs
{
public string NewName { get; }
public string OldName { get; }
public ProductNameChangedEventArgs(string oldName, string newName)
{
OldName = oldName;
NewName = newName;
}
}

class ProductPriceChangedEventArgs : EventArgs
{
public decimal NewPrice { get; }
public decimal OldPrice { get; }
public ProductPriceChangedEventArgs(decimal oldPrice, decimal newPrice)
{
OldPrice = oldPrice;
NewPrice = newPrice;
}
}
}
19 changes: 17 additions & 2 deletions Program.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
namespace Events
using System;
namespace Events
{
class Program
{
Expand All @@ -18,7 +19,10 @@ internal Product Product
static void Main(string[] args)
{
Product product = new Product("Some product name", 0);

product.NameChanged += OnProductNameChanged;
product.PriceChanged += OnProductPriceChanged;
product.Name = "New IPhone";
product.Price = 10000999;
/*
* TODO #6 Назначить обработчики событий в текущем контексте
*/
Expand All @@ -29,6 +33,17 @@ static void Main(string[] args)
*/
}


private static void OnProductNameChanged(object sender, ProductNameChangedEventArgs e)
{
Console.WriteLine("Было -" + e.OldName + ". Стало -" + e.NewName);
}

private static void OnProductPriceChanged(object sender, ProductPriceChangedEventArgs e)
{

Console.WriteLine("Was - " + e.OldPrice + ". And now - " + e.NewPrice);
}
/*
* TODO #8 Добавить определение обработчиков событий
*/
Expand Down