From d46d59c3df67ad223d93e113ae9a668b757ce722 Mon Sep 17 00:00:00 2001
From: = <=>
Date: Fri, 1 Mar 2019 14:13:08 +0300
Subject: [PATCH 1/3] Somebody once told me

---
 Product.cs          |  6 ++++++
 ProductEventArgs.cs | 18 ++++++++++++++++--
 Program.cs          | 33 ++++++++++++++++++++++++++++++---
 3 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/Product.cs b/Product.cs
index f68c8c9..bd015c7 100644
--- a/Product.cs
+++ b/Product.cs
@@ -32,11 +32,13 @@ public string Name
             get { return name; }
             set
             {
+                string oldName = name;
                 name = value;
                 /* 
                  * TODO #4 Инициировать уведомление об 
                  * изменении наименования
                  */
+                OnNameChanged?.Invoke(this, new ProductEventArgs(oldName));
             }
         }
         /// <summary>
@@ -47,11 +49,13 @@ public decimal Price
             get { return price; }
             set
             {
+                decimal oldPrice = price;
                 price = value;
                 /*
                  * TODO #5 Инициировать уведомление об 
                  * изменении стоимости
                  */
+                OnPriceChanged?.Invoke(this, new ProductEventArgs(oldPrice));
             }
         }
 
@@ -62,6 +66,8 @@ public decimal Price
         /* 
          * TODO #3 Добавить определение событий
          */
+        public static event EventHandler<ProductEventArgs> OnNameChanged;
+        public static event EventHandler<ProductEventArgs> OnPriceChanged;
 
         #endregion
 
diff --git a/ProductEventArgs.cs b/ProductEventArgs.cs
index a79a6d6..499df68 100644
--- a/ProductEventArgs.cs
+++ b/ProductEventArgs.cs
@@ -1,4 +1,6 @@
-namespace Events
+using System;
+
+namespace Events
 {
     /// <summary>
     /// Класс, который служит для передачи аргументов 
@@ -8,11 +10,23 @@
     /*
      * TODO #1 Закончить определение класса ProductEventArgs
      */
-    class ProductEventArgs
+    class ProductEventArgs : EventArgs
     {
         /* 
          * TODO #2 Добавить определение необходимых компонент 
          * класса ProductEventArgs
          */
+
+        public string OldName; //{get; private set;}
+        public decimal OldPrice; //{get; private set;}
+
+        public ProductEventArgs(string oldName)
+        {
+            this.OldName = oldName;
+        }
+        public ProductEventArgs(decimal oldPrice)
+        {
+            this.OldPrice = oldPrice;
+        }
     }
 }
diff --git a/Program.cs b/Program.cs
index b9247f7..16d6d39 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,4 +1,7 @@
-namespace Events
+using System;
+using System.IO;
+
+namespace Events
 {
     class Program
     {
@@ -17,21 +20,45 @@ internal Product Product
 
         static void Main(string[] args)
         {
-            Product product = new Product("Some product name", 0);
-            
+            var product = new Product("Some product name", 0);
+
             /* 
              * TODO #6 Назначить обработчики событий в текущем контексте 
              */
+            Product.OnNameChanged  += OnProductNameChanged;
+            Product.OnPriceChanged += OnProductPriceChanged;
 
             /*
              * TODO #7 Выполнить с экземпляром класса Product действия, 
              * приводящие к возникновению описанных Вами событий
              */
+             product.Name  = "Plumbus";
+             product.Price = 911;
+
+             product.Name  = "Baldezh";
+             product.Price = 1729;
+             product.Price = 2019;
         }
 
         /* 
          * TODO #8 Добавить определение обработчиков событий 
          */
+        static void OnProductNameChanged(object sender, ProductEventArgs e)
+        {
+            var product = sender as Product;
+            Console.WriteLine(
+                  $"The product \"{e.OldName}\""
+                + $"is now called \"{product.Name}\"."
+            );
+        }
+        static void OnProductPriceChanged(object sender, ProductEventArgs e)
+        {
+            var product = sender as Product;
+            Console.WriteLine(
+                  $"The \"{product.Name}\" product's price has changed"
+                + $"from {e.OldPrice}$ to {product.Price}$."
+            );
+        }
 
     }
 }

From e80335a9717684ded44da5019e0e12c4b2989c45 Mon Sep 17 00:00:00 2001
From: = <=>
Date: Fri, 1 Mar 2019 17:48:52 +0300
Subject: [PATCH 2/3] The world is gonna roll me

---
 Product.cs          | 2 +-
 ProductEventArgs.cs | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Product.cs b/Product.cs
index bd015c7..eef09c6 100644
--- a/Product.cs
+++ b/Product.cs
@@ -73,7 +73,7 @@ public decimal Price
 
         public Product(string name, decimal price)
         {
-            Name = name;
+            Name  = name;
             Price = price;
         }
 
diff --git a/ProductEventArgs.cs b/ProductEventArgs.cs
index 499df68..b5f912c 100644
--- a/ProductEventArgs.cs
+++ b/ProductEventArgs.cs
@@ -17,8 +17,8 @@ class ProductEventArgs : EventArgs
          * класса ProductEventArgs
          */
 
-        public string OldName; //{get; private set;}
-        public decimal OldPrice; //{get; private set;}
+        public string  OldName  { get; private set; }
+        public decimal OldPrice { get; private set; }
 
         public ProductEventArgs(string oldName)
         {

From e257df899c10fd76c3e1c0f036cb315bf8d5f569 Mon Sep 17 00:00:00 2001
From: = <=>
Date: Fri, 1 Mar 2019 17:53:05 +0300
Subject: [PATCH 3/3] I ain't the sharpest tool in the shed

---
 Program.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Program.cs b/Program.cs
index 16d6d39..a328b99 100644
--- a/Program.cs
+++ b/Program.cs
@@ -47,7 +47,7 @@ static void OnProductNameChanged(object sender, ProductEventArgs e)
         {
             var product = sender as Product;
             Console.WriteLine(
-                  $"The product \"{e.OldName}\""
+                  $"The product \"{e.OldName}\" "
                 + $"is now called \"{product.Name}\"."
             );
         }
@@ -55,7 +55,7 @@ static void OnProductPriceChanged(object sender, ProductEventArgs e)
         {
             var product = sender as Product;
             Console.WriteLine(
-                  $"The \"{product.Name}\" product's price has changed"
+                  $"The \"{product.Name}\" product's price has changed "
                 + $"from {e.OldPrice}$ to {product.Price}$."
             );
         }