1 files changed, 114 insertions, 16 deletions

diff --git a/csharp.html.markdown b/csharp.html.markdown
index 963f38f4..3790747c 100644
--- a/csharp.html.markdown
+++ b/csharp.html.markdown
@@ -132,6 +132,12 @@ namespace Learning.CSharp
             DateTime fooDate = DateTime.Now;
             Console.WriteLine(fooDate.ToString("hh:mm, dd MMM yyyy"));
 
+            // Verbatim String
+            // You can use the @ symbol before a string literal to escape all characters in the string
+            string path = "C:\\Users\\User\\Desktop";
+            string verbatimPath = @"C:\Users\User\Desktop";
+            Console.WriteLine(path == verbatimPath);  // => true
+
             // You can split a string over two lines with the @ symbol. To escape " use ""
             string bazString = @"Here's some stuff
 on a new line! ""Wow!"", the masses cried";
@@ -634,6 +640,54 @@ on a new line! ""Wow!"", the masses cried";
         }
     }
 
+
+    // DELEGATES AND EVENTS
+    public class DelegateTest
+    {
+        public static int count = 0;
+        public static int Increment()
+        {
+            // increment count then return it
+            return ++count;
+        }
+
+        // A delegate is a reference to a method
+        // To reference the Increment method,
+        // first declare a delegate with the same signature
+        // ie. takes no arguments and returns an int
+        public delegate int IncrementDelegate();
+
+        // An event can also be used to trigger delegates
+        // Create an event with the delegate type
+        public static event IncrementDelegate MyEvent;
+
+        static void Main(string[] args)
+        {
+            // Refer to the Increment method by instantiating the delegate
+            // and passing the method itself in as an argument
+            IncrementDelegate inc = new IncrementDelegate(Increment);
+            Console.WriteLine(inc());  // => 1
+
+            // Delegates can be composed with the + operator
+            IncrementDelegate composedInc = inc;
+            composedInc += inc;
+            composedInc += inc;
+
+            // composedInc will run Increment 3 times
+            Console.WriteLine(composedInc());  // => 4
+
+
+            // Subscribe to the event with the delegate
+            MyEvent += new IncrementDelegate(Increment);
+            MyEvent += new IncrementDelegate(Increment);
+
+            // Trigger the event
+            // ie. run all delegates subscribed to this event
+            Console.WriteLine(MyEvent());  // => 6
+        }
+    }
+
+
     // Class Declaration Syntax:
     // <public/private/protected/internal> class <class name>{
     //    //data fields, constructors, functions all inside.
@@ -949,6 +1003,7 @@ on a new line! ""Wow!"", the masses cried";
 
     // String interpolation by prefixing the string with $
     // and wrapping the expression you want to interpolate with { braces }
+    // You can also combine both interpolated and verbatim strings with $@
     public class Rectangle
     {
         public int Length { get; set; }
@@ -961,6 +1016,9 @@ on a new line! ""Wow!"", the masses cried";
         {
             Rectangle rect = new Rectangle { Length = 5, Width = 3 };
             Console.WriteLine($"The length is {rect.Length} and the width is {rect.Width}");
+
+            string username = "User";
+            Console.WriteLine($@"C:\Users\{username}\Desktop");
         }
     }
 
@@ -1096,25 +1154,65 @@ namespace Learning.More.CSharp
     }
 }
 
+//New C# 7 Feature
+//Install Microsoft.Net.Compilers Latest from Nuget
+//Install System.ValueTuple Latest from Nuget
 using System;
 namespace Csharp7
 {
-	//New C# 7 Feature
-	//Install Microsoft.Net.Compilers Latest from Nuget
-	//Install System.ValueTuple Latest from Nuget
-	class Program
-	{
-		static void Main(string[] args)
-		{
-			//Type 1 Declaration
-			(string FirstName, string LastName) names1 = ("Peter", "Parker");
-			Console.WriteLine(names1.FirstName);
-
-			//Type 2 Declaration
-			var names2 = (First:"Peter", Last:"Parker");
-			Console.WriteLine(names2.Last);
-		}
-	}
+    // TUPLES, DECONSTRUCTION AND DISCARDS
+    class TuplesTest
+    {
+        public (string, string) GetName()
+        {
+            // Fields in tuples are by default named Item1, Item2...
+            var names1 = ("Peter", "Parker");
+            Console.WriteLine(names1.Item2);  // => Parker
+
+            // Fields can instead be explicitly named
+            // Type 1 Declaration
+            (string FirstName, string LastName) names2 = ("Peter", "Parker");
+
+            // Type 2 Declaration
+            var names3 = (First:"Peter", Last:"Parker");
+
+            Console.WriteLine(names2.FirstName);  // => Peter
+            Console.WriteLine(names3.Last);  // => Parker
+
+            return names3;
+        }
+
+        public string GetLastName() {
+            var fullName = GetName();
+
+            // Tuples can be deconstructed
+            (string firstName, string lastName) = fullName;
+
+            // Fields in a deconstructed tuple can be discarded by using _
+            var (_, last) = fullName;
+            return last;
+        }
+
+        // Any type can be deconstructed in the same way by
+        // specifying a Deconstruct method
+        public int randomNumber = 4;
+        public int anotherRandomNumber = 10;
+
+        public void Deconstruct(out int randomNumber, out int anotherRandomNumber)
+        {
+            randomNumber = this.randomNumber;
+            anotherRandomNumber = this.anotherRandomNumber;
+        }
+
+        static void Main(string[] args)
+        {
+            var tt = new TuplesTest();
+            (int num1, int num2) = tt;
+            Console.WriteLine($"num1: {num1}, num2: {num2}");  // => num1: 4, num2: 10
+
+            Console.WriteLine(tt.GetLastName());
+        }
+    }
 }
 
 ```