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Expression Bodied Indexers And Operators With C# 7

This is my fifth article on C# 7. Followings are the links for my previous articles.

  1. Top 10 New Features of C# 7 With Visual Studio 2017
  2. Visual Studio 15 Preview First Look & C# 7
  3. How to Compile & Test C# 7 Features
  4. Understanding ref and out With C# 7

In C# 7, indexers and operator overloading can be written as expression bodied members.

Expression bodied indexers

In C# 7, Indexers can be written as expression bodied members called as “Expression bodied indexers”.

C#

code snippet 

  1. class MyFavColor  
  2. {  
  3.     private Color[] favColor = new Color[] {Red, Green, Blue,Yellow, Orange};  
  4.     public string this[int index] => favColor[index].Name;  
  5. }  

Complete code with its usage 

  1. using System.Drawing;  
  2. using static System.Drawing.Color;  
  3. using static System.Console;  
  4. using Humanizer;  
  5. using static Humanizer.OrdinalizeExtensions;  
  6.   
  7. namespace ExpressionBodiedIndexersExample  
  8. {  
  9.     class Program  
  10.     {  
  11.         static void Main(string[] args)  
  12.         {  
  13.             MyFavColor myFavColor = new MyFavColor();  
  14.             WriteLine("My color preferences are :");  
  15.             for (int i = 0; i < 5; i++)  
  16.             {  
  17.                 WriteLine($"{(i+1).Ordinalize()} : {myFavColor[i]}");  
  18.             }  
  19.         }  
  20.     }  
  21.   
  22.     class MyFavColor  
  23.     {  
  24.         private Color[] favColor = new Color[] {Red, Green, Blue,Yellow, Orange};  
  25.         public string this[int index] => favColor[index].Name;  
  26.     }  
  27.   
  28. }   

Output

C#

Expression bodied Operators Overloading

In C# 7, operator overloading can be written as expression bodied members and called as “Expression bodied Operators Overloading”.

C#

Code Snippet 

  1. class Employee  
  2.     {  
  3.         public int Age { get; set; }  
  4.         public int Salary { get; set; }  
  5.         public static Employee operator ++(Employee emp) =>  
  6.         new Employee { Age = emp.Age + 1, Salary = emp.Salary + 2000 };  
  7.     }   

Complete code

  1. using static System.Console;  
  2.   
  3. namespace ExpressionbodiedOperatorsExample  
  4. {  
  5.     class Program  
  6.     {  
  7.         static void Main(string[] args)  
  8.         {  
  9.             Employee emp = new Employee { Age = 25, Salary = 80000 };  
  10.             emp++;  
  11.             WriteLine($"Age: {emp.Age}, Salary : {emp.Salary}");  
  12.         }  
  13.     }  
  14.   
  15.     class Employee  
  16.     {  
  17.         public int Age { get; set; }  
  18.         public int Salary { get; set; }  
  19.         public static Employee operator ++(Employee emp) =>  
  20.         new Employee { Age = emp.Age + 1, Salary = emp.Salary + 2000 };  
  21.     }  
  22. }   

If you are looking for an example of other expression bodied members, such as - expression bodied methods, expression bodied properties, expression bodied constructor, expression bodied destructor, expression bodied getters & expression bodied setters, then you can visit here.


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