Expression Bodied Indexers And Operators With C# 7

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

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”.

code snippet

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

Complete code with its usage

using System.Drawing;
using static System.Drawing.Color;
using static System.Console;
using Humanizer;
using static Humanizer.OrdinalizeExtensions;
namespace ExpressionBodiedIndexersExample
{
class Program
{
static void Main(string[] args)
{
MyFavColor myFavColor = new MyFavColor();
WriteLine("My color preferences are :");
for (int i = 0; i < 5; i++)
{
WriteLine($"{(i+1).Ordinalize()} : {myFavColor[i]}");
}
}
}
class MyFavColor
{
private Color[] favColor = new Color[] {Red, Green, Blue,Yellow, Orange};
public string this[int index] => favColor[index].Name;
}
}

Output

Expression bodied Operators Overloading

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

Code Snippet

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

Complete code

using static System.Console;
namespace ExpressionbodiedOperatorsExample
{
class Program
{
static void Main(string[] args)
{
Employee emp = new Employee { Age = 25, Salary = 80000 };
emp++;
WriteLine($"Age: {emp.Age}, Salary : {emp.Salary}");
}
}
class Employee
{
public int Age { get; set; }
public int Salary { get; set; }
public static Employee operator ++(Employee emp) =>
new Employee { Age = emp.Age + 1, Salary = emp.Salary + 2000 };
}
}

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.

3 Comments

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Bhavesh Jadav8y ago
Great article sir........
Bhavesh Jadav8y ago
Hello Sir,What is the output of the below line? WriteLine($"Age: {emp.Age}, Salary : {emp.Salary}"); Is it right below output? Age:26, Salary : 10000
- Banketeshvar Narayan8y ago
  Yes, the above output is correct.