How to assign an expression to a class property in C#6

Consider the following Person class written using the new immutable property syntax of C# 6:

public class Person
{
	public int Age { get; }
	public string FirstName { get;}
	public string LastName { get; }

	public Person(string firstName, string lastName, int age)
	{
		FirstName = firstName;
		LastName = lastName;
		Age = age;
	}
}

Then let’s say you’d like to add a new property that returns the full name of the person. In C# 5 you’d write something like this:

public string FullName
{
	get
	{
		return string.Format("{0} {1}", FirstName, LastName);
	}
}

Note that the “get” body is very simple, it’s only one line.

In C# 6 we can assign expressions to properties using the familiar “=>” operator as follows:

public string FullName => string.Format("{0} {1}", FirstName, LastName);

How neat is that? You can call this property on the Person object as you would in any other case:

Person p = new Person("John", "Smith", 28);
Console.WriteLine(p.FullName);

…which prints John Smith as expected.

Let’s add one more example. We’ll add an Old property with a simple logic. Anyone over and above the age of 35 will be old. That includes me as well, don’t worry:

public bool Old => Age > 35;

Calling p.Old on the above example will return false.

View all various C# language feature related posts here.

Advertisements

About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

ultimatemindsettoday

A great WordPress.com site

Elliot Balynn's Blog

A directory of wonderful thoughts

Robin Sedlaczek's Blog

Developer on Microsoft Technologies

HarsH ReaLiTy

A Good Blog is Hard to Find

Softwarearchitektur in der Praxis

Wissenswertes zu Webentwicklung, Domain-Driven Design und Microservices

the software architecture

thoughts, ideas, diagrams,enterprise code, design pattern , solution designs

Technology Talks

on Microsoft technologies, Web, Android and others

Software Engineering

Web development

Disparate Opinions

Various tidbits

chsakell's Blog

Anything around ASP.NET MVC,WEB API, WCF, Entity Framework & AngularJS

Cyber Matters

Bite-size insight on Cyber Security for the not too technical.

Guru N Guns's

OneSolution To dOTnET.

Johnny Zraiby

Measuring programming progress by lines of code is like measuring aircraft building progress by weight.

%d bloggers like this: