Different Types of Readonly Properties

Question

In C# 6 you can have the following property:

public Uri MyProperty => new Uri();

Or you can have this:

public Uri MyProperty1 { get; } = new Uri();

Whats the difference between them?

score 2 · Accepted Answer · answered Feb 02 '17 at 16:57

2

The first returns a new Uri object each time you access the property - the second initializes the property to a new Uri object and gives the same object every time.

answered Feb 02 '17 at 16:57

D Stanley

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Do you know what that's called? I'm assuming it's new to 6.0? – rory.ap Feb 02 '17 at 16:58
The first is an expression bodied property - the second is a getter-only automatic property. Both are new to C# 6.0. – D Stanley Feb 02 '17 at 17:04
Golly, why would anyone want that first one? I think I would prefer a method – Feb 02 '17 at 17:10
@MickyD Sure, a method would do the exact same thing. It's purely a style choice. It's more "functional". – D Stanley Feb 02 '17 at 17:13
I guess so :) +1 – Feb 02 '17 at 17:23

Fabjan · Answer 2 · 2017-02-02T17:37:53.407

0

The difference is that this will create a new instance of Uri every time:

public Uri MyProperty => new Uri();

And this will work with backing field with assigned value:

public Uri MyProperty1 { get; } = new Uri();

edited Feb 02 '17 at 17:37

answered Feb 02 '17 at 16:58

Fabjan

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Different Types of Readonly Properties

2 Answers2