C#•17mo ago

❔ Initializing an object

Hello, what is the difference between these two lines?

var p = new Point() { X = 42, Y = 13 };

var p = new Point() { X = 42, Y = 13 };

and

var p = new Point(42, 13);

var p = new Point(42, 13);

I know that the first allows you to initiate an object, but I don't understand the difference

7 Replies

Angius•17mo ago

First is initializer syntax, the second one uses a constructor And thus, requires a constructor The first one requires public properties, but a constructor isn't needed

ValwexOP•17mo ago

Thanks, but how do I know whether to use one or the other?

Angius•17mo ago

If you have a constructor, you should probably use it If you only have properties, you can use the first one Or you can mix them Just... use what's needed, I guess Initializer syntax is basically shortcut for

var point = new Point();
point.X = 42;
point.Y = 13;

var point = new Point();
point.X = 42;
point.Y = 13;

mindhardt•17mo ago

Unless you use init, which complicates stuff a bit

palapapa•17mo ago

Like what @mindhardt said, if you have a init only property, then it must be set either in the constructor or in the object initializer(your first example), and it can't be set afterwards.

Unknown User•17mo ago

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Accord•17mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Initializing an object