What does a ? do in a new Type?[5] assignment?

Question

I have the following piece of code, and I have no idea what the ? means in the construct.

What is it doing?

myObj_Request r = new myObj_Request(); //instantiate intial object
r.Channels = new ChannelSequence();    //initial object has another object in channels
r.Channels.ChannelType = new ChannelType?[5] { .. } // ok so we have 5 channeltypes...
                                                    // but  that ? infront of [5] ?

This has many many duplicates. – CodesInChaos Jul 19 '13 at 10:49 — CodesInChaos, Jul 19 '13 at 10:49

Nickon · Accepted Answer · 2013-07-19T10:59:48.847

2

It's a nullable type. Difference?

int c = 5; // you can set only numbers

int? d = null; // you can set int or null
int? e = 5;

int? is ~~basically~~ exactly equal to Nullable<int>.

Here's the reference: MSDN

[edit]

So new ChannelType?[5] is an array (5 elements) of Nullable<ChannelType>.

edited Jul 19 '13 at 10:59

answered Jul 19 '13 at 10:47

Nickon

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It's not basically equal to; it's exactly the same. – Joey Jul 19 '13 at 10:56
Yes, exactly:) I wrote it badly, but nvm:) – Nickon Jul 19 '13 at 10:58

score 1 · Answer 2 · edited Jul 19 '13 at 10:49

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Nullable type: check Link . You'll find more here.

edited Jul 19 '13 at 10:49

Jakub Konecki

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answered Jul 19 '13 at 10:48

Andrei Neculai

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score 0 · Answer 3 · answered Jul 19 '13 at 10:50

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"?" this will be used to make VeluTypes to NullableTypes

Ex:

Int is value type. You can't assign null to it. If you declare it like int?...you can assign null here

answered Jul 19 '13 at 10:50

Murugavel

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What does a ? do in a new Type?[5] assignment?

3 Answers3