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I got the compile error message "Array size cannot be specified in a variable declaration (try initializing with a 'new' expression)" when I tried to declare an array of linked lists.

public LinkedList<LevelNode>[2] ExistingXMLList;

Also, if I wanted to create a small array of strings, isn't the following the correct way?

string [2] inputdata;
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3 Answers 3

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8

You declare an array with just [].

LinkedList[] XMLList;

Then you instantiate it with the size.

XMLList = new LinkedList[2];

Or both at the same time:

LinkedList[] XMLList = new LinkedList[2];

To add LinkedLists to this array you type:

XMLList[0] = new LinkedList();
XMLList[1] = new LinkedList();
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5 Comments

Oops, sorry about that. I never use arrays.
No need to apologize, Visual Studio spoils us all!
What if you are using an array of a class where the constructor seems to require a paramenter? If you use new like this: XmlTextReader[] r; r = new XmlTextReader [2]; Then how would you pass the filename to r[0] and r[1] ?
This code is instantiating an Array. If you want to add values to that array you have to do XMLList[0] = new XMLList();
I am not able to use in a .NET Core 3.1 console app. Did this change?
1

try this:

LinkedList[] ExistingXMLList = new LinkedList[2];
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1 Comment

I thought I was crazy, but then I decided that even with 15.5k rep he could still make a mistake.
-1

You can try this
LinkedList<>[] adjacentList = new LinkedList<>[2];
using the generic type linked list requires 1 type parameter

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