Converting dictionary keys to array in Unity

Question

How do I convert a dictionary keys' to array in Unity 4.3? (other than manually, of course)

This solution doesn't seem to work, and I'm puzzled about why.

Code:

private Dictionary<int,Client> uid2Client;
public static int[] uidList
{
    get
    {
        return instance.uid2Client.Keys.ToArray();
    }
}

Error:

Assets/sources/ClientServer.cs(144,57): error CS1061: Type `System.Collections.Generic.Dictionary<int,Client>.KeyCollection' does not contain a definition for `ToArray' and no extension method `ToArray' of type `System.Collections.Generic.Dictionary<int,Client>.KeyCollection' could be found (are you missing a using directive or an assembly reference?)

House · Accepted Answer · 2014-06-16 16:34:20Z

7

The ToArray() method is not a standard part of the KeyCollection class. It's an extension method added by Linq.

Add Using System.Linq; to the beginning of your class file.

answered Jun 16, 2014 at 16:34

House

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2 Comments

House Over a year ago

Actually, they cover this in the first comment on the accepted solution to the question you link...

o0'. Over a year ago

Didn't notice the comment. They say they are ephemeral and should be incorporated into the posts, don't they? ;)

Kanadaj · Accepted Answer · 2014-06-16 16:32:43Z

0

You can try manually extracting the keys into an array:

int[] getKeys()
{
    List<int> keys = new List<int>();
    var keycollection = uid2Client.Keys;
    foreach(var key in keycollection)
    {
        keys.Add(key);
    }
    int[] keyArray = keys.ToArray();
    return keyArray;
}

answered Jun 16, 2014 at 16:32

Kanadaj

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1 Comment

o0'. Over a year ago

Sure I can do it manually, the whole point of this question is to understand if there is an automatic, possibly one-line, way. Also, to understand why that other method doesn't work.

Janis · Accepted Answer · 2022-03-15 18:04:34Z

-1

int[] KeysToArray(){

    int[] array = new List<int>(dictionary.keys).ToArray();

    return array;

}

answered Mar 15, 2022 at 18:04

Janis

1

1 Comment

BDL Over a year ago

Why would you want to create a list before converting it to an array? That's just double the work and memory consumption.

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