List does not exist in current context

Unity Engine
1

I was trying to make an int list to store my values, so I defined it outside of any method and then wanted to set its length inside the start method, but I got an error (defined in the title of the thread). Here’s my code …

public class Player : MonoBehaviour {

    private List<int>[] possibleValues;
    private string currentMode = "";
    private string[] playModes = {"evenToOdd", "oddToEven", "incremental"};
    public Text chosenValues;

    // Use this for initialization

    public GameObject prefab;

    void Start() {
        possibleValues = new List<int>[2];
        for (int x = 0; x < Random.Range (6,10); x++) {
            GameObject go = Instantiate(prefab, new Vector3(Random.Range (-4,4), 1, Random.Range (-4,4)), Quaternion.identity) as GameObject;
            Clickable clicky = go.GetComponent<Clickable>();
            clicky.initiate(this, Random.Range (0,10));
        }
    }
2

List<> is part of the System.Collections.Generic namespace, make sure you have using System.Collections.Generic; in the header of your script.

1 Like
3

Do you know how to convert a list into a string connected by commas for each element? I’m having problems doing so :confused:

4

Using StringBuilder from System.Text, you could do something like this considering your list (possibleValues) contains integers:

System.Text.StringBuilder sb = new System.Text.StringBuilder();

// IEnumerable iteration using bool to check if we're on first value
bool firstValue = true;

foreach(int _int in possibleValues)
{
   if(firstValue)
   {
     sb.Append(_int);
     firstValue = false;
   }
   else
   {
     sb.Append("," + _int);
   }
}

// For loop grabbing values by index
for(int i = 0; i < possibleValues.Count; i++)
{
   if(i == 0)
   {
     sb.Append(possibleValues[i]);
   }
   else
   {
     sb.Append("," + possibleValues[i]);
   }
}

Debug.Log("Final string: " + sb.ToString());

Either one should work. Applying StringBuilder here because I read an article recently that appending strings manually can cause some excess work for the GC.

edit: I think I read something about IEnumerable iterations as well, can’t remember what exactly. If anybody reading this knows maybe clear it up for me, are IEnumerable iterations hefty towards memory management?

5

GC being “garbage collection”, the process that unity does to clean up the mess you most likely never realise your making behind the scenes until your project grinds to a halt for “no reason” :smile: