Error with Linq ForEach method when trying to build solution

Unity Engine
1

I got a method that’s meant to destroy my objects:

private void ResetMeter()
 {
 lines.Clear();

 var children = new List<GameObject>();

 foreach (Transform child in TicksPanel.transform)
 children.Add(child.gameObject);

 foreach (Transform child in LinesPanel.transform)
 children.Add(child.gameObject);

 //foreach (var child in children)
 // Destroy(child);

children.ForEach(x => Destroy(x));
 }

Now, this works perfectly fine in the unity editor
but if i try to build the solution, i get an error:
‘System.Collections.Generic.List<UnityEngine.GameObject>’ does not contain a definition for ‘ForEach’ and no extension method ‘ForEach’

But if i use the regular non-linq ForEach (which i’ve commented in the code) it works fine and i can build fine.
why can’t i use the linq?

(and yes, i am using “using System.Linq;”)

2

Try

foreach (GameObject c in children)
Destroy(c);
3

I have a feeling you didn’t read my question :stuck_out_tongue:
(and also, look at what i commented in code…)

1 Like
4

What platform are you targetting and what do your build and player settings look like?

5

I’m targeting Windows Store (windows 8.1)
and i checked developers build, and C# projects

6

Based on some quick Internet research, I don’t think there is a ForEach method in Linq. There is, however, a ForEach method in the List class, which is the object you’re using, so that’s presumably what you mean.

I did find this discussion saying that it was removed from the “Metro” version of the library, which may be your issue.

7

It’s an extension method of List but it’s in the System.Linq namespace.

But yes - appears to be a platform issue.

8

MSDN lists it as a class method, not an extension method.

9

well, you learn something new every day :slight_smile:
thanks for the find.
didn’t really matter much, but I was just curious.

and i gotta say, the reason for removing it is just weird :S
they said it’s because you could change the list while iterating over it… but you could do the same thing in a normal ForEach loop too…

And Antistone, that’s weird, cause you have to be using linq to get that method.

10

I’m aware.

You actually can’t modify the collection itself inside a foreach loop.