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Question by AyyZerr · Jul 18, 2016 at 11:58 AM · c#argumentoutofrangeexception

Argument is out of range whilst using a for loop. Yet when I insert indexes manually it works fine (C#)

 void moveChildren(Vector3[] captainNodes, bool pathsuccess, List<basic_unit_01> children){
         for(int i = 0; i < children.Count; i++) {
             if (obstacleCheck (children[i], captainNodes [0])) {
                 print(children[i].transform.position);
                 pathRequestManager.requestPath (children[i].transform.position, captainNodes[0], (childNodes, test) => addPaths(children[i], childNodes, captainNodes, test));
             } else {
                 children[i].onPathFound (captainNodes, true);
             }
         }
     }

Super confused. I've checked what values the for loop outputs, and when I insert the functions manually it is fine. The only thing I can think of is that my lambda expression may be messing things up due to me being a complete noob at using them. Thanks in advance.

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Answer by Dave-Carlile · Jul 18, 2016 at 12:06 PM

You need to get a children[i]reference into its own variable and pass that reference to the lambda. Because closures close over variables, not over values it's always seeing the last value assigned to i, not whatever children[i] was when the delegate was created. It's a little confusing (still is to me and I have to re-read that blog every time it comes up) but you should be able to just make a copy into a separate variable so the closure can capture it.

 var child = children[i];
 pathRequestManager.requestPath(child, ...)

Another option would be to make a copy of the index itself...

 int closureIndex = i;
 pathRequestManager.requestPath(children[closureIndex]...


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avatar image AyyZerr · Jul 18, 2016 at 12:14 PM 0
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Worked like a charm, thanks! I'll make sure to read over that post so it doesn't happen again.

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