Cant remove number from list: error message

[frankduc]

Hello,

For some reason i dont understand one item wont remove from my list.

int totalBarIndex = (ChartBars.ToIndex);

var listP = new List<int>() {194,389,584,779,974,1169,1364,1559,1754,1949,2144 ,2339,2729,3119,3509,3899,4289,4679,5069};

foreach(var list in listP)
{
if(list > totalBarIndex)
{
listP.Remove(194);
listP.Remove(389);
listP.Remove(584);
listP.Remove(779);
listP.Remove(974);
listP.Remove(1169);
listP.Remove(1364);
listP.Remove(1559);
listP.Remove(1754);
listP.Remove(1949);
listP.Remove(2144);
listP.Remove(2339);
listP.Remove(2729);
listP.Remove(3119);
listP.Remove(3509);
listP.Remove(3899);
listP.Remove(4289);
listP.Remove(4679);
listP.Remove(5069);
}
}

Here's the result:

I194
I389
I584
I779
I974
I1169
I1364
I1559
I1754
Indicator 'MyCustomIndicator6': Error on calling 'OnRender' method on bar 1754: Collection was modified; enumeration operation may not execute.

totalBarIndex = 1754

Often it will return the number just after the value of totalBarIndex in this case 1949 and will not remove it from the list.

Any idea why?

TY

[NinjaTrader_Kate]

Hello frankduc,

Thank you for your post.

You're trying to remove items on each iteration through the loop. So when it gets to a list item that is higher than the totalBarIndex, it loops through and removes all those from the list, then would go back to the top of the loop and try to iterate again but there's nothing left in the list, causing an error.

If you try using break; to get out of the loop once you've removed all list items, do you get the error?

Thanks in advance; I look forward to assisting you further.

[frankduc]

You are right!
Thank you Kate