Best practice to avoid InvalidOperationException: Collection was modified?

Question

Very often I need something like that:

 foreach (Line line in lines)
 {
    if (line.FullfilsCertainConditions())
    {
       lines.Remove(line)
    }
 }
         


        

Answer 1

You could simply replace original list with filtered one:

lines = lines.Where(line => line.FullfilsCertainConditions()).ToList();