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

Build a new list instaed:

public IList GetListWithoutFullfilsCertainConditions(IList fullList) 
{
    IList resultList = new List(fullList.Count);

    foreach (Line line in fullList)
    {
       if (!line.FullfilsCertainConditions())
       {
          resultList.Add(line)
       }
    }

    return resultList;
}