Question

After Deserializing a file with just one record

It seems that it’s in an infinitive loop

IndexSeries = (List<string>)bFormatter.Deserialize(fsSeriesIndexGet);
IndexSeries.ForEach(name => AddSerie(name));
//IndexSeries.ForEach(delegate(String name)
//{
      //    AddSerie(name);
//});

AddSerie will be executed infinitively !

Answer 1

If I define:

//class level declaration (in a console app)
static List<string> strings;

static void Loop(string s)
{
  Console.WriteLine(s);
  strings.Add(s + "!");
}

Then

static void Main(string[] args)
{
  strings = new List<string> { "sample" };
  strings.ForEach(s => Console.WriteLine(s));
}

executes normally, outputing a single string, while

static void Main(string[] args)
{
  strings = new List<string> { "sample" };
  strings.ForEach(s => Loop(s));
}

loops indefinitely, adding ‘!’s in the process, and

static void Main(string[] args)
{
  strings = new List<string> { "sample" };
  foreach (string s in strings)
  {
    Loop(s);
  }
}

throws an InvalidOperationException (Collection was modified; enumeration operation may not execute), which, in my opinion is the correct behavior. Why the List.ForEach method allows the list to be changed by the action, I do not know, but would like to find out 🙂