Question

I’m newb with generics/iterators/enumerators etc.

I have code, it keeps field number (int) and error mesages (List string) for each field:

  public class ErrorList : IEnumerable // ?
  {
        private Dictionary <int, List<string>> errorList;

        // ...
  }

How to make this class work with foreach loop? I wanna use GetEnumerator form Dictionary, but how should i do this?

Answer 1

You could simply provide a public GetEnumerator method:

public class ErrorList
{
    private Dictionary<int, List<string>> errorList = new Dictionary<int, List<string>>();

    ... some methods that fill the errorList field

    public IEnumerator<KeyValuePair<int, List<string>>> GetEnumerator()
    {
        return errorList.GetEnumerator();
    }
}

and now assuming you have an instance of ErrorList:

var errors = new ErrorList();

you can loop through them:

foreach (KeyValuePair<int, List<string>> item in errors)
{
    ...
}