Best method to use IDataReader as IEnumerable?

Question

I need to use Linq on any IDataReader implementations like this

var c = sqlDataReader.AsEnumerable().Count();

Example:

<

Answer 1

Try, this:

public static class DataReaderExtension
{
    public class EnumeratorWrapper
    {
        private readonly Func moveNext;
        private readonly Func current;

        public EnumeratorWrapper(Func moveNext, Func current)
        {
            this.moveNext = moveNext;
            this.current = current;
        }

        public EnumeratorWrapper GetEnumerator()
        {
            return this;
        }

        public bool MoveNext()
        {
            return moveNext();
        }

        public T Current
        {
            get { return current(); }
        }
    }

    private static IEnumerable BuildEnumerable(
            Func moveNext, Func current)
    {
        var po = new EnumeratorWrapper(moveNext, current);
        foreach (var s in po)
            yield return s;
    }

    public static IEnumerable AsEnumerable(this T source) where T : IDataReader
    {
        return BuildEnumerable(source.Read, () => source);
    }
}