Question

This is my code :

protected IEnumerable<Hotel> Hotels;
protected Hotel Hotel;

Hotels = from Hotel hotel in new Hotels()
         select hotel;

Response.Write("RES " + Hotels.Count() + "<br />");
if (Hotels.Count() > 0)
{
    Hotel = Hotels.First();
}
Response.Write("RES " + Hotels.Count() + "<br />");
Response.Write("RES " + Hotels.Count() + "<br />");

Well, Hotels have 1 item on it. But the result it :

RES 1
RES 0
RES 1

Why? Seems that .First() make confusion with iterator? How can I fix it using IEnumberable? (without using another kind of list, I need IEnumerable).

Answer 1

static void Main(string[] args)
{
    IEnumerable<String> Hotels = new List<String>{"sdsfsdf"};
    String Hotel;

    Console.WriteLine("RES " + Hotels.Count());
    if (Hotels.Count() > 0)
    {
        Hotel = Hotels.First();
    }
    Console.WriteLine("RES " + Hotels.Count());
    Console.WriteLine("RES " + Hotels.Count());
}

prints

RES 1
RES 1
RES 1

As expected, how are you filling the enumerable and what type are you creating it as?

If you are filling this via an un-executed queriable you might get weird behavior like this as it will pick the first useage (ie First() in this case).