c# how to check if queue contains object property with a specific value?

Question

I want to get Boolean value if queue contains object having particular value in the properties.

e.g)

public class Order
{
    public string orderType { get; set; }
    public string sCode { get; set; }  
    public int iNum { get; set; }
    ...omit... 
}
Queue<Order> queueSendOrder = new Queue<Order>();

Then, how to check if Queue contains or not if contains any object having sCode="Code1", iNum=1?

Thank you.

Queue is data structure which is not supposed to be used for traversing through all its items. Even if you manage to do that - it doesn't make much sense. Why don't you just use an array? — Yeldar Kurmangaliyev
– Yeldar Kurmangaliyev, Commented Apr 26, 2018 at 16:24
@YeldarKurmangaliyev Queue<T> implements IEnumerable<T> so it's perfectly reasonable to iterate over the contents. — DavidG
– DavidG, Commented Apr 26, 2018 at 16:29
@DavidG Still, checking whether a queue has something is not a usual thing to do... At least I've never done it. — Sweeper
– Sweeper, Commented Apr 26, 2018 at 16:30
@Sweeper True, but "unusual" doesn't mean you're not supposed to do it. — DavidG
– DavidG, Commented Apr 26, 2018 at 16:30
Why not just use the IEnumerable extension methods? You can do something like queueSendOrder.Any(o => o.iNum == 1 && o.sCode == "Code1") or var matchingItems = queueSendOrder.Where(o => o.sCode == "Code1").ToList(); — littlerufe
– littlerufe, Commented Apr 26, 2018 at 16:33

DavidG · Accepted Answer · 2018-04-26 16:37:38Z

5

Using the Linq Any() extension method, this is quite simple:

var containsCode1 = queueSendOrder.Any(o => o.sCode == "Code1");
var containsNum1 = queueSendOrder.Any(o => o.iNum == 1);

Or both:

var containsCode1AndNum1 = queueSendOrder.Any(o => 
    o.sCode == "Code1"
    && o.iNum == 1);

Side note: It's considered bad practice these days to use Hungarian notation to denote types. So sCode should really just be Code and iNum would be Num (though I would choose a better name than that)

edited Apr 26, 2018 at 16:37

answered Apr 26, 2018 at 16:31

DavidG

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