Question

Here are two C# classes…

public class Address  
{  
    public string Country;  
    public string City;  
}

public class Traveller
{    
    public string Name;
    public List<Address> TravelRoute;
}

… and a list of data (filled somewhere) …

List<Traveller> Travellers;

… and then this LINQ query:

var result = from t in Travellers
             where t.TravelRoute.Any(a => a.Country == "F")
             select t;

foreach (var t in result)
    System.Console.WriteLine(t.Name);

I do not understand the query: What means the “Any” function and what does the “=>” operator do?

Can someone explain me what’s going on in this code? Thanks!

Answer 1

The line

a => a.Country == "F"

would translate to something like this if it was a separated LINQ statement:

From a as Adress in t.TravelRoute
Where a.Country = "F"
Select a

The any means it : Any.
In other word, it will return true if ANY of the objects in travelRoute has its Country property to “F”

Hope that helps