C# 4 and .NET 4

268 ❘ ChaPTer 11 lAnGuAGe inteGrAted Query
IFormattable to support different variants of format strings, and the interface IComparable,
which can be used to sort a list of racers based on the LastName. For doing more advanced queries, the
class Racer contains not only single value properties such as FirstName, LastName, Wins, Country, and
Starts, but also multivalue properties such as Cars and Years. The Years property lists all the years of the
championship title. Some racers have won more than one title. The Cars property is used to list all the cars
that have been used by the driver during the title years.
using System;
using System.Text;
namespace Wrox.ProCSharp.LINQ
{
[Serializable]
public class Racer: IComparable, IFormattable
{
public Racer(string firstName = null, string lastName = null,
string country = null, int starts = 0, int wins = 0,
IEnumerable years = null, IEnumerable cars = null)
{
this.FirstName = firstName;
this.LastName = lastName;
this.Country = country;
this.Starts = starts;
this.Wins = wins;
var yearsList = new List();
foreach (var year in years)
{
yearsList.Add(year);
}
this.Years = yearsList.ToArray();
var carList = new List();
foreach (var car in cars)
{
carList.Add(car);
}
this.Cars = carList.ToArray();
}
public string FirstName {get; set;}
public string LastName {get; set;}
public int Wins {get; set;}
public string Country {get; set;}
public int Starts {get; set;}
public string[] Cars { get; private set; }
public int[] Years { get; private set; }
public override string ToString()
{
return String.Format("{0} {1}", FirstName, LastName);
}
public int CompareTo(Racer other)
{
if (other == null) throw new ArgumentNullException("other");
return this.LastName.CompareTo(other.LastName);
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