Question

After looking on MSDN, it’s still unclear to me how I should form a proper predicate to use the Find() method in List using a member variable of T (where T is a class)

For example:

public class Car {    public string Make;    public string Model;    public int Year; }  {  // somewhere in my code    List<Car> carList = new List<Car>();    // ... code to add Cars ...     Car myCar = new Car();     // Find the first of each car made between 1980 and 2000    for (int x = 1980; x < 2000; x++)    {        myCar = carList.Find(byYear(x));        Console.Writeline(myCar.Make + myCar.Model);    } } 

What should my ‘byYear’ predicate look like?

(The MSDN example only talks about a List of dinosaurs and only searches for an unchanging value ‘saurus’ — It doesn’t show how to pass a value into the predicate…)

EDIT: I’m using VS2005/.NET2.0, so I don’t think Lambda notation is available to me…

EDIT2: Removed ‘1999’ in the example because I may want to ‘Find’ programatically based on different values. Example changed to range of cars from 1980 to 2000 using for-do loop.

Answer 1

Ok, in .NET 2.0 you can use delegates, like so:

static Predicate<Car> ByYear(int year) {     return delegate(Car car)     {         return car.Year == year;     }; }  static void Main(string[] args) {     // yeah, this bit is C# 3.0, but ignore it - it's just setting up the list.     List<Car> list = new List<Car>     {         new Car { Year = 1940 },         new Car { Year = 1965 },         new Car { Year = 1973 },         new Car { Year = 1999 }     };     var car99 = list.Find(ByYear(1999));     var car65 = list.Find(ByYear(1965));      Console.WriteLine(car99.Year);     Console.WriteLine(car65.Year); }