Question

I have a C# class derived from a generic list

public class CostCodes : List<CostCode>
{

    public CostCodes() : base()
    {
        Add(new CostCode { Description = "DOM0010 Fall Arr", ID = 1599 });
        Add(new CostCode { Description = "DOM0020 Acoustics", ID = 1600 });
    }

when I try to use the Find method on this derived class, no find method appears in intellisense.

var codes = new CostCodes();

CostCode costCode = codes.Find(...

Figured out that the problem was being caused by the classes being in the test silverlight project. Moved them out, but it would be good to know why it made a difference.

— UPDATE —

Cant answer my own question yet, but for those who are interested, this article shows why

http://forums.silverlight.net/t/67428.aspx/1

Apparently there is no Find method in silverlight projects. You have to use linq and the “first” method instead of find

using System.Linq;

var costCode = codes.First(cc => cc.ID == id);

Answer 1

Is this a problem with IntelliSense?

This compiles fine:

public class CostCode {
    public string Description { get; set; }
}

public class CostCodes : List<CostCode> {
    public CostCodes()
        : base() {
        Add(new CostCode {Description = "DOM0010 Fall Arr"});
        Add(new CostCode {Description = "DOM0020 Acoustics"});
    }
}

// In another class...
public static void Main(string[] argStrings) {
    CostCodes s = new CostCodes();
    var hasDescription = s.Find(cc => cc.Description != null);
}