List转换成数组？？？

Question

class Package
    {
        public string Company { get; set; }
        public double Weight { get; set; }
        public long TrackingNumber { get; set; }
    }
class Packages : List<Package> { }
public partial class Form1 : Form
{
        public Form1()
        {
            InitializeComponent();
  Packages packages =
                new Packages
                        { new Package { Company = "Coho Vineyard", Weight = 25.2, TrackingNumber = 89453312L },
                          new Package { Company = "Lucerne Publishing", Weight = 18.7, TrackingNumber = 89112755L },
                          new Package { Company = "Wingtip Toys", Weight = 6.0, TrackingNumber = 299456122L },
                          new Package { Company = "Adventure Works", Weight = 33.8, TrackingNumber = 4665518773L } };//想最后拿到一个属性的数组，怎么搞？自己弄了个办法没搞定~~~
 Dictionary<long, Package> dictionary = packages.ToDictionary(p => p.TrackingNumber);
            long[] myShuZu  = dictionary.ToArray();
        }
}

Answer 1

是这样的吗？
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;namespace CSharpTest
{
    class Package
    {
        public string Company { get; set; }
        public double Weight { get; set; }
        public long TrackingNumber { get; set; }
    }
    class Packages : List<Package> { }
    class Program
    {        
        static void Main(string[] args)
        {
            Packages packages =
                new Packages
                        { new Package { Company = "Coho Vineyard", Weight = 25.2, TrackingNumber = 89453312L },
                          new Package { Company = "Lucerne Publishing", Weight = 18.7, TrackingNumber = 89112755L },
                          new Package { Company = "Wingtip Toys", Weight = 6.0, TrackingNumber = 299456122L },
                          new Package { Company = "Adventure Works", Weight = 33.8, TrackingNumber = 4665518773L }
                        };
            //想最后拿到一个属性的数组，怎么搞？自己弄了个办法没搞定~~~
           string []str =packages.Select(p => p.Company).ToArray();
            foreach(string s in str)
                Console.WriteLine(s);          
        }        
    }
}