文件加载和添加到列表

我基本上试图将项目从。txt文件添加到listbox。问题是加载.txt文件的方法是在一个单独的类中，所以我到了一个点，我不知道该怎么做。任何帮助都将非常感激。下面是这个类，带有文件加载方法:

public class BunchOfDeliverables
{
    private List<Person> myPersons;
    private List<Deliverable> myDeliverables;
    public BunchOfDeliverables()
    {
        this.myPersons = new List<Person>();
        this.myDeliverables = new List<Deliverable>();
    }
    public List<Person> Persons { get { return this.myPersons; } }
    public List<Deliverable> Deliverables { get { return this.myDeliverables; } }
    public void LoadPersonsFromFile(String filename)
    {
        StreamReader sr = null;
        try
        {
            sr = new StreamReader(new FileStream(filename, FileMode.Open, FileAccess.Read));
            String name, street, housenr, postalcode, city;
            name = sr.ReadLine();
            while (name != null)
            {
                street = sr.ReadLine();
                housenr = sr.ReadLine();
                postalcode = sr.ReadLine();
                city = sr.ReadLine();
                this.myPersons.Add(new Person(name, street, Convert.ToInt32(housenr), postalcode, city));
                name = sr.ReadLine();
                name = sr.ReadLine(); //and again read a line, because of the delimiter (line with the stars)
            }
        }
        catch (IOException) { }
        finally
        {
            if (sr != null) sr.Close();
        }
    }
    public void LoadDeliverablesFromFile(String filename)
    {
        StreamReader sr = null;
        try
        {
            sr = new StreamReader(new FileStream(filename, FileMode.Open, FileAccess.Read));
            String s;
            s = sr.ReadLine();
            while (s != null)
            {
                String[] items = s.Split();
                this.myDeliverables.Add(new Deliverable(Convert.ToInt32(items[0]), Convert.ToInt32(items[1]), this.myPersons[Convert.ToInt32(items[2])]));
                s = sr.ReadLine();
            }
        }
        catch (IOException) { }
        finally
        {
            if (sr != null) sr.Close();
        }
    }

    public void AddPerson(Person p)
    {
        this.myPersons.Add(p);
    }

    public Deliverable FindDeliverable(int id)
    {
        foreach (Deliverable d in this.myDeliverables)
        {
            if (d.ID == id)
            {
                return d;
            }
        }
        return null;
    }
    public void AddDeliverable(Deliverable d)
    {
        if (FindDeliverable(d.ID) == null)
        {
            myDeliverables.Add(d);
        }
        else
        {
            throw new Exception("Be aware: nothing is added!!!");
        }
    }

然后这里是表单类(大部分为空):

public partial class Form1 : Form
{
    BunchOfDeliverables d;
    public Form1()
    {
        InitializeComponent();
        d = new BunchOfDeliverables();
    }
    private void AddLoadedFilesToListbox_Click(object sender, EventArgs e)
    {

    }

Edit : 

我尝试了以下操作，但仍然不起作用:

public partial class Form1: Form{BunchOfDeliverables d;公共Form1 (){InitializeComponent ();d = new bunchof可交付成果();d.LoadDeliverablesFromFile(". .数据/deliverables.txt");}

    private void button1_Click(object sender, EventArgs e)
    {
        foreach (Deliverable deliv in d.Deliverables)
        {
            listBox1.Items.Add(deliv);
        }
    }
    private void Form1_Load(object sender, EventArgs e)
    {
    }
}

BunchOfDeliverables bunchOfDeliverables = new BunchOfDeliverables();
bunchOfDeliverables.LoadPersonsFromFile(personsFile);
bunchOfDeliverables.LoadDeliverablesFromFile(deliverablesFile);
listBox.DataSource = bunchOfDeliverables.Persons;
listBox.DisplayMember = "<Whatever>";
listBox.ValueMember = "<Whatever>";
// OR
listBox.DataSource = bunchOfDeliverables.Deliverables;
listBox.DisplayMember = "<Whatever>";
listBox.ValueMember = "<Whatever>";