列表框在数据源更改期间清除所有项目

Question

When I change the datasource of my Listbox all items are cleared, when loading new data into this Listbox it stays clear. I have another ListBox right new to this one with the same refresh code but that one refreshes perfectly.

    private void RefreshContacts()
    {
        this.ListContacts.DataSource = null; 
        this.ListContacts.DataSource = this.contacts;
        this.BoxCountContacts.Text = this.ListContacts.Items.Count.ToString();
    }

Anyone have an idea how to fix the listbox from being cleared and bugged?

Here is the full refresh codes of the two listboxes

    private Contact[] contacts, feed; private Boolean isFeed;

    internal ArcFeed()
    { 
        this.InitializeComponent();
        this.contacts = this.feed = new Contact[0]; 
    }
    private void RefreshForm(Boolean isFeed)
    { 
        if (isFeed)
        { 
            this.RefreshFeed();
        } 
        else 
        { 
            this.RefreshContacts();
        } 
    }
    private void RefreshContacts()
    {
        this.ListContacts.DataSource = null;         
        this.ListContacts.DataSource = this.contacts;
        this.BoxCountContacts.Text = this.ListContacts.Items.Count.ToString();
    }
    private void RefreshFeed()
    {
        this.ListFeed.DataSource = null; 
        this.ListFeed.DataSource = this.feed;
        this.BoxCountFeed.Text = this.ListFeed.Items.Count.ToString();
    }
    private void OpenFile()
    {
        if (this.isFeed)
        { 
            this.BoxFileFeed.Text = this.DialogOpen.FileName;
            this.feed = ArcBuzz.Load(this.DialogOpen.FileName);
        }
        else
        {
            this.BoxFileContacts.Text = this.DialogOpen.FileName;
            this.contacts = ArcBuzz.Load(this.DialogOpen.FileName); 
        }
        this.RefreshForm(this.isFeed);
    }

All code is debugged and follows it's course properly, I don't see any errors, the correct listbox's datasource are set and changed.

Answer 1

Just to make sure, have you checked that there are actually items in the contacts collection?

Also, if you've got two Listboxes, double check that you are using the right Listbox in each of the refresh code sections.

Sounds stupid, but its silly mistakes like this that get overlooked a lot of the time. With databinding its usually something small like this stopping it working.