问题:

Possible Duplicate:
C# Force ListBox to update elements

Let's consider this small piece of code:

listbox.DataSource = base_items;
listbox.DisplayMember = "Name";
// ... a bit later in the program
base_items.Add(  new Base_Item("Unnamed")  );

From this point, how do I do to make the listbox update its items? The only way for me to see the update is to close the window and reload it again.

回答1:

Just remove and add databinding again. You can create method that can be used on first load and when new item was added:

    void BindData()
    {
        listBox.DataSource = null;
        listBox.DataSource = base_items;
        listbox.DisplayMember = "Name";
    }

So here is the code for adding new item and refreshing listbox:

    base_items.Add(new Base_Item("Unnamed"));
    BindData();

As mentioned in Marc G's answer.

C# Force ListBox to update elements

If you know that the list needs refreshing, simple update the DisplayMember of the listbox.

listbox.DisplayMember = "";
listbox.DisplayMember = "Name";