How can I make a ListView update after each item i

Question

I am trying to use a ListView to make a realtime log output to a windows form.

This is the dummy code:

 public Form1()
    {
        InitializeComponent();
        listView1.View = View.Details;
        listView1.GridLines = false;
        listView1.Scrollable = true;

        listView1.FullRowSelect = true;
        listView1.Columns.Add("Track");
        listView1.Columns.Add("Status");

        for (int i = 1; i <= 10000; i++)
        {
            ListViewItem LVI = new ListViewItem("Track " + i);
            LVI.SubItems.Add("Updated");
            listView1.Items.Add(LVI);
            listView1.TopItem = LVI;
            listView1.EnsureVisible(listView1.Items.Count - 1);
        }
    }

How can I set it so it refreshes after each line is added? At the moment the application waits until the list is generated and then loads the form with the complete list.

Answer 1

Refresh won't work as that will only update what was already in the listview, not the added items.

Perhaps you should look at this:

Listview items not showing

Answer 2

You can fill data items in another thread (for example using task):

Application.DoEvents() ... processes all window messages and redraws component.

 public Form1()
        {
            InitializeComponent();
            listView1.View = View.Details;
            listView1.GridLines = false;
            listView1.Scrollable = true;

            listView1.FullRowSelect = true;
            listView1.Columns.Add("Track");
            listView1.Columns.Add("Status");

            Task t = new Task(new Action(() =>
                {
                    RefreshLines();
                }));
            t.Start();
        }

        public void RefreshLines()
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new MethodInvoker(this.RefreshLines));
            }
            for (int i = 1; i <= 10000; i++)
            {
                ListViewItem LVI = new ListViewItem("Track " + i);
                LVI.SubItems.Add("Updated");
                listView1.Items.Add(LVI);
                listView1.TopItem = LVI;
                listView1.EnsureVisible(listView1.Items.Count - 1);
                Application.DoEvents();
            }
        }

You can call this.Refresh(); instead of Application.DoEvents();

Answer 3

You can call this.Invalidate() or this.Refresh() on the form to update it.