c# - How can I make a ListView update after each item is added?

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

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();