Testing with IListView

Form1.cs

using System;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            string curDir = Directory.GetCurrentDirectory();
            webBrowser1.Navigate(curDir);
        }

        // add a button somewhere, the IListView cannot be retrieved too early (it will crash when calling any of its method)
        private void button1_Click(object sender, EventArgs e)
        {
            var view = GetIListView(FindWindowEx(webBrowser1.Handle, IntPtr.Zero, null, null));
            if (view != null)
            {
                view.SetBackgroundColor(Color.Black);
                //view.SetTextColor(Color.White);
                //view.SetTextBackgroundColor(Color.Black);

                for (int i = 0; i < view.GetItemCount(); i++)
                {
                    view.UpdateItem(i);
                }
            }
        }

        private static IListView GetIListView(IntPtr parent)
        {
            IListView view = null;
            EnumChildWindows(parent, (h, p) =>
            {
                SendMessage(h, LVM_QUERYINTERFACE, typeof(IListView).GUID, out IListView lv);
                if (lv == null)
                    return true;

                view = lv;
                return false;
            }, IntPtr.Zero);
            return view;
        }

        [DllImport("user32.dll")]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("user32.dll")]
        private static extern bool EnumChildWindows(IntPtr hwndParent, EnumWindowsProc lpEnumFunc, IntPtr lParam);

        [DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, [MarshalAs(UnmanagedType.LPStruct)] Guid wParam, out IListView lParam);

        private delegate bool EnumWindowsProc(IntPtr hwnd, IntPtr lParam);
        private const int LVM_QUERYINTERFACE = 0x10BD;

        [Guid("e5b16af2-3990-4681-a609-1f060cd14269"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface IListView
        {
            // IOleWindow
            void GetWindow();
            void ContextSensitiveHelp();

            // IListView
            void GetImageList();
            void SetImageList();

            Color GetBackgroundColor();
            void SetBackgroundColor(Color color);
            Color GetTextColor();
            void SetTextColor(Color color);
            Color GetTextBackgroundColor();
            void SetTextBackgroundColor(Color color);
            Color GetHotLightColor();
            void SetHotLightColor(Color color);
            int GetItemCount();
            // unused
            void SetItemCount();
            void GetItem();
            void SetItem();
            void GetItemState();
            void SetItemState();
            void GetItemText();
            void SetItemText();
            void GetBackgroundImage();
            void SetBackgroundImage();
            void GetFocusedColumn();
            void SetSelectionFlags();
            void GetSelectedColumn();
            void SetSelectedColumn();
            void GetView();
            void SetView();
            void InsertItem();
            void DeleteItem();
            void DeleteAllItems();

            void UpdateItem(int index);
        }
    }
}