ME3Explorer.KFreonTPFTools3.MainTreeView_DragDrop C# (CSharp) Method

        private void MainTreeView_DragDrop(object sender, DragEventArgs e)
        {
            List<string> DroppedFiles = new List<string>((string[])e.Data.GetData(DataFormats.FileDrop, false));
            List<string> ValidDrops = new List<string>();
            List<string> Invalids = new List<string>();

            // KFreon: Check valid files
            foreach (string file in DroppedFiles)
                switch (Path.GetExtension(file).ToLowerInvariant())
                {
                    case ".tpf":
                    case ".metpf":
                    case ".dds":
                    case ".def":
                    case ".txt":
                    case ".log":
                    case ".mod":
                    case ".tga":
                    case ".jpg":
                    case ".png":
                    case ".bmp":
                        ValidDrops.Add(file);
                        break;
                    default:
                        Invalids.Add(file);
                        break;
                }

            // KFreon: Notify if some are invalid
            if (Invalids.Count > 0)
                MessageBox.Show("The following files are not TPFTools things:" + Environment.NewLine + string.Join(Environment.NewLine, Invalids.ToArray()), "You have failed. We will find another.");

            BeginLoadingFiles(ValidDrops);
        }