C# 可视化读取文件

OpenFileDialog fd = new OpenFileDialog();
            fd.Filter = "txt files (*.txt)|*.txt|All files(*.*)|*.*";
            fd.InitialDirectory = Application.StartupPath + "\\Temp\\";
            fd.ShowReadOnly = true;
            DialogResult r = fd.ShowDialog();
            if(r == DialogResult.OK)
            {
                string all = fd.FileName;
                string path = all.Substring(0, all.LastIndexOf("\\") + 1);
                string fileName = all.Substring(all.LastIndexOf("\\") + 1, all.LastIndexOf(".") - (all.LastIndexOf("\\") + 1));
                string fileExc = all.Substring(all.LastIndexOf(".") + 1, all.Length - all.LastIndexOf(".") - 1);

                System.Console.WriteLine("all = {0}", all);
                System.Console.WriteLine("path = {0}" ,path);
                System.Console.WriteLine("fileName = {0}", fileName);
                System.Console.WriteLine("fileExc = {0}",fileExc);
            }