if (saveFileDialog1.ShowDialog()==DialogResult.OK)
            {                this.textBox1.Text = this.saveFileDialog1.FileName.ToString();
                string a = this.textBox1.Text;
            }
这样子拿出来的a是:F:\\temp\\ff\\text.txt;我如果想a是:F:\temp\ff\text.txt要怎么写?