C#自定义保存路径

Random randomkey = new Random(); int key = randomkey.Next(1, 1000000); int timename = DateTime.Now.Millisecond; SaveFileDialog save = new SaveFileDialog(); save.InitialDirectory = "c:\\ "; save.RestoreDirectory = true; save.Filter = "jpg files (*.jpg)|*.jpg|png files (*.png)|*.png|bmp files (*.bmp)|*.bmp|gif files (*.gif)|*.gif "; save.FilterIndex = 1; save.Title = "保存"; save.FileName = Convert.ToString(key + timename); if (save.ShowDialog() == DialogResult.OK) { string str = this.txtdanganpic.Text.Substring(this.txtdanganpic.Text.Length - 4, 4); System.IO.File.Copy(this.txtdanganpic.Text, save.FileName); }