c# 弹窗保存文件

try
            {
                this.Cursor = Cursors.WaitCursor;
                SaveFileDialog sfdFile = new SaveFileDialog();
                string ExcelExt = cPublic.GetExcelVersion();
                sfdFile.Filter = "Excel文件(*" + ExcelExt + ")|*" + ExcelExt + "";
                sfdFile.FileName = "文件名" + DateTime.Now.ToString("yyyyMMdd") + ExcelExt;
                if (sfdFile.ShowDialog() == DialogResult.OK)
                {
                 // sfd.FileName 保存路径了
            }
            catch (Exception ex)
            {
                this.Cursor = Cursors.Default;
                Aukeys.MsgTool.ShowMessage(ex.Message);
            }