private void button1_Click(object sender, EventArgs e)

        {

            FolderBrowserDialog dialog = new FolderBrowserDialog();

            dialog.Description = "请选择文件路径";

            string foldPath = "";

            if (dialog.ShowDialog() == DialogResult.OK)

               {

                    foldPath = dialog.SelectedPath + @"\";

              }

            textBox1.Text = foldPath;

            string filename = "";

            int hour = Convert.ToInt32(DateTime.Now.Hour.ToString()); //结果为0

            int min  = Convert.ToInt32(DateTime.Now.Minute.ToString()); //结果为0

            int time = hour *  + min;

            filename += DateTime.Now.ToString("yyyy-MM-dd");

            filename += "." + "xlsx";

            //创建表格的具体路径

            var file = @foldPath + filename;

            //如果存在此表格，进行删除操作

            if (File.Exists(file))

            {

                File.Delete(file);

            }

            using (var excel = new ExcelPackage(new FileInfo(file)))

            {

                //创建一个工作表

                var ws = excel.Workbook.Worksheets.Add("Sheet1");

                ws.Cells[, ].Value = DateTime.Now.ToShortTimeString().ToString();

                ws.Cells[, ].Value = time;

                //自动调整每一列的长宽高

                ws.Column().AutoFit();

                ws.Column().AutoFit();

                ws.Column().AutoFit();

                //保存表格信息

                excel.Save();

            }

        }