/// <summary>
        /// DataGridView導出Excel
        /// </summary>
        /// <param name="strCaption">Excel文件中的標題</param>
        /// <param name="myDGV">DataGridView 控件</param>
        /// <returns>0:成功;1:DataGridView中無記錄;2:Excel無法啟動;9999:異常錯誤</returns>
        private int ExportExcel(string strCaption, DataGridView myDGV)
        {
            int result = 9999;
            // 列索引，行索引，總列數，總行數
            int ColIndex = 0;
            int RowIndex = 0;
            int ColCount = myDGV.ColumnCount;
            int RowCount = myDGV.RowCount;

            if (myDGV.RowCount == 0)
            {
                result = 1;
            }

            // 創建Excel對象
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            if (xlApp == null)
            {
                result = 2;
            }
            try
            {
                // 創建Excel工作薄
                Microsoft.Office.Interop.Excel.Workbook xlBook = xlApp.Workbooks.Add(true);
                Microsoft.Office.Interop.Excel.Worksheet xlSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.Worksheets[1];
                // 設置標題
                Microsoft.Office.Interop.Excel.Range range = xlSheet.get_Range(xlApp.Cells[1, 1], xlApp.Cells[1, ColCount]); //標題所占的單元格數與DataGridView中的列數相同
                range.MergeCells = true;
                xlApp.ActiveCell.FormulaR1C1 = strCaption;
                xlApp.ActiveCell.Font.Size = 20;
                xlApp.ActiveCell.Font.Bold = true;
                xlApp.ActiveCell.HorizontalAlignment = Microsoft.Office.Interop.Excel.Constants.xlCenter;
                // 創建緩存數據
                object[,] objData = new object[RowCount + 1, ColCount];
                //獲取列標題
                foreach (DataGridViewColumn col in myDGV.Columns)
                {
                    objData[RowIndex, ColIndex++] = col.HeaderText;
                }
                // 獲取數據
                for (RowIndex = 1; RowIndex < RowCount; RowIndex++)
                {
                    for (ColIndex = 0; ColIndex < ColCount; ColIndex++)
                    {
                        if (myDGV[ColIndex, RowIndex - 1].ValueType == typeof(string) 
                            || myDGV[ColIndex, RowIndex - 1].ValueType == typeof(DateTime))//這里就是驗證DataGridView單元格中的類型,如果是string或是DataTime類型,則在放入緩存時在該內容前加入" ";
                        {
                            objData[RowIndex, ColIndex] = "" + myDGV[ColIndex, RowIndex - 1].Value;
                        }
                        else
                        {
                            objData[RowIndex, ColIndex] = myDGV[ColIndex, RowIndex - 1].Value;
                        }
                    }
                    System.Windows.Forms.Application.DoEvents();
                }
                // 寫入Excel
                range = xlSheet.get_Range(xlApp.Cells[2, 1], xlApp.Cells[RowCount, ColCount]);
                range.Value2 = objData;

                //保存
                xlBook.Saved = true;
                xlBook.SaveCopyAs("C://測試" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");
                //返回值
                result = 0;
            }
            catch (Exception err)
            {
                result = 9999;
            }
            finally
            {
                xlApp.Quit();
                GC.Collect(); //強制回收
            }
            return result;
        } 

        private void button4_Click(object sender, EventArgs e)
        {           
            int result = this.ExportExcel("測試", this.dataGridView1); //this.dataGridView1:DataGridView控件
            MessageBox.Show(result.ToString());
        }