Excel을 데이터테이블로 가져오기

  /// <summary>

        /// Excel DataTable

        /// </summary>

        /// <param name="strFileName">  </param>

        /// <param name="isHead">   </param>

        /// <param name="iSheet"> Sheet</param>

        /// <param name="strErrorMessage">  </param>

        /// <param name="iRowsIndex">  Excel  </param>

        /// <returns></returns>

        public static System.Data.DataTable GetDataFromExcel( string strFileName, bool isHead, int iSheet,

           string strErrorMessage, int iRowsIndex)

        {

            if (!strFileName.ToUpper().EndsWith(".XLSX"))

            {

                strErrorMessage = " ， ！" ;

                return null ;

            }



            Microsoft.Office.Interop.Excel. Application appExcel = new Microsoft.Office.Interop.Excel.Application ();

            Microsoft.Office.Interop.Excel. Workbook workbookData;

            Microsoft.Office.Interop.Excel. Worksheet worksheetData;



            workbookData = appExcel.Workbooks.Open(strFileName, System.Reflection. Missing.Value, System.Reflection.Missing .Value, System.Reflection.Missing.Value, System.Reflection. Missing.Value, System.Reflection.Missing .Value,

                     System.Reflection. Missing.Value, System.Reflection.Missing .Value, System.Reflection.Missing .Value, System.Reflection.Missing.Value, System.Reflection. Missing.Value, System.Reflection.Missing .Value, System.Reflection.Missing.Value);



            worksheetData = (Microsoft.Office.Interop.Excel. Worksheet)workbookData.Sheets[iSheet];





            Microsoft.Office.Interop.Excel. Range xlRang = null ;

            int iRowCount = worksheetData.UsedRange.Cells.Rows.Count;

            int iParstedRow = 0, iCurrSize = 0;

            int iEachSize = 1000;   // each time you

            int iColumnAccount = worksheetData.UsedRange.Cells.Columns.Count;

            int iHead = iRowsIndex;



            if (isHead)

                iHead = iRowsIndex + 1;



            System.Data. DataTable dt = new System.Data.DataTable();

            for (int i = 1; i <= iColumnAccount; i++)

            {

                if (isHead)

                    dt.Columns.Add(appExcel.Cells[iRowsIndex, i].FormulaLocal);

                else

                    dt.Columns.Add( "Columns" + i.ToString());

            }





            object[,] objVal = new object[iEachSize, iColumnAccount];

            try

            {

                iCurrSize = iEachSize;

                while (iParstedRow < iRowCount)

                {

                    if ((iRowCount - iParstedRow) < iEachSize)

                        iCurrSize = iRowCount - iParstedRow;



                    xlRang = worksheetData.get_Range( "A" + ((int )(iParstedRow + iHead)).ToString(), ((char)('A' + iColumnAccount - 1)).ToString()

                        + ((( int)(iParstedRow + iCurrSize + 1)).ToString()));



                    objVal = ( object[,])xlRang.Value2;



                    int iLength = objVal.Length / iColumnAccount;



                    for (int i = 1; i < iLength; i++)

                    {

                        DataRow dr = dt.NewRow();

                        for (int j = 1; j <= iColumnAccount; j++)

                        {

                            if (objVal[i, j] != null )

                            {

                                dr[j - 1] = objVal[i, j].ToString();

                            }



                        }



                        dt.Rows.Add(dr);

                    }



                    iParstedRow = iParstedRow + iCurrSize;



                }

                System.Runtime.InteropServices. Marshal.ReleaseComObject(xlRang);

                xlRang = null;



            }

            catch (Exception ex)

            {

                appExcel.Quit();

                strErrorMessage = ex.Message;

                return null ;

            }



            appExcel.Quit();



            return dt;



        }