很久沒寫文章了，主要是從java轉到c#,經歷坎坷一言難盡呀，但最重的一點，就是變懶了。希望你們不要學小編。。。咳咳。。好乾貨開始。

二、前端用form表單提交即可,js或jq觸發form提交即可

 <form class="form-horizontal" id="uploadForm" enctype="multipart/form-data" action="寫你自己的路徑" >
 <input type="file" id="fileUpload" name="fileUpload">
 </form>

三、後臺程式碼

using NPOI.SS.UserModel;        //NPOI
 

using NPOI.HSSF.Util;           //NPOI
using NPOI.HSSF.UserModel;      //NPOI
using NPOI.XSSF.UserModel;      //NPOI

 /// <summary>
        ///將Excel中第一個sheet中內容匯入到DataTable中
        /// 區分xsl和xslx分別處理
        /// </summary>
        /// <param name="filePath">Excel檔案路徑,含檔案全名</param>
        /// <param name="sheetName">
 
此Excel中sheet名</param>
        /// <returns></returns>

        public DataTable ReadExcelToDataTable()
        {
            HttpPostedFileBase File = Request.Files["fileUpload"];//<input type="file" name="fileUpload">中name對應獲取Excel檔案
            Stream streamfile = File.InputStream;//將檔案轉換成流
 

            DataTable dt = new DataTable();

            IWorkbook workbook = null;//建立一個工作薄來裝Excel表
            if (Path.GetExtension(File.FileName).ToLower() == ".xls".ToLower()) //filePath
            {//.xls
                #region .xls檔案處理:HSSFWorkbook

                workbook = new HSSFWorkbook(streamfile);
                ISheet sheet = workbook.GetSheetAt(0);  //獲取第一個工作表（sheet）
                System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
                HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);

                //一行最後一個方格的編號 即總的列數 
                for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
                {
                    //SET EVERY COLUMN NAME
                    HSSFCell cell = (HSSFCell)headerRow.GetCell(j);

                    dt.Columns.Add(cell.ToString());
                }

                while (rows.MoveNext())
                {
                    IRow row = (HSSFRow)rows.Current;
                    DataRow dr = dt.NewRow();

                    if (row.RowNum == 0) continue;//The firt row is title,no need import

                    for (int i = 0; i < row.LastCellNum; i++)
                    {
                        if (i >= dt.Columns.Count)//cell count>column count,then break //每條記錄的單元格數量不能大於表格欄位數量 20140213
                        {
                            break;
                        }

                        ICell cell = row.GetCell(i);

                        if ((i == 0) && (string.IsNullOrEmpty(cell.ToString()) == true))//每行第一個cell為空,break
                        {
                            break;
                        }

                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            //dr[i] = cell.ToString();
                              if (cell.CellType == CellType.NUMERIC && DateUtil.IsCellDateFormatted(cell))
                            { 
                               dr[i] = cell.DateCellValue.ToString("yyyy-MM-dd hh:mm:ss"); // //如果內容是時間格式轉成這種格式
                            }
                            else
                            {
                                dr[i] = row.GetCell(i).ToString();
                            }
                        }
                    }

                    dt.Rows.Add(dr);
                }
                #endregion
            }
            else
            {//.xlsx
                #region .xlsx檔案處理:XSSFWorkbook

                workbook = new XSSFWorkbook(streamfile);
                ISheet sheet = workbook.GetSheetAt(0);
                System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
                XSSFRow headerRow = (XSSFRow)sheet.GetRow(0);



                //一行最後一個方格的編號 即總的列數 
                for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
                {
                    //SET EVERY COLUMN NAME
                    XSSFCell cell = (XSSFCell)headerRow.GetCell(j);

                    dt.Columns.Add(cell.ToString());

                }

                while (rows.MoveNext())
                {
                    IRow row = (XSSFRow)rows.Current;
                    DataRow dr = dt.NewRow();

                    if (row.RowNum == 0) continue;//The firt row is title,no need import

                    for (int i = 0; i < row.LastCellNum; i++)
                    {
                        if (i >= dt.Columns.Count)//cell count>column count,then break //每條記錄的單元格數量不能大於表格欄位數量 20140213
                        {
                            break;
                        }

                        ICell cell = row.GetCell(i);

                        if ((i == 0) && (string.IsNullOrEmpty(cell.ToString()) == true))//每行第一個cell為空,break
                        {
                            break;
                        }

                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            //dr[i] = cell.ToString();
                               if (cell.CellType == CellType.NUMERIC && DateUtil.IsCellDateFormatted(cell))
                           {
                                dr[i] = cell.DateCellValue.ToString("yyyy-MM-dd hh:mm:ss"); //如果內容是時間格式轉成這種格式
                           } else
                            {
                                dr[i] = row.GetCell(i).ToString();
                            }
                        }
                    }
                    dt.Rows.Add(dr);
                }
                #endregion
            }
            return dt;
        }