需要的Dll:NPOI.OOXML.dll https://files.cnblogs.com/files/CityOfThousandFires/NPOI.dl.rar

 /// <summary>

        /// Excel->DataTable

        /// </summary>

        /// <param name="filePath">Excel檔案路徑</param>

        public static DataTable ReadExcel(string filePath)

        {

            IWorkbook iwkX;
 

            using (FileStream fs = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))

            {

                iwkX = WorkbookFactory.Create(fs);

                fs.Close();

            }

            //sheet

            DataTable dt = new DataTable();

            for (int h = 0; h < iwkX.NumberOfSheets; h++)
 

            {

                ISheet sheet = iwkX.GetSheetAt(h);

                var rows = sheet.GetRowEnumerator();

                bool isMove = rows.MoveNext();

                //迴圈sheet

                if (isMove)

                {

                    var Cols = (IRow)rows.Current;

                    dt.TableName = sheet.SheetName;
 

                    for (int i = 0; i < Cols.LastCellNum; i++)

                    {

                        string str = Cols.GetCell(i).ToString();

                        dt.Columns.Add(Cols.GetCell(i).ToString());

                    }

                    while (rows.MoveNext())

                    {

                        var row = (IRow)rows.Current;

                        var dr = dt.NewRow();

                        for (int i = 0; i < row.LastCellNum; i++)

                        {

                            var cell = row.GetCell(i);

                            if (cell == null)

                            {

                                dr[i] = "";

                            }

                            else

                            {

                                string strdr = cell.ToString();

                                dr[i] = cell.ToString();

                            }

                        }

                        dt.Rows.Add(dr);

                    }

                }

            }

            return dt;

        }