.net利用npoi讀取本地文件excel文件

直接擼代碼

#region 上傳文件
                if (FileUpload1.HasFile)
                FileUpload1.SaveAs(Server.MapPath("~/") + FileUpload1.FileName);
                else
                {
                    ScriptManager.RegisterClientScriptBlock(this, GetType(), "aaa", "alert('上傳文件不存在');", true);
                }
                #endregion
                #region 讀取文件

                DataTable dt=null;
                string fileEx = FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf(".") + 1);
                if (fileEx == "xls")
                {
                    dt = IO.ImportExcelFile(Server.MapPath("~/") + FileUpload1.FileName);
                }
                else if (fileEx == "xlsx")
                {
                    dt = IO.ImportExcelFilexlsx(Server.MapPath("~/") + FileUpload1.FileName);
                }
                if (dt.Rows.Count < 1)
                {
                    ScriptManager.RegisterClientScriptBlock(this, GetType(), "aaa", "alert('上傳文件爲空，請檢查文件');", true);
                    return;
                }
                #endregion

IO.cs

public static DataTable ImportExcelFile(string filePath)
        {
            HSSFWorkbook hssfworkbook;
            #region//初始化信息
            try
            {
                using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    hssfworkbook = new HSSFWorkbook(file);
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            #endregion

            NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
            DataTable dt = new DataTable();
            for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
            {
                dt.Columns.Add(sheet.GetRow(0).GetCell(j).ToString());
            }
            //sheet.cu

            while (rows.MoveNext())
            {

                HSSFRow row = (HSSFRow)rows.Current;
                if (row.RowNum != 0)
                {
                    DataRow dr = dt.NewRow();
                    for (int i = 0; i < row.LastCellNum; i++)
                    {
                        NPOI.SS.UserModel.ICell cell = row.GetCell(i);
                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            dr[i] = cell.ToString();
                        }
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;
        }
        public static DataTable ImportExcelFilexlsx(string filePath)
        {
            XSSFWorkbook hssfworkbook;
            #region//初始化信息
            try
            {
                using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    hssfworkbook = new XSSFWorkbook(file);
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            #endregion

            NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
            DataTable dt = new DataTable();
            for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
            {
                dt.Columns.Add(sheet.GetRow(0).GetCell(j).ToString());
            }
            //sheet.cu

            while (rows.MoveNext())
            {

                XSSFRow row = (XSSFRow)rows.Current;
                if (row.RowNum != 0)
                {
                    DataRow dr = dt.NewRow();
                    for (int i = 0; i < row.LastCellNum; i++)
                    {
                        NPOI.SS.UserModel.ICell cell = row.GetCell(i);
                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            dr[i] = cell.ToString();
                        }
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;
        }