C#工具类----ExcelToDatatable

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本文链接： https://blog.csdn.net/weixin_43906877/article/details/100631657

利用了c#的第三方插件Nopi

  		/// <summary>
        /// 传入一个文件的地址，返回一个datatable的表
        /// </summary>
        /// <param name="filepath"></param>
        /// <returns>databel</returns>
        public DataTable XlsToDatatable(string filepath)
        {
            DataTable dt = new DataTable();
            using (var file = new FileStream(filepath, FileMode.Open, FileAccess.Read))
            {
                var hssfworkbook = new HSSFWorkbook(file);
                var sheet = hssfworkbook.GetSheetAt(0);
                //var row = (HSSFRow)rows.Current;
                //sheet.TopRow.

                var rows = sheet.GetRowEnumerator();
                HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);
                for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
                {
                    //SET EVERY COLUMN NAME
                    HSSFCell cell = (HSSFCell)headerRow.GetCell(j);

                    var keys = dic.Where(q => q.Value == cell.ToString()).Select(q => q.Key);
                    List<string> keyList = (from q in dic
                        where q.Value == cell.ToString()
                        select q.Key).ToList<string>(); //get all keys
                    if (keyList.Count!=0)
                    {
                        dt.Columns.Add(keyList[0]);
                    }
                    else
                    {
                        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 //每条记录的单元格数量不能大于表格栏位数量 20140213
                        {
                            break;
                        }

                        ICell cell = row.GetCell(i);

                        if ((i == 0) && (string.IsNullOrEmpty(cell.ToString()) == true))//每行第一个cell为空,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"); // //如果内容是时间格式转成这种格式
                            }
                            else
                            {
                                dr[i] = row.GetCell(i).ToString();
                            }
                        }
                    }
                    dt.Rows.Add(dr);
                }
                return dt;
            }
        }