1.须要引用的dll :  DocumentFormat.OpenXml.dll  ---须要安装一下OpenXml再引用

                             WindowsBase  ---直接在项目里加入引用

2.方法：

/// 
        /// 读取.xlsx格式的Excel文件数据，读取其特定名称的工作薄        /// 
        /// 文件路径 如 D:\\excel1.xls        /// 工作薄名称 如 Sheet1        /// 要转化成的DataTable的列名数组        /// 
             public static DataTable ReadExcelToDataTable(Stream fileStream, string sheetName, string[] fieldNames)        {              using (var document = SpreadsheetDocument.Open(fileStream, false))            {                var sheets = document.WorkbookPart.Workbook.Descendants
     
      ().Where(p => p.Name == sheetName);                var enumerable = sheets as Sheet[] ??
     

sheets.ToArray(); if (!enumerable.Any()) { return null; } var wsp = (WorksheetPart)document.WorkbookPart.GetPartById(enumerable.First().Id); //获取Excel中共享数据 var stringTable = document.WorkbookPart.SharedStringTablePart.SharedStringTable; var rows = wsp.Worksheet.Descendants<Row>();//获得Excel中得数据行 DataTable table = new DataTable(); foreach (var name in fieldNames) { table.Columns.Add(name, typeof(string)); } //由于需要将数据导入到DataTable中,所以我们假定Excel的第一行是列名,从第二行开端是行数据 var _count = 0; var enumerable1 = rows as Row[] ?? rows.ToArray(); var total = enumerable1.Count() - 1; foreach (var row in enumerable1) { if (row.RowIndex > 1) { _count++; GetDataRow(row, stringTable, ref table, fieldNames); //Excel第二行同一时候为DataTable的第一行数据 if (_count % 100 != 0) continue; var per = (100 * _count / total - 5) <= 0 ? 1 : (100 * _count / total - 5); var perS = per.ToString(CultureInfo.InvariantCulture) + "%"; HttpContext.Current.Response.Write("<script>top.process('" + perS + "');</script>"); HttpContext.Current.Response.Flush(); } } return table; } } /// 获取Excel行数据 private static void GetDataRow(IEnumerable<OpenXmlElement> row, OpenXmlElement stringTable, ref DataTable table, string[] fieldNames) { if (stringTable == null) throw new ArgumentNullException("stringTable"); var dic = new Dictionary<int, string>(); var i = 0; foreach (Cell cell in row) { GetValue(i, cell, stringTable, ref dic); i++; } if (dic.Count == 0) { return; } var dr = table.NewRow(); int index = 0; foreach (var name in fieldNames) { dr[name] = dic[index]; index++; } table.Rows.Add(dr); } /// 获取Excel单元格数据 private static void GetValue(int i, CellType cell, OpenXmlElement stringTable, ref Dictionary<int, string> dic) { if (stringTable == null) throw new ArgumentNullException("stringTable"); //由于Excel的数据存储在SharedStringTable中,需要获取数据在SharedStringTable 中的索引 var value = string.Empty; try { if (cell.ChildElements.Count == 0) return; value = cell.CellValue.InnerText; if ((cell.DataType != null) && (cell.DataType == CellValues.SharedString)) { value = stringTable.ChildElements[Int32.Parse(value)].InnerText; } dic.Add(i, value); } catch (Exception) { } }