public static void CreateExcelFile(string FileName, List<UUser> luu) { if (FileName.Split('.')[FileName.Split('.').Length - 1] == "xlsx")//如果是2007版以后 { //create object Nothing = System.Reflection.Missing.Value; var app = new Excel.Application(); app.Visible = false; Excel.Workbook workBook = app.Workbooks.Add(Nothing); Excel.Worksheet worksheet = (Excel.Worksheet)workBook.Sheets[1]; worksheet.Name = "Sheet1"; //headline int i = 1; foreach (UUser uu in luu) { worksheet.Cells[1, i] = uu.name; i++; } worksheet.SaveAs(FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing); workBook.Close(false, Type.Missing, Type.Missing); app.Quit(); } else { HSSFWorkbook wk = new HSSFWorkbook(); //创建一个名称为mySheet的表 ISheet tb = wk.CreateSheet("Sheet1"); //创建一行，此行为第二行 IRow row = tb.CreateRow(1); for (int i = 0; i < luu.Count; i++) { ICell cell = row.CreateCell(i); //在第二行中创建单元格 cell.SetCellValue(luu[i].name);//循环往第二行的单元格中添加数据 } using (FileStream fs = File.OpenWrite(FileName)) { wk.Write(fs); //向打开的这个xls文件中写入mySheet表并保存。 } } } }
using Excel = Microsoft.Office.Interop.Excel;
using NExcel;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
需要这些引用 dll网上都可以下载
/// 将excel中的数据导入到DataTable中 /// </summary> /// <param name="sheetName">excel工作薄sheet的名称</param> /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param> /// <returns>返回的DataTable</returns> public static DataTable ExcelToDataTable(string name, string sheetName, bool isFirstRowColumn)//name 是excel的地址 { List<string> ls = new List<string>(); string sss = null; IWorkbook workbook = null; string fileName = name; ISheet sheet = null; DataTable data = new DataTable(); int startRow = 0; try { FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(fs); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(fs); if (sheetName != null) { //sheet = workbook.GetSheetAt(0); sheet = workbook.GetSheet(sheetName); } else { sheet = workbook.GetSheetAt(0); } if (sheet != null) { IRow firstRow = sheet.GetRow(0); int cellCount = firstRow.Cells.Count; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn) { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue.Replace("\n", "").Replace(" ","").Replace("\t","").Replace("\r","")); data.Columns.Add(column); } startRow = sheet.FirstRowNum + 1; } else { startRow = sheet.FirstRowNum; } //最后一列的标号 int rowCount = sheet.LastRowNum; for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; //没有数据的行默认是null DataRow dataRow = data.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null { switch (row.GetCell(j).CellType) { case NPOI.SS.UserModel.CellType.Blank: //空数据类型处理 dataRow[j] = ""; break; case NPOI.SS.UserModel.CellType.String: //字符串类型 dataRow[j] = "'" + row.GetCell(j).StringCellValue; break; case NPOI.SS.UserModel.CellType.Numeric: //数字类型 if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j))) { dataRow[j] ="'"+row.GetCell(j).DateCellValue.ToShortDateString().Split(' ')[0]; } else { if (row.GetCell(j).NumericCellValue.ToString().IndexOf(".") < 0) dataRow[j] = row.GetCell(j).NumericCellValue; else { dataRow[j] =Convert.ToDouble( getstr( row.GetCell(j).NumericCellValue.ToString())); } } break; case NPOI.SS.UserModel.CellType.Formula: if (fileName.IndexOf(".xlsx") < 0) { HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(workbook); dataRow[j] = e.Evaluate(row.GetCell(j)).StringValue; } else { XSSFFormulaEvaluator e = new XSSFFormulaEvaluator(workbook); dataRow[j] = e.Evaluate(row.GetCell(j)).StringValue; } break; default: row.GetCell(j).SetCellType(NPOI.SS.UserModel.CellType.String); dataRow[j] = row.GetCell(j).StringCellValue; break; } } } data.Rows.Add(dataRow); } } fs.Close(); return data; } catch (Exception ex) { // MessageBox.Show("err："+ex.Message); return new DataTable(); } }
public static void DataTableToExcel(DataTable dt, Excel.Worksheet excelSheet,ProgressBar s,List<UUser> luu) { s.Maximum = dt.Rows.Count * luu.Count; s.Value = 0; s.Visible = true; int rowCount = dt.Rows.Count ; int colCount =luu.Count; object[,] dataArray = new object[rowCount+1, colCount]; for (int k = 0; k < luu.Count; k++) { string str= luu[k].name; dataArray[0, k] = str; } for (int i = 0; i < rowCount; i++) { for (int j = 0; j < luu.Count; j++) { dataArray[i + 1, j] =dt.Rows[i][luu[j].source]; Application.DoEvents(); s.Value = s.Value + 1; } } excelSheet.Range["A1", excelSheet.Cells[rowCount+1, colCount]].Value2 = dataArray; s.Visible = false; s.Value = 0; }
这个uuser 有两个字段 Name 和 Source
name 是写入到新excel的列名
source 是datatable里的列名
这个是一个excel转换的流程
如果只是读取和写入直接去掉list<uuser>即可
