NET npoi 保存文件
npoi完整代码:NET npoi帮助类
public static void DataTableToExcel(List<DataTable> dataTables, string filePath) { if (dataTables == null || !dataTables.Any()) throw new Exception("dataTables不能为null"); bool isOldThan2007 = Path.GetExtension(filePath)?.ToLower() == ".xls"; IWorkbook book = dataTables.ToWorkbook(isOldThan2007); // FileStream using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write)) { book.Write(fs); } // MemoryStream MemoryStream ms = new MemoryStream(); book.Write(ms); saveTofle(ms, filePath); }
获得workbook
public static IWorkbook ToWorkbook(this List<DataTable> dataTables, bool isOldThan2007) { IWorkbook book = isOldThan2007 ? new HSSFWorkbook() : (IWorkbook)new XSSFWorkbook(); foreach (var dataTable in dataTables) { if (dataTable == null) continue; ISheet sheet = book.CreateSheet(dataTable.TableName); IRow headerRow = sheet.CreateRow(0); foreach (DataColumn column in dataTable.Columns) { headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); } for (int i = 0; i < dataTable.Rows.Count; i++) { DataRow row = dataTable.Rows[i]; IRow dataRow = sheet.CreateRow(i + 1); for (int j = 0; j < dataTable.Columns.Count; j++) { dataRow.CreateCell(j).SetCellValue(row[j]?.ToString()); } } } return book; }
MemoryStream
private static void saveTofle(MemoryStream file, string filePath)// string fileName { //if (!Directory.Exists(filePath)) Directory.CreateDirectory(filePath); using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write)) { byte[] buffer = file.ToArray();//转化为byte格式存储 fs.Write(buffer, 0, buffer.Length); fs.Flush(); buffer = null; } }
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