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sherlockforrest
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NPOI.md
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266
NPOI.md
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# NPOI
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```csharp
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internal class NPOIUtil
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{
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/// <summary>
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/// DataTable导出到Excel文件
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/// </summary>
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/// <param name="dtSource">源DataTable</param>
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/// <param name="strHeaderText">表头文本</param>
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/// <param name="strFileName">保存位置</param>
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public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
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{
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using (MemoryStream ms = Export(dtSource, strHeaderText))
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{
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using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
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{
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byte[] data = ms.ToArray();
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fs.Write(data, 0, data.Length);
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fs.Flush();
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}
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}
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}
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/// <summary>
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/// DataTable导出到Excel的MemoryStream
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/// </summary>
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/// <param name="dtSource">源DataTable</param>
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/// <param name="strHeaderText">表头文本</param>
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/// <returns>The <see cref="MemoryStream"/></returns>
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public static MemoryStream Export(DataTable dtSource, string strHeaderText)
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{
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HSSFWorkbook workbook = new HSSFWorkbook();
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ISheet sheet = workbook.CreateSheet();
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ICellStyle dateStyle = workbook.CreateCellStyle();
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IDataFormat format = workbook.CreateDataFormat();
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dateStyle.DataFormat = format.GetFormat("yyyy-MM-dd");
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int[] arrColWidth = new int[dtSource.Columns.Count];
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foreach (DataColumn item in dtSource.Columns)
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{
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//GBK对应的code page是CP936
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arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
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}
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for (int i = 0; i < dtSource.Rows.Count; i++)
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{
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for (int j = 0; j < dtSource.Columns.Count; j++)
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{
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int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
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if (intTemp > arrColWidth[j])
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{
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arrColWidth[j] = intTemp;
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}
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}
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}
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int rowIndex = 0;
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foreach (DataRow row in dtSource.Rows)
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{
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if (rowIndex == 65535 || rowIndex == 0)
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{
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if (rowIndex != 0)
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{
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sheet = workbook.CreateSheet();
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}
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{
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IRow headerRow = sheet.CreateRow(0);
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headerRow.HeightInPoints = 25;
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headerRow.CreateCell(0).SetCellValue(strHeaderText);
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ICellStyle headStyle = workbook.CreateCellStyle();
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headStyle.Alignment = HorizontalAlignment.Center;
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IFont font = workbook.CreateFont();
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font.FontHeightInPoints = 20;
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font.IsBold = true;
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headStyle.SetFont(font);
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headerRow.GetCell(0).CellStyle = headStyle;
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sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
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}
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{
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IRow headerRow = sheet.CreateRow(1);
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ICellStyle headStyle = workbook.CreateCellStyle();
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headStyle.Alignment = HorizontalAlignment.Center;
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IFont font = workbook.CreateFont();
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font.FontHeightInPoints = 10;
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font.IsBold = true;
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headStyle.SetFont(font);
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foreach (DataColumn column in dtSource.Columns)
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{
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headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
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headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
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//设置列宽
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sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
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}
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}
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rowIndex = 2;
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}
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ICellStyle contentStyle = workbook.CreateCellStyle();
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contentStyle.Alignment = HorizontalAlignment.Left;
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IRow dataRow = sheet.CreateRow(rowIndex);
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foreach (DataColumn column in dtSource.Columns)
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{
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ICell newCell = dataRow.CreateCell(column.Ordinal);
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newCell.CellStyle = contentStyle;
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string drValue = row[column].ToString();
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switch (column.DataType.ToString())
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{
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case "System.String"://字符串类型
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newCell.SetCellValue(drValue);
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break;
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case "System.DateTime"://日期类型
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DateTime dateV;
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DateTime.TryParse(drValue, out dateV);
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newCell.SetCellValue(dateV);
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newCell.CellStyle = dateStyle;//格式化显示
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break;
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case "System.Boolean"://布尔型
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bool boolV = false;
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bool.TryParse(drValue, out boolV);
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newCell.SetCellValue(boolV);
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break;
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case "System.Int16"://整型
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case "System.Int32":
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case "System.Int64":
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case "System.Byte":
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int intV = 0;
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int.TryParse(drValue, out intV);
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newCell.SetCellValue(intV);
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break;
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case "System.Decimal"://浮点型
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case "System.Double":
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double doubV = 0;
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double.TryParse(drValue, out doubV);
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newCell.SetCellValue(doubV);
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break;
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case "System.DBNull"://空值处理
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newCell.SetCellValue("");
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break;
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default:
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newCell.SetCellValue("");
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break;
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}
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}
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rowIndex++;
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}
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using (MemoryStream ms = new MemoryStream())
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{
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workbook.Write(ms);
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ms.Flush();
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ms.Position = 0;
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//sheet.Dispose();
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//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
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return ms;
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}
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}
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/// <summary>
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/// 默认第一行为标头
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/// </summary>
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/// <param name="strFileName">excel文档路径</param>
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/// <returns></returns>
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public static DataTable Import(string strFileName)
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{
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DataTable dt = new DataTable();
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HSSFWorkbook hssfworkbook;
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using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
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{
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hssfworkbook = new HSSFWorkbook(file);
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}
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ISheet sheet = hssfworkbook.GetSheetAt(0);
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System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
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IRow headerRow = sheet.GetRow(0);
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int cellCount = headerRow.LastCellNum;
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for (int j = 0; j < cellCount; j++)
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{
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ICell cell = headerRow.GetCell(j);
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dt.Columns.Add(cell.ToString());
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}
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for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
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{
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IRow row = sheet.GetRow(i);
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DataRow dataRow = dt.NewRow();
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for (int j = row.FirstCellNum; j < cellCount; j++)
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{
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if (row.GetCell(j) != null)
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dataRow[j] = row.GetCell(j).ToString();
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}
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dt.Rows.Add(dataRow);
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}
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return dt;
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}
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/// <summary>
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///TableToExcel
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/// </summary>
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/// <param name="dt">The dt<see cref="DataTable"/></param>
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/// <param name="file">The file<see cref="string"/></param>
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private static void TableToExcel(DataTable dt, string file)
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{
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IWorkbook workbook;
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string fileExt = Path.GetExtension(file).ToLower();
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if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }
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if (workbook == null) { return; }
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ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("项目基点信息") : workbook.CreateSheet(dt.TableName);
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//表头
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IRow row = sheet.CreateRow(0);
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for (int i = 0; i < dt.Columns.Count; i++)
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{
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ICell cell = row.CreateCell(i);
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cell.SetCellValue(dt.Columns[i].ColumnName);
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}
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//数据
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for (int i = 0; i < dt.Rows.Count; i++)
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{
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IRow row1 = sheet.CreateRow(i + 1);
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for (int j = 0; j < dt.Columns.Count; j++)
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{
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ICell cell = row1.CreateCell(j);
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cell.SetCellValue(dt.Rows[i][j].ToString());
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}
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}
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//转为字节数组
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MemoryStream stream = new MemoryStream();
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workbook.Write(stream);
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var buf = stream.ToArray();
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//保存为Excel文件
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using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
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{
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fs.Write(buf, 0, buf.Length);
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fs.Flush();
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}
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}
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}
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```
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