实例功能概述:
1、支持Excel2003以及2007
2、支持Excel读取到DataTable(TableToExcel)
3、支持DataTable导出到Excel(TableToExcel)
4、支持WPF DataGrid导出到Excel(SelectedRowToExcel,AllRowToExcel)
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Data; using Microsoft.Win32; using Microsoft.Windows.Controls; using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; namespace LT.Utility { /// <summary> /// FileName: NpoiExcelHelper.cs /// CLRVersion: 4.0.30319.18052 /// Author: ZhangLei /// Corporation: Litu /// Description:Npoi Excel操作类封装 /// DateTime: 2016/1/24 23:01:21 /// </summary> public class NpoiExcelHelper { #region Public Interface /// <summary> /// 读取Excel到DataTable<see cref="System.Data.DataTable"/> /// </summary> /// <param name="file">Excel路径,如"E:\hello.xls"</param> /// <returns></returns> public static DataTable ExcelToTable(string file) { var type = GetFileType(file); if ( type== FileType.Excel2003) { return ExcelToTableForXLS(file); } else if (type == FileType.Excel2007) { return ExcelToTableForXLSX(file); } else { return null; } } /// <summary> /// DataTable 导出到 Excel /// </summary> /// <param name="dt"></param> public static void TableToExcel(DataTable dt) { SaveFileDialog saveFileDialog = new SaveFileDialog(); saveFileDialog.Filter = "Excel 2003(*.xls)|*.xls|Excel 2007(*.xlsx)|*.xlsx"; saveFileDialog.FilterIndex = 1; if (saveFileDialog.ShowDialog() == true) { if (saveFileDialog.FilterIndex == 1) { TableToExcelForXLS(dt,saveFileDialog.FileName); } else { TableToExcelForXLSX(dt, saveFileDialog.FileName); } } } /// <summary> /// DataTable 导出到 Excel /// </summary> /// <param name="dt"></param> /// <param name="file">Excel路径,如"E:\hello.xls"</param> public static void TableToExecel(DataTable dt, string file) { var type = GetFileType(file); if (type == FileType.Excel2003) { TableToExcelForXLS(dt, file); } else if (type == FileType.Excel2007) { TableToExcelForXLSX(dt, file); } else { throw new Exception("暂不支持此种文件类型的输出"); } } /// <summary> /// WPF DataGrid选中行数据导出到Excel /// </summary> /// <param name="dataGrid"></param> public static void SelectedRowToExcel(DataGrid dataGrid) { var dataView = dataGrid.ItemsSource as DataView; if (dataView != null) { DataTable dt = dataView.ToTable(); dt.Rows.Clear(); int sRowCount = dataGrid.SelectedItems.Count; int col = dataGrid.Columns.Count; var sItems = dataGrid.SelectedItems; DataRow newRow = null; DataRowView drv = null; for (int i = 0; i < sRowCount; i++) { newRow = dt.NewRow(); for (int j = 0; j < col; j++) { drv = sItems[i] as DataRowView; newRow[j] = drv[j]; } dt.Rows.Add(newRow); } TableToExcel(dt); } else { throw new Exception("DataGrid 数据源为null,无法导出到Excel"); } } /// <summary> /// WPF DataGrid全部数据导出到Excel /// </summary> /// <param name="dataGrid"></param> public static void AllRowToExcel(DataGrid dataGrid) { var dataView = dataGrid.ItemsSource as DataView; if (dataView != null) { DataTable dt = dataView.ToTable(); TableToExcel(dt); } else { throw new Exception("DataGrid 数据源为null,无法导出到Excel"); } } #endregion #region Common Function private static FileType GetFileType(string file) { string extention = Path.GetExtension(file).ToLower(); if(extention.Equals(".xls")) { return FileType.Excel2003; } else if (extention.Equals(".xlsx")) { return FileType.Excel2007; } else { return FileType.Other; } } enum FileType { Excel2003, Excel2007, Other } #endregion #region Excel2003 /// <summary> /// 将Excel文件中的数据读出到DataTable中(xls) /// </summary> /// <param name="file"></param> /// <returns></returns> private static DataTable ExcelToTableForXLS(string file) { DataTable dt = new DataTable(); using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)) { HSSFWorkbook hssfworkbook = new HSSFWorkbook(fs); ISheet sheet = hssfworkbook.GetSheetAt(0); //表头 IRow header = sheet.GetRow(sheet.FirstRowNum); List<int> columns = new List<int>(); for (int i = 0; i < header.LastCellNum; i++) { object obj = GetValueTypeForXLS(header.GetCell(i) as HSSFCell); if (obj == null || obj.ToString() == string.Empty) { dt.Columns.Add(new DataColumn("Columns" + i.ToString())); //continue; } else dt.Columns.Add(new DataColumn(obj.ToString())); columns.Add(i); } //数据 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++) { DataRow dr = dt.NewRow(); bool hasValue = false; foreach (int j in columns) { dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as HSSFCell); if (dr[j] != null && dr[j].ToString() != string.Empty) { hasValue = true; } } if (hasValue) { dt.Rows.Add(dr); } } } return dt; } /// <summary> /// 将DataTable数据导出到Excel文件中(xls) /// </summary> /// <param name="dt"></param> /// <param name="file"></param> private static void TableToExcelForXLS(DataTable dt, string file) { NPOI.HSSF.UserModel.HSSFWorkbook hssfworkbook = new NPOI.HSSF.UserModel.HSSFWorkbook(); ISheet sheet = hssfworkbook.CreateSheet("Test"); //表头 IRow row = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = row.CreateCell(i); cell.SetCellValue(dt.Columns[i].ColumnName); } //数据 for (int i = 0; i < dt.Rows.Count; i++) { IRow row1 = sheet.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { ICell cell = row1.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); } } //转为字节数组 MemoryStream stream = new MemoryStream(); hssfworkbook.Write(stream); var buf = stream.ToArray(); //保存为Excel文件 using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)) { fs.Write(buf, 0, buf.Length); fs.Flush(); } } /// <summary> /// 获取单元格类型(xls) /// </summary> /// <param name="cell"></param> /// <returns></returns> private static object GetValueTypeForXLS(HSSFCell cell) { if (cell == null) return null; switch (cell.CellType) { case CellType.Blank: //BLANK: return null; case CellType.Boolean: //BOOLEAN: return cell.BooleanCellValue; case CellType.Numeric: //NUMERIC: return cell.NumericCellValue; case CellType.String: //STRING: return cell.StringCellValue; case CellType.Error: //ERROR: return cell.ErrorCellValue; case CellType.Formula: //FORMULA: default: return "=" + cell.CellFormula; } } #endregion #region Excel2007及以上版本 /// <summary> /// 将Excel文件中的数据读出到DataTable中(xlsx) /// </summary> /// <param name="file"></param> /// <returns></returns> private static DataTable ExcelToTableForXLSX(string file) { DataTable dt = new DataTable(); using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)) { //NPOI.XSSF.UserModel XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs); ISheet sheet = xssfworkbook.GetSheetAt(0); //表头 IRow header = sheet.GetRow(sheet.FirstRowNum); List<int> columns = new List<int>(); for (int i = 0; i < header.LastCellNum; i++) { object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell); if (obj == null || obj.ToString() == string.Empty) { dt.Columns.Add(new DataColumn("Columns" + i.ToString())); //continue; } else dt.Columns.Add(new DataColumn(obj.ToString())); columns.Add(i); } //数据 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++) { DataRow dr = dt.NewRow(); bool hasValue = false; foreach (int j in columns) { dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell); if (dr[j] != null && dr[j].ToString() != string.Empty) { hasValue = true; } } if (hasValue) { dt.Rows.Add(dr); } } } return dt; } /// <summary> /// 将DataTable数据导出到Excel文件中(xlsx) /// </summary> /// <param name="dt"></param> /// <param name="file"></param> private static void TableToExcelForXLSX(DataTable dt, string file) { XSSFWorkbook xssfworkbook = new XSSFWorkbook(); ISheet sheet = xssfworkbook.CreateSheet("Test"); //表头 IRow row = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = row.CreateCell(i); cell.SetCellValue(dt.Columns[i].ColumnName); } //数据 for (int i = 0; i < dt.Rows.Count; i++) { IRow row1 = sheet.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { ICell cell = row1.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); } } //转为字节数组 MemoryStream stream = new MemoryStream(); xssfworkbook.Write(stream); var buf = stream.ToArray(); //保存为Excel文件 using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)) { fs.Write(buf, 0, buf.Length); fs.Flush(); } } /// <summary> /// 获取单元格类型(xlsx) /// </summary> /// <param name="cell"></param> /// <returns></returns> private static object GetValueTypeForXLSX(XSSFCell cell) { if (cell == null) return null; switch (cell.CellType) { case CellType.Blank: //BLANK: return null; case CellType.Boolean: //BOOLEAN: return cell.BooleanCellValue; case CellType.Numeric: //NUMERIC: return cell.NumericCellValue; case CellType.String: //STRING: return cell.StringCellValue; case CellType.Error: //ERROR: return cell.ErrorCellValue; case CellType.Formula: //FORMULA: default: return "=" + cell.CellFormula; } } #endregion } }
时间: 2024-10-12 11:52:00