使用NPOI操作Excel(03、07)

  1 using System;

  2 using System.Collections.Generic;

  3 using System.Linq;

  4 using System.Text;

  5 using NPOI.SS.UserModel;

  6 using NPOI.XSSF.UserModel;

  7 using NPOI.HSSF.UserModel;

  8 using System.IO;

  9 using System.Data;

 10 using NPOI.SS.Util;

 11 

 12 namespace Common

 13 {

 14     public class ExcelHelper : IDisposable

 15     {

 16         private string fileName = null; //文件名

 17         private IWorkbook workbook = null;

 18         private FileStream fs = null;

 19         private bool disposed;

 20 

 21         public ExcelHelper(string fileName)

 22         {

 23             this.fileName = fileName;

 24             disposed = false;

 25         }

 26         /// <summary>

 27         /// 生成Sheet对象

 28         /// </summary>

 29         /// <param name="fileName">导出Excel文件完整文件名</param>

 30         /// <param name="sheetName">要导入的excel的sheet的名称</param>

 31         /// <returns></returns>

 32         public ISheet GenerateSheet(string sheetName)

 33         {

 34             ISheet sheet = null;

 35 

 36             fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);

 37             if (fileName.IndexOf(".xlsx") > 0) // 2007版本

 38                 workbook = new XSSFWorkbook();

 39             else if (fileName.IndexOf(".xls") > 0) // 2003版本

 40                 workbook = new HSSFWorkbook();

 41             if (workbook != null)

 42             {

 43                 sheet = workbook.CreateSheet(sheetName);

 44             }

 45             return sheet;

 46         }

 47         /// <summary>

 48         /// 将DataTable数据导入到excel中

 49         /// </summary>

 50         /// <param name="sheet">所要操作Excel的Sheet对象</param>

 51         /// <param name="data">要导入的数据</param>

 52         /// <param name="dataRowStart">数据起始行索引</param>

 53         /// <returns>导入数据行数(包含列名那一行)</returns>

 54         public int DataTableToExcel(ISheet sheet, DataTable data, int dataRowStart)

 55         {

 56             int i = 0;

 57             int j = 0;

 58             try

 59             {

 60                 if (sheet != null)

 61                 {

 62                     for (i = 0; i < data.Rows.Count; ++i)

 63                     {

 64                         IRow row = sheet.CreateRow(dataRowStart);

 65                         for (j = 0; j < data.Columns.Count; ++j)

 66                         {

 67                             row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());

 68                         }

 69                         ++dataRowStart;

 70                     }

 71                     workbook.Write(fs); //写入到excel

 72                 }

 73                 return dataRowStart;

 74             }

 75             catch (Exception ex)

 76             {

 77                 Console.WriteLine("Exception: " + ex.Message);

 78                 return -1;

 79             }

 80         }

 81 

 82         /// <summary>

 83         /// 将excel中的数据导入到DataTable中

 84         /// </summary>

 85         /// <param name="sheetName">excel工作薄sheet的名称</param>

 86         /// <param name="dataRowStart">数据起始行索引</param>

 87         /// <returns>返回的DataTable</returns>

 88         public DataTable ExcelToDataTable(DataTable tableModel, string sheetName, int dataRowStart)

 89         {

 90             ISheet sheet = null;

 91             DataTable data = tableModel.Clone();

 92             try

 93             {

 94                 fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);

 95                 if (fileName.IndexOf(".xlsx") > 0) // 2007版本

 96                     workbook = new XSSFWorkbook(fs);

 97                 else if (fileName.IndexOf(".xls") > 0) // 2003版本

 98                     workbook = new HSSFWorkbook(fs);

 99 

100                 if (sheetName != null)

101                 {

102                     sheet = workbook.GetSheet(sheetName);

103                     if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet

104                     {

105                         sheet = workbook.GetSheetAt(0);

106                     }

107                 }

108                 else

109                 {

110                     sheet = workbook.GetSheetAt(0);

111                 }

112                 if (sheet != null)

113                 {

114                     IRow firstRow = sheet.GetRow(dataRowStart);

115                     int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

116                     //最后一列的标号

117                     int rowCount = sheet.LastRowNum;

118                     for (int i = dataRowStart; i <= rowCount; ++i)

119                     {

120                         IRow row = sheet.GetRow(i);

121                         if (row == null) continue; //没有数据的行默认是null

122 

123                         DataRow dataRow = data.NewRow();

124                         for (int j = row.FirstCellNum; j < cellCount; ++j)

125                         {

126                             if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null

127                                 dataRow[j] = row.GetCell(j).ToString();

128                         }

129                         data.Rows.Add(dataRow);

130                     }

131                 }

132 

133                 return data;

134             }

135             catch (Exception ex)

136             {

137                 Console.WriteLine("Exception: " + ex.Message);

138                 return null;

139             }

140         }

141         /// <summary>

142         /// 设置表头（支持单元格合并）

143         /// </summary>

144         /// <param name="sheet">要合并单元格所在的sheet</param>

145         /// <param name="mergeArrayList">需要进行单元格合并的单元格索引数组，数组长度为4，第一个为行起始位置，第二个为行结束为止，第三个为列起始位置，第四个为列结束为止</param>

146         /// <param name="valueList">单元格合并后值的集合，与合并单元格索引数组集合一一对应</param>

147         //public void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend, string value)

148         public void SetExcelHeader(ISheet sheet, IList<int[]> mergeArrayList, IList<string> valueList)

149         {

150             for (int m = 0; m < mergeArrayList.Count; m++)

151             {

152                 if (mergeArrayList[m].Length > 4)

153                 {

154                     return;

155                 }

156                 int rowstart = mergeArrayList[m][0];

157                 int rowend = mergeArrayList[m][1];

158                 int colstart = mergeArrayList[m][2];

159                 int colend = mergeArrayList[m][3];

160                 string value = "";

161                 if (m < valueList.Count)

162                 {

163                     value = valueList[m];

164                 }

165                 ICellStyle style = workbook.CreateCellStyle();

166                 style.Alignment = HorizontalAlignment.Center;

167                 IFont font = workbook.CreateFont();

168                 font.Boldweight = 700;

169                 font.FontHeight = 20 * 20;

170                 style.SetFont(font);

171                 for (int i = rowstart; i < rowend + 1; i++)

172                 {

173                     IRow row = sheet.GetRow(i);

174                     if (row==null)

175                     {

176                         row = sheet.CreateRow(i);

177                     }

178                     for (int j = colstart; j < colend + 1; j++)

179                     {

180                         ICell cell = row.CreateCell(j);

181                         cell.SetCellValue(value);

182                         cell.CellStyle = style;

183                     }

184                 }

185                 if (rowend - rowstart > 0 || colend - colstart > 0)

186                 {

187                     CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);

188                     sheet.AddMergedRegion(cellRangeAddress);

189                 }

190             }

191             //workbook.Write(fs);

192         }

193 

194         public void Dispose()

195         {

196             Dispose(true);

197             GC.SuppressFinalize(this);

198         }

199 

200         protected virtual void Dispose(bool disposing)

201         {

202             if (!this.disposed)

203             {

204                 if (disposing)

205                 {

206                     if (fs != null)

207                         fs.Close();

208                 }

209 

210                 fs = null;

211                 disposed = true;

212             }

213         }

214     }

215 }

CommenClass