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 }