简单操作excel类

  1 class ExcelHelper : IDisposable
  2     {
  3         private string fileName = null; //文件名
  4         private IWorkbook workbook = null;
  5         private FileStream fs = null;
  6         private bool disposed;
  7 
  8         public ExcelHelper(string fileName)
  9         {
 10             this.fileName = fileName;
 11             disposed = false;
 12         }
 13 
 14         /// <summary>
 15         /// 将DataTable数据导入到excel中
 16         /// </summary>
 17         /// <param name="data">要导入的数据</param>
 18         /// <param name="isColumnWritten">DataTable的列名是否要导入</param>
 19         /// <param name="sheetName">要导入的excel的sheet的名称</param>
 20         /// <returns>导入数据行数(包含列名那一行)</returns>
 21         public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
 22         {
 23             int i = 0;
 24             int j = 0;
 25             int count = 0;
 26             ISheet sheet = null;
 27 
 28             fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
 29             if (fileName.IndexOf(".xlsx") > 0) // 2007版本
 30                 workbook = new XSSFWorkbook();
 31             else if (fileName.IndexOf(".xls") > 0) // 2003版本
 32                 workbook = new HSSFWorkbook();
 33 
 34             try
 35             {
 36                 if (workbook != null)
 37                 {
 38                     sheet = workbook.CreateSheet(sheetName);
 39                 }
 40                 else
 41                 {
 42                     return -1;
 43                 }
 44 
 45                 if (isColumnWritten == true) //写入DataTable的列名
 46                 {
 47                     IRow row = sheet.CreateRow(0);
 48                     for (j = 0; j < data.Columns.Count; ++j)
 49                     {
 50                         row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
 51                     }
 52                     count = 1;
 53                 }
 54                 else
 55                 {
 56                     count = 0;
 57                 }
 58 
 59                 for (i = 0; i < data.Rows.Count; ++i)
 60                 {
 61                     IRow row = sheet.CreateRow(count);
 62                     for (j = 0; j < data.Columns.Count; ++j)
 63                     {
 64                         row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
 65                     }
 66                     ++count;
 67                 }
 68                 workbook.Write(fs); //写入到excel
 69                 return count;
 70             }
 71             catch (Exception ex)
 72             {
 73                 Console.WriteLine("Exception: " + ex.Message);
 74                 return -1;
 75             }
 76         }
 77 
 78         /// <summary>
 79         /// 将excel中的数据导入到DataTable中
 80         /// </summary>
 81         /// <param name="sheetName">excel工作薄sheet的名称</param>
 82         /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
 83         /// <returns>返回的DataTable</returns>
 84         public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
 85         {
 86             ISheet sheet = null;
 87             DataTable data = new DataTable();
 88             int startRow = 0;
 89             try
 90             {
 91                 fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
 92                 if (fileName.IndexOf(".xlsx") > 0) // 2007版本
 93                     workbook = new XSSFWorkbook(fs);
 94                 else if (fileName.IndexOf(".xls") > 0) // 2003版本
 95                     workbook = new HSSFWorkbook(fs);
 96 
 97                 if (sheetName != null)
 98                 {
 99                     sheet = workbook.GetSheet(sheetName);
100                 }
101                 else
102                 {
103                     sheet = workbook.GetSheetAt(0);
104                 }
105                 if (sheet != null)
106                 {
107                     IRow firstRow = sheet.GetRow(0);
108                     int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
109 
110                     if (isFirstRowColumn)
111                     {
112                         for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
113                         {
114                             DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue);
115                             data.Columns.Add(column);
116                         }
117                         startRow = sheet.FirstRowNum + 1;
118                     }
119                     else
120                     {
121                         startRow = sheet.FirstRowNum;
122                     }
123 
124                     //最后一列的标号
125                     int rowCount = sheet.LastRowNum;
126                     for (int i = startRow; i <= rowCount; ++i)
127                     {
128                         IRow row = sheet.GetRow(i);
129                         if (row == null) continue; //没有数据的行默认是null　　　　　　　
130 
131                         DataRow dataRow = data.NewRow();
132                         for (int j = row.FirstCellNum; j < cellCount; ++j)
133                         {
134                             if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
135                                 dataRow[j] = row.GetCell(j).ToString();
136                         }
137                         data.Rows.Add(dataRow);
138                     }
139                 }
140 
141                 return data;
142             }
143             catch (Exception ex)
144             {
145                 Console.WriteLine("Exception: " + ex.Message);
146                 return null;
147             }
148         }
149 
150         public void Dispose()
151         {
152             Dispose(true);
153             GC.SuppressFinalize(this);
154         }
155 
156         protected virtual void Dispose(bool disposing)
157         {
158             if (!this.disposed)
159             {
160                 if (disposing)
161                 {
162                     if (fs != null)
163                         fs.Close();
164                 }
165 
166                 fs = null;
167                 disposed = true;
168             }
169         }
170     }
View Code
注意，一定要引用NPOI的dll。