DataTableToExcel:
1 public static void dataTableToExcel(DataTable table, string fileName)
2 {
3 using (MemoryStream ms = new MemoryStream())
4 {
5
6 IWorkbook workbook = null;
7
8 if (fileName.IndexOf(".xlsx") > 0)
9 workbook = new XSSFWorkbook();
10 if (fileName.IndexOf(".xls") > 0)
11 workbook = new HSSFWorkbook();
12 ISheet sheet = workbook.CreateSheet();
13 IRow headerRow = sheet.CreateRow(0);
14
15 // handling header.
16 foreach (DataColumn column in table.Columns)
17 headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value
18
19 // handling value.
20 int rowIndex = 1;
21
22 foreach (DataRow row in table.Rows)
23 {
24 IRow dataRow = sheet.CreateRow(rowIndex);
25
26 foreach (DataColumn column in table.Columns)
27 {
28 dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
29 }
30
31 rowIndex++;
32 }
33
34 workbook.Write(ms);
35 ms.Flush();
36
37 using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
38 {
39 byte[] data = ms.ToArray();
40
41 fs.Write(data, 0, data.Length);
42 fs.Flush();
43
44 data = null;
45 }
46 }
47 }
ExcelToDataTable:
1 public static DataTable ExcelToDataTable(string filePath, bool isColumnName,int sheetName)
2 {
3 DataTable dataTable = null;
4 FileStream fs = null;
5 DataColumn column = null;
6 DataRow dataRow = null;
7 IWorkbook workbook = null;
8 ISheet sheet = null;
9 IRow row = null;
10 ICell cell = null;
11 int startRow = 0;
12 try
13 {
14 using (fs = File.OpenRead(filePath))
15 {
16 // 2007版本
17 if (filePath.IndexOf(".xlsx") > 0)
18 workbook = new XSSFWorkbook(fs);
19 // 2003版本
20 else if (filePath.IndexOf(".xls") > 0)
21 workbook = new HSSFWorkbook(fs);
22
23 if (workbook != null)
24 {
25 sheet = workbook.GetSheetAt(sheetName);//读取第一个sheet，当然也可以循环读取每个sheet
26 dataTable = new DataTable();
27 if (sheet != null)
28 {
29 int rowCount = sheet.LastRowNum;//总行数
30 if (rowCount > 0)
31 {
32 IRow firstRow = sheet.GetRow(0);//第一行
33 int cellCount = firstRow.LastCellNum;//列数
34
35 //构建datatable的列
36 if (isColumnName)
37 {
38 startRow = 1;//如果第一行是列名，则从第二行开始读取
39 for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
40 {
41 cell = firstRow.GetCell(i);
42 if (cell != null)
43 {
44 if (cell.StringCellValue != null)
45 {
46 column = new DataColumn(cell.StringCellValue);
47 dataTable.Columns.Add(column);
48 }
49 }
50 }
51 }
52 else
53 {
54 for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
55 {
56 column = new DataColumn("column" + (i + 1));
57 dataTable.Columns.Add(column);
58 }
59 }
60
61 //填充行
62 for (int i = startRow; i <= rowCount; ++i)
63 {
64 row = sheet.GetRow(i);
65 if (row == null) continue;
66
67 dataRow = dataTable.NewRow();
68 for (int j = row.FirstCellNum; j < cellCount; ++j)
69 {
70 cell = row.GetCell(j);
71 if (cell == null)
72 {
73 dataRow[j] = "";
74 }
75 else
76 {
77 //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
78 switch (cell.CellType)
79 {
80 case CellType.Blank:
81 dataRow[j] = "";
82 break;
83 case CellType.Numeric:
84 short format = cell.CellStyle.DataFormat;
85 //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
86 if (format == 14 || format == 31 || format == 57 || format == 58)
87 dataRow[j] = cell.DateCellValue;
88 else
89 dataRow[j] = cell.NumericCellValue;
90 break;
91 case CellType.String:
92 dataRow[j] = cell.StringCellValue;
93 break;
94 }
95 }
96 }
97 dataTable.Rows.Add(dataRow);
98 }
99 }
100 }
101 }
102 }
103 return dataTable;
104 }
105 catch (Exception ex)
106 {
107 Console.WriteLine("exception:" + ex.ToString());
108 Console.ReadLine();
109 if (fs != null)
110 {
111 fs.Close();
112 }
113 return null;
114 }
115 }
时间： 2024-08-29 06:30:09