读写Excle,不用office环境
1.下载NPOI.dll,并添加引用
2.ExcelHelper帮助类,以下为读写的参照方法
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
HSSFWorkbook hssfworkbook;
#region 导入Excel 返回Table
public
DataTable ImportExcelFile(
string
filePath)
{
#region//初始化信息
try
{
using
(FileStream file =
new
FileStream(filePath, FileMode.Open, FileAccess.Read))
{
hssfworkbook =
new
HSSFWorkbook(file);
}
}
catch
(Exception e)
{
throw
e;
}
#endregion
NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
DataTable dt =
new
DataTable();
for
(
int
j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
{
dt.Columns.Add(Convert.ToChar(((
int
)
'A'
) + j).ToString());
}
while
(rows.MoveNext())
{
HSSFRow row = (HSSFRow)rows.Current;
DataRow dr = dt.NewRow();
for
(
int
i = 0; i < row.LastCellNum; i++)
{
NPOI.SS.UserModel.ICell cell = row.GetCell(i);
if
(cell ==
null
)
{
dr[i] =
null
;
}
else
{
dr[i] = cell.ToString();
}
}
dt.Rows.Add(dr);
}
return
dt;
}
#endregion
#region 导出excel
//Datatable导出Excel
public
MemoryStream GridToExcelByNPOI(DataTable dt)
{
try
{
HSSFWorkbook workbook =
new
HSSFWorkbook();
ISheet sheet = workbook.CreateSheet(
"Sheet1"
);
ICellStyle HeadercellStyle = workbook.CreateCellStyle();
HeadercellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
HeadercellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
HeadercellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
HeadercellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
HeadercellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
//字体
NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
headerfont.Boldweight = (
short
)FontBoldWeight.Bold;
HeadercellStyle.SetFont(headerfont);
//用column name 作为列名
int
icolIndex = 0;
IRow headerRow = sheet.CreateRow(0);
foreach
(DataColumn item
in
dt.Columns)
{
ICell cell = headerRow.CreateCell(icolIndex);
cell.SetCellValue(item.ColumnName);
cell.CellStyle = HeadercellStyle;
icolIndex++;
}
ICellStyle cellStyle = workbook.CreateCellStyle();
//为避免日期格式被Excel自动替换，所以设定 format 为 『@』 表示一率当成text來看
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat(
"@"
);
cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
NPOI.SS.UserModel.IFont cellfont = workbook.CreateFont();
cellfont.Boldweight = (
short
)FontBoldWeight.Normal;
cellStyle.SetFont(cellfont);
//建立内容行
int
iRowIndex = 1;
int
iCellIndex = 0;
foreach
(DataRow Rowitem
in
dt.Rows)
{
IRow DataRow = sheet.CreateRow(iRowIndex);
foreach
(DataColumn Colitem
in
dt.Columns)
{
ICell cell = DataRow.CreateCell(iCellIndex);
cell.SetCellValue(Rowitem[Colitem].ToString());
cell.CellStyle = cellStyle;
iCellIndex++;
}
iCellIndex = 0;
iRowIndex++;
}
//自适应列宽度
for
(
int
i = 0; i < icolIndex; i++)
{
sheet.AutoSizeColumn(i);
}
//写Excel
MemoryStream ms =
new
MemoryStream ();
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
return
ms;
}
catch
(Exception ex)
{
throw
ex;
}
}
#endregion
|