NPOI高效匯出Excel

using

system.collections.generic;
using
system.data;
using
system.io;
using
system.linq;
using
npoi.hssf.usermodel;
using
npoi.ss.usermodel;
using
npoi.xssf.usermodel;
public
class
excelhelper
else
dt.columns.add(
newdatacolumn(obj.tostring()));
columns.add(i);
}//資料
for (int i = sheet.firstrownum + 1; i <= sheet.lastrownum; i++)
}if(hasvalue)}}
return
dt; }
//////
將datatable資料匯出到excel檔案中(xls)
/// ///
///public
static
void tabletoexcelforxls(datatable dt, string
file)
//資料
for (int i = 0; i < dt.rows.count; i++)
}//轉為位元組陣列
memorystream stream = new
memorystream();
hssfworkbook.write(stream);
var buf =stream.toarray();
//儲存為excel檔案
using (filestream fs = new
filestream(file, filemode.create, fileaccess.write))
}//////
獲取單元格型別(xls)
/// ///
///private
static
object
getvaluetypeforxls(hssfcell cell)
}#endregion
} 
public
class
x2007
else
dt.columns.add(
newdatacolumn(obj.tostring()));
columns.add(i);
}//資料
for (int i = sheet.firstrownum + 1; i <= sheet.lastrownum; i++)
}if(hasvalue)}}
return
dt; }
//////
將datatable資料匯出到excel檔案中(xlsx)
/// ///
///public
static
void tabletoexcelforxlsx(datatable dt, string
file)
//資料
for (int i = 0; i < dt.rows.count; i++)
}//轉為位元組陣列
memorystream stream = new
memorystream();
xssfworkbook.write(stream);
var buf =stream.toarray();
//儲存為excel檔案
using (filestream fs = new
filestream(file, filemode.create, fileaccess.write))
}//////
獲取單元格型別(xlsx)
/// ///
///private
static
object
getvaluetypeforxlsx(xssfcell cell)
}#endregion
} 
public
static datatable getdatatable(string
filepath)
else
return
dt; }
}

using

system;
using
system.collections.generic;
using
system.web;
using
system.web.ui;
using
system.web.ui.webcontrols;
using
system.data;
using
system.linq;
public
partial
class
_default : system.web.ui.page 
protected
void btn_read_03_click(object
o, eventargs e)
protected
void btn_read_07_click(object
o, eventargs e)
protected
void btn_import_03_click(object
o, eventargs e)
excelhelper.x2003.tabletoexcelforxls(dt, path);
downloadfile(path);
}protected
void btn_import_07_click(object
o, eventargs e)
excelhelper.x2007.tabletoexcelforxlsx(dt, path);
downloadfile(path);
}void downloadfile(string
s_path)
}

如果要提高效能千萬切記，不要在內迴圈中亂用下面的設定，要不效能就是幾秒與幾分鐘的差異。

sheet.autosizecolumn(cellindex, true);

icellstyle style = workbook.createcellstyle();

style.borderbottom = borderstyle.thin;

style.borderleft = borderstyle.thin;

style.borderright = borderstyle.thin;

style.bordertop = borderstyle.thin;

cell.cellstyle = style;

npoi 單元格格式設定 

npoi自適應寬度不支援中文解決方案 

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