这篇文章主要为大家详细介绍了c#导入导出excel数据的两种方法,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文为大家分享了c#导入导出excel数据的具体代码,供大家参考,具体内容如下
注:对于实体类对象最好新建一个并且继承原有实体类,这样可以将类型进行修改;
方法一:此种方法是用epplus中的fileinfo流进行读取的(是不是流我还真不太了解,若有懂得请留言,非常感谢了)
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using abp.extensions;
namespace hyzt.ltxy.international.ctrip.exporting
{
public class excellib
{
public ictrippolicyexcelimport getexcel(string filepath)
{
if (filepath.trim() .isnullorempty())
throw new exception("文件名不能为空");
//因为这儿用得是epplus对excel进行的操作,所以只能操作
//2007以后的版本以后的(即扩展名为.xlsx)
if (!filepath.trim().endswith("xlsx"))
throw new exception("请使用office excel 2007版本或2010版本");
else if (filepath.trim().endswith("xlsx"))
{
ictrippolicyexcelimport res = new ctrippolicyexcelimport(filepath.trim());
return res;
}
else return null;
}
}
}
方法接口:
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
namespace hyzt.ltxy.international.ctrip.exporting
{
public interface ictrippolicyexcelimport
{
/// <summary> 打开文件 </summary>
bool open();
//excelversion version { get; }
/// <summary> 文件路径 </summary>
string filepath { get; set; }
/// <summary> 文件是否已经打开 </summary>
bool ifopen { get; }
/// <summary> 文件包含工作表的数量 </summary>
int sheetcount { get; }
/// <summary> 当前工作表序号 </summary>
int currentsheetindex { get; set; }
/// <summary> 获取当前工作表中行数 </summary>
int getrowcount();
/// <summary> 获取当前工作表中列数 </summary>
int getcolumncount();
/// <summary> 获取当前工作表中某一行中单元格的数量 </summary>
/// <param name="row">行序号</param>
int getcellcountinrow(int row);
/// <summary> 获取当前工作表中某一单元格的值(按字符串返回) </summary>
/// <param name="row">行序号</param>
/// <param name="col">列序号</param>
string getcellvalue(int row, int col);
/// <summary> 关闭文件 </summary>
void close();
}
}
方法实现:
using officeopenxml;
using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.text;
using system.threading.tasks;
namespace hyzt.ltxy.international.ctrip.exporting
{
public class ctrippolicyexcelimport:ictrippolicyexcelimport
{
public ctrippolicyexcelimport()
{ }
public ctrippolicyexcelimport(string path)
{ filepath = path; }
private string filepath = "";
private excelworkbook book = null;
private int sheetcount = 0;
private bool ifopen = false;
private int currentsheetindex = 0;
private excelworksheet currentsheet = null;
private excelpackage ep = null;
public bool open()
{
try
{
ep = new excelpackage(new fileinfo(filepath));
if (ep == null) return false;
book =ep.workbook;
sheetcount = book.worksheets.count;
currentsheetindex = 0;
currentsheet = book.worksheets[1];
ifopen = true;
}
catch (exception ex)
{
throw new exception(ex.message);
}
return true;
}
public void close()
{
if (!ifopen || ep == null) return;
ep.dispose();
}
//public excelversion version
//{ get { return excelversion.excel07; } }
public string filepath
{
get { return filepath; }
set { filepath = value; }
}
public bool ifopen
{ get { return ifopen; } }
public int sheetcount
{ get { return sheetcount; } }
public int currentsheetindex
{
get { return currentsheetindex; }
set
{
if (value != currentsheetindex)
{
if (value >= sheetcount)
throw new exception("工作表序号超出范围");
currentsheetindex = value;
currentsheet =book.worksheets[currentsheetindex+1];
}
}
}
public int getrowcount()
{
if (currentsheet == null) return 0;
return currentsheet.dimension.end.row;
}
public int getcolumncount()
{
if (currentsheet == null) return 0;
return currentsheet.dimension.end.column;
}
public int getcellcountinrow(int row)
{
if (currentsheet == null) return 0;
if (row >= currentsheet.dimension.end.row) return 0;
return currentsheet.dimension.end.column;
}
//根据行号和列号获取指定单元格的数据
public string getcellvalue(int row, int col)
{
if (currentsheet == null) return "";
if (row >= currentsheet.dimension.end.row || col >= currentsheet.dimension.end.column) return "";
object tmpo =currentsheet.getvalue(row+1, col+1);
if (tmpo == null) return "";
return tmpo.tostring();
}
}
}
方法调用实现功能:
//用于程序是在本地,所以此时的路径是本地电脑的绝对路劲;
//当程序发布后此路径应该是服务器上的绝对路径,所以在此之前还要有
//一项功能是将本地文件上传到服务器上的指定位置,此时在获取路径即可
public string getexceltoctrippolicy(string filepath)
{
excellib lib = new excellib();
if (filepath == null)
return new returnresult<bool>(false, "未找到相应文件");
string str= tmp.getcellvalue(i, j);
return str;
}
方法二:将excel表格转化成datatable表,然后在对datatable进行业务操作
using abp.application.services;
using officeopenxml;
using system;
using system.collections.generic;
using system.data;
using system.io;
using system.linq;
using system.text;
using system.threading.tasks;
namespace hyzt.ltxy.international.ctrip.getexceltodatatable
{
public class epplushelperappservice:applicationservice,iepplushelperappservice
{
private static string getstring(object obj)
{
try
{
return obj.tostring();
}
catch (exception ex)
{
return "";
}
}
/// <summary>
///将指定的excel的文件转换成datatable (excel的第一个sheet)
/// </summary>
/// <param name="fullfielpath">文件的绝对路径</param>
/// <returns></returns>
public datatable worksheettotable(string filepath)
{
try
{
fileinfo existingfile = new fileinfo(filepath);
excelpackage package = new excelpackage(existingfile);
excelworksheet worksheet = package.workbook.worksheets[1];//选定 指定页
return worksheettotable(worksheet);
}
catch (exception)
{
throw;
}
}
/// <summary>
/// 将worksheet转成datatable
/// </summary>
/// <param name="worksheet">待处理的worksheet</param>
/// <returns>返回处理后的datatable</returns>
public static datatable worksheettotable(excelworksheet worksheet)
{
//获取worksheet的行数
int rows = worksheet.dimension.end.row;
//获取worksheet的列数
int cols = worksheet.dimension.end.column;
datatable dt = new datatable(worksheet.name);
datarow dr = null;
for (int i = 1; i <= rows; i++)
{
if (i > 1)
dr = dt.rows.add();
for (int j = 1; j <= cols; j++)
{
//默认将第一行设置为datatable的标题
if (i == 1)
dt.columns.add(getstring(worksheet.cells[i, j].value));
//剩下的写入datatable
else
dr[j - 1] = getstring(worksheet.cells[i, j].value);
}
}
return dt;
}
}
}
之前我有一个程序用的是方法一进行excel导入的,速度不是很快,后来我又用了第二种方法但是速度更慢了,到底这两种方法哪种快,请指导,还是我用第二种方法的时候业务判断有问题,不得而知,就请明白人指导我到底这两种方法哪种比较好些。
以上就是c#实现导入导出excel数据的两种方法详解的详细内容。