C#导入导出Excel数据的两种方法
时间：2020-11-28 13:22:25|栏目：.NET代码|点击： 次
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。
