C#导入导出Excel数据的两种方法

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。

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