.NET6匯入和匯出EXCEL
阿新 • • 發佈：2021-12-25
使用NPOI匯入.xlsx遇到“EOF in header”報錯，網上找好很多方法，沒解決，最後換成EPPlus.Core匯入。
匯出預設是.xls。
NPOI操作類：
using NPOI.HPSF;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Collections;
using System.Data;
namespace CommonUtils
{
/// <summary>
/// Excel操作相關
/// </summary>
public class ExcelHelper
{
#region 讀取Excel到DataTable
/// <summary>
/// 讀取ExcyzhDqSZ
EPPlus.Core工具類：
//using EPPlus.Extensions;
using OfficeOpenXml;
using System.Data;
namespace CommonUtils
{
/// <summary>
/// 使用 EPPlus 第三方的元件讀取Excel
/// </summary>
public class EPPlusHelper
{
private static string GetString(object obj)
{
if (obj == null)
return "";
return obj.ToString();
}
/// <summary>
///將指定的Excel的檔案轉換成DataTable （Excel的第一個sheet）
/// </summary>
/// <param name="fullFielPath">檔案的絕對路徑</param>
/// <returns></returns>
public static DataTable WorksheetToTable(string fullFielPath,string sheetName = null)
{
//如果是“EPPlus”，需要指定LicenseContext。
//EPPlus.Core 不需要指定。
//ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
FileInfo existingFile = new FileInfo(fullFielPath);
ExcelPackage package = new ExcelPackage(existingFile);
ExcelWorksheet worksheet = null;
if (string.IsNullOrEmpty(sheetName))
{
//不傳入 sheetName 預設取第1個sheet。
//EPPlus 索引是0
//EPPlus.Core 索引是1
worksheet = package.Workbook.Worksheets[1];
}
else
{
worksheet = package.Workbook.Worksheets[sheetName];
}
if (worksheet == null)
throw new Exception("指定的sheetName不存在");
return WorksheetToTable(worksheet);
}
/// <summary>
/// 將worksheet轉成datatable
/// </summary>
/// <param name="worksheet">待處理的worksheet</param>
/// <returns>返回處理後的datatable</returns>
public static DataTable WorksheetToTable(ExcelWorksheet worksheeyzhDqSZt)
{
//獲取worksheet的行數
int rows = worksheet.Dimension.End.Row;
//獲取worksheet的列數
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++)
{
//預設將第一行設定為datatable的標題
yzhDqSZ if (i == 1)
dt.Columns.Add(GetString(worksheet.Cells[i,j].Value));
//剩下的寫入datatable
else
dr[j - 1] = GetString(worksheet.Cells[i,j].Value);
}
}
return dt;
}
}
}
使用：
// See https://aka.ms/new-console-template for more information
using CommonUtils;
using System.Data;
Console.WriteLine("Hello,World!");
try
{
string dir = AppContext.BaseDirectory;
//2003
string fullName = Path.Combine(dir,"測試excel.xls");
DataTable dt = ExcelHelper.GetDataTable(fullName);
Console.WriteLine("Hello,World!" + dir);
//2007
string fullName2 = Path.Combine(dir,"測試excel.xlsx");
//dt = ExcelHelper.GetDataTable(fullName);
//DataTable dt2 = ExcelHelper.GetDataTable(fullName2,"sheetf");
DataTable dt2 = ExcelHelper.GetDataTable(fullName2);
string saveFullName = Path.Combine(dir,"save_excel.xls");
//ExcelHelper2.ExportExcelByMemoryStream(saveFullName,dt2);
string saveFullName2 = Path.Combine(dir,"save_excel2.xls");
ExcelHelper.GenerateExcel(dt2,saveFullName2);
Console.WriteLine("Hello,World!" + dir);
}
catch (Exception ex)
{
Console.WriteLine("ex:" + ex.Message);
}
Console.ReadKey();
原始碼：http://xiazai.jb51.net/202112/yuanma/ConsoleOperExcel_jb51.rar，使用vs2022 。
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