CShare_Common/Helper/Excel/ExcelHelper.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using ExcelDataReader;

namespace Common.Helper.Excel
{
    public class ExcelHelper
    {
        static ExcelHelper() { }

        private ExcelHelper() { }
        public static ExcelHelper Instance { get; } = new ExcelHelper();

        /// <summary>
        /// 读取excel的帮助类 必须传该excel有几列
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="columnCount"></param>
        /// <returns></returns>
        public List<List<string>> Read(string filePath,int columnCount)
        {
            var excelContent = new List<List<string>>();
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            using var stream = System.IO.File.Open(filePath, FileMode.Open, FileAccess.Read);
            using var reader = ExcelReaderFactory.CreateReader(stream);
            do
            {
                while (reader.Read())
                {

                    var cellContent = new List<string>();
                    for (var i = 0; i < columnCount; i++)
                    {
                        cellContent.Add(reader[i]==null?"": reader[i].ToString());
                    }
                    if(!cellContent.All(string.IsNullOrEmpty))
                        excelContent.Add(cellContent);
                }
            } while (reader.NextResult());
            return excelContent;
        }
    }
}