一、新建项目Vlook项目

using MiniExcelLibs;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data;
using System.IO;

namespace Vlook
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var dir = AppContext.BaseDirectory;
            Console.WriteLine("请输入对比的Excel源：");
            var fileName1 = Console.ReadLine();
            var path1 = Path.Combine(dir, fileName1);
            Console.WriteLine("请输入对比的Exce2源：");
            var fileName2 = Console.ReadLine();
            var path2 = Path.Combine(dir, fileName2);

            var rows1 = MiniExcel.Query(path1);
            var rows2 = MiniExcel.Query(path2);

            var equalColumns = new List<string>();
            Console.WriteLine("请输关联列，输入0退出：");
            while (true)
            {
                var column = Console.ReadLine();
                if (column.ToString().ToLower() == "0")
                {
                    break;
                }
                equalColumns.Add(column);
            }

            var compareColumns = new List<string>();

            Console.WriteLine("请输对比的列，输入0退出：");
            while (true)
            {
                var column = Console.ReadLine();
                if (column.ToString().ToLower() == "0")
                {
                    break;
                }
                compareColumns.Add(column);
            }

            var moreDatas = new List<object>();
            var lessDatas = new List<object>();
            var diffDatas = new List<object>();
            var sameDatas = new List<object>();

            var tuple = CompareCore(rows1, rows2, equalColumns, compareColumns);
            moreDatas.AddRange(tuple.moreDatas);
            diffDatas.AddRange(tuple.diffDatas);
            sameDatas.AddRange(tuple.sameDatas);

            var tuple2 = CompareCore(rows2, rows1, equalColumns, compareColumns);
            lessDatas.AddRange(tuple2.moreDatas);

            var compareResultPath= Path.Combine(dir, DateTime.Now.ToString("yyyy-MM-dd HH_mm_ss").ToString()+"_对比结果.xlsx");
            var sheets = new Dictionary<string, object>
            {
                ["moreDatas"] = moreDatas,
                ["lessDatas"] = lessDatas,
                ["diffDatas"] = diffDatas,
                ["sameDatas"] = sameDatas
            };
            MiniExcel.SaveAs(compareResultPath, sheets);

            Console.WriteLine("Done");
        }

        private static (List<object> moreDatas, List<object> diffDatas, List<object> sameDatas) CompareCore(IEnumerable<dynamic> rows1, IEnumerable<dynamic> rows2, List<string> equalColumns, List<string> compareColumns)
        {
            var moreDatas = new List<object>();
            var diffDatas = new List<object>();
            var sameDatas = new List<object>();

            var i = 0;
            foreach (var row1 in rows1)
            {
                if (i == 0)
                {
                    i++;
                    continue;
                }
                var equalColumnValue1 = GetEqualColumnValue(row1, equalColumns);
                var exist = false;
                dynamic row2Temp = null;
                var j = 0;
                foreach (var row2 in rows2)
                {
                    if (j == 0)
                    {
                        j++;
                        continue;
                    }
                    var equalColumnValue2 = GetEqualColumnValue(row2, equalColumns);
                    if (equalColumnValue1 == equalColumnValue2)
                    {
                        exist = true;
                        row2Temp = row2;
                        break;
                    }
                    j++;
                }
                if (exist)
                {
                    var compareColumnValue1 = GetCompareColumnValue(row1, compareColumns);
                    var compareColumnValue2 = GetCompareColumnValue(row2Temp, compareColumns);
                    if (compareColumnValue1 == compareColumnValue2)
                    {
                        sameDatas.Add(row1);
                    }
                    else
                    {
                        diffDatas.Add(row1);
                    }
                }
                else
                {
                    moreDatas.Add(row1);
                }
                i++;
            }

            return ( moreDatas,  diffDatas,sameDatas);
        }

        private static string GetEqualColumnValue(dynamic row, List<string> equalColumns)
        {
            var str = "";
            foreach (var equalColumn in equalColumns)
            {
                str += ((IDictionary<string, object>)row)[equalColumn];
            }
            return str;
        }

        private static string GetCompareColumnValue(dynamic row, List<string> compareColumns)
        {
            var str = "";
            foreach (var compareColumn in compareColumns)
            {
                str += ((IDictionary<string, object>)row)[compareColumn];
            }
            return str;
        }
    }
}

二、首先我们准备两个Products1.xlsx和Products2.xlsx，并给出差异

Products1.xlsx

Products2.xlsx

 

执行程序：