The extensions of NPOI, which provides IEnumerable<T> save to and load from excel functionality.

1. Using Package Manager Console to install NPOI.Extension

    PM> Install-Package NPOI.Extension
   

2. Reference NPOI.Extension in code

    using NPOI.Extension;
   

3. Apply attribute to the model

    [Filter(FirstCol = 0, FirstRow = 0, LastCol = 2)]
    [Freeze(ColSplit = 2, RowSplit = 1, LeftMostColumn = 2, TopRow = 1)]
    [Statistics(Name = "合计", Formula = "SUM", Columns = new[] { 6, 7 })]
    public class Report {
        [Column(Index = 0, Title = "城市", AllowMerge = true)]
        public string City { get; set; }
        [Column(Index = 1, Title = "楼盘", AllowMerge = true)]
        public string Building { get; set; }
        [Column(Index = 2, Title = "成交时间")]
        public DateTime HandleTime { get; set; }
        [Column(Index = 3, Title = "经纪人")]
        public string Broker { get; set; }
        [Column(Index = 4, Title = "客户")]
        public string Customer { get; set; }
        [Column(Index = 5, Title = "房源")]
        public string Room { get; set; }
        [Column(Index = 6, Title = "佣金(元)")]
        public decimal Brokerage { get; set; }
        [Column(Index = 7, Title = "收益(元)")]
        public decimal Profits { get; set; }
    }
   

4. Using extension methods

    var len = 1000;
    var reports = new Report[len];
    for (int i = 0; i < len; i++) {
        reports[i] = new Report {
                City = "ningbo",
                Building = "世茂首府",
                HandleTime = new DateTime(2015, 11, 23),
                Broker = "RigoFunc 18957139**7",
                Customer = "RigoFunc 18957139**7",
                Room = "2#1703",
                Brokerage = 125M,
                Profits = 25m
        };
   
        // other data here...
    }
   
    // save the excel file
    reports.ToExcel(@"C:\demo.xls");
   

5. Load IEnumerable≶T> from excel

    // load from excel
    var loadFromExcel = Excel.Load<Report>(@"C:\demo.xls");