Nuget CsvHelper 的使用

CsvHelper：nuget地址

csv导出类||生成类

    public class CSVHeader
    {
        public string head1 { get; set; }
        public string head2 { get; set; }
        public string head3 { get; set; }
        public string head4 { get; set; }
        public string head5 { get; set; }
    }

csv map 类

    public class CSVHeaderMap : CsvClassMap<CSVHeader>
    {
        public CSVHeaderMap()
        {
            Map(m => m.head1).Name("head1");
            Map(m => m.head2).Name("head2");
            Map(m => m.head3).Name("head3");
            Map(m => m.head4).Name("head4");
            Map(m => m.head5).Name("head5");
        }
    }

csv operate 类

    public class CSVHelper<T> where T : class
    {
        private static Logger _logger = NLog.LogManager.GetCurrentClassLogger();

        public static string GeneralCSV(List<T> dataList, string csvFileName, string localPath)
        {
            if (dataList == null || dataList.Count == 0)
            {
                Console.WriteLine("no report date");
                return "";
            }
            try
            {
                string localFileName = string.IsNullOrWhiteSpace(csvFileName) ? $"{DateTime.Now.ToString("yyyyMMddhhssmmm")}.csv" : csvFileName;

                if (!Directory.Exists(localPath))
                {
                    Directory.CreateDirectory(localPath);
                }
                string csvContent = "";
                using (FileStream fs = new FileStream(Path.Combine(localPath, localFileName), FileMode.Create, FileAccess.ReadWrite))
                using (StreamWriter strW = new StreamWriter(fs, Encoding.UTF8))
                {

                    csvContent = GenerateCsvContent(dataList);

                    if (csvContent == null) return "";
                    strW.Write(csvContent);
                }
                return csvContent;
            }
            catch (Exception ex)
            {
                Console.WriteLine("GeneralCSV",
                                $"csvFileName:{csvFileName}, Path:{localPath}",
                                ex.Message);
                return "";
            }
        }

        static string GenerateCsvContent(List<T> itemList, bool hasHeaderRecord = true)
        {
            try
            {
                using (StringWriter sWriter = new StringWriter())
                {
                    CsvConfiguration config = new CsvConfiguration();
                    config.HasHeaderRecord = hasHeaderRecord;
                    //char soh = 'u0001';
                    //config.Delimiter = soh.ToString();
                    using (var csv = new CsvWriter(sWriter, config))
                    {
                        csv.WriteRecords(itemList);

                        return sWriter.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                var itemContent = JsonConvert.SerializeObject(itemList);
                Console.Write("HDFSApiHelper.GenerateCsvFile"
                                  , $"itemList:{itemContent}"
                                  , ex.Message);
                return null;
            }
        }

        public static List<T> GetEntityFromCSV<M>(Stream csvMemory,string delimiter=",") where M : CsvClassMap<T>
        {
            var csvReader = new StreamReader(csvMemory);
            var csvConfig = new CsvConfiguration();
            csvConfig.HasHeaderRecord = true;
            csvConfig.RegisterClassMap<M>();
            CsvReader csv = new CsvReader(csvReader, csvConfig);
            return csv.GetRecords<T>().ToList();
        }

        public static List<T> GetEntityFromCSV(Stream csvMemory, string delimiter = ",") 
        {
            var csvReader = new StreamReader(csvMemory);
            var temp = csvReader.ReadToEnd();
            var csvConfig = new CsvConfiguration()
            {
                HasHeaderRecord = true,
                IgnoreHeaderWhiteSpace = true,
                IsHeaderCaseSensitive = false,
                Delimiter = delimiter
            };
            var csv = new CsvReader(csvReader);
            try
            {
                return csv.GetRecords<T>().ToList();

            }
            catch(Exception ex)
            {
                _logger.Error(ex.ToString());
            }
            return null;
        }
    }

csv test method

            List<CSVHeader> test = new List<CSVHeader>();
            test.Add(new CSVHeader() { head1="1",head2="2",head3="3",head4="4",head5="5"});
            test.Add(new CSVHeader() { head1 = "1", head2 = "2", head3 = "3", head4 = "4", head5 = "5" });
            test.Add(new CSVHeader() { head1 = "1", head2 = "2", head3 = "3", head4 = "4", head5 = "5" });
            test.Add(new CSVHeader() { head1 = "1", head2 = "2", head3 = "3", head4 = "4", head5 = "5" });
            test.Add(new CSVHeader() { head1 = "1", head2 = "2", head3 = "3", head4 = "4", head5 = "5" });
            string csvDirectory = @"D:Jimmy Team ProjectDoc2017-11-20日报表汇总	est";
            //生成csv
            CSVHelper<CSVHeader>.GeneralCSV(test,"test.csv", csvDirectory);

           //csv获取list 数据
            var mergeExcelPath = csvDirectory+ @"
esult.xlsx";
            using (FileStream fs = new FileStream(csvDirectory + @"test.csv", FileMode.Open, FileAccess.Read))
            {
                List<CSVHeader> date = CSVHelper<CSVHeader>.GetEntityFromCSV<CSVHeaderMap>(fs, ",");
            }