Библиотека CsvHelper – быстрый и простой в использовании способ чтения и записи пользовательских объектов в csv-файлы.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
Imports CsvHelper Imports System.IO ... Public Class MyDataClass Public Property FieldA As Integer Public Property FieldB As String .... Public Property FieldX As String End Class ... ' *** Пишем в CSV файл *** Dim MyData1 = New MyDataClass With {.FieldA = 1, .FieldB = "2", .FieldX = "X"} Using writer = New StreamWriter(Server.MapPath("~/AppData/Output.csv")) Dim csv = New CsvWriter(writer) csv.Configuration.Encoding = Encoding.UTF8 csv.WriteHeader(Of MyDataClass)() csv.WriteRecord(MyData) End Using ' *** Читаем из CSV файла *** Using reader = New StreamReader(Server.MapPath("~/AppData/Output.csv"), True) Dim csv = New CsvReader(reader) csv.Configuration.IgnoreHeaderWhiteSpace = True 'csv.Configuration.Delimiter = ";" 'CSVReader will now read the whole file into an enumerable Dim records As IEnumerable(Of MyDataClass) = csv.GetRecords(Of MyDataClass)().ToList() 'First 5 records in CSV file will be printed 'For Each record As DataRecord In records.Take(5) For Each record In records.Take(3) Response.Write(record.FieldA, record.FieldB, record.FieldX) Next End Using |
