73 lines
2.2 KiB
C#
73 lines
2.2 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Elwig.Helpers.Export {
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public abstract class CsvFile<T> : IExporter<T> {
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public static string FileExtension => "csv";
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private readonly StreamWriter _writer;
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protected readonly char Separator;
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protected string? Header;
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public CsvFile(string filename, char separator = ';') :
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this(filename, separator, Utils.UTF8) {
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}
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public CsvFile(string filename, char separator, Encoding encoding) {
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_writer = new StreamWriter(filename, false, encoding);
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Separator = separator;
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}
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public void Dispose() {
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GC.SuppressFinalize(this);
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_writer.Dispose();
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}
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public async Task ExportAsync(IEnumerable<T> data, IProgress<double>? progress = null) {
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progress?.Report(0.0);
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int count = data.Count() + 2, i = 0;
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if (Header != null) await _writer.WriteLineAsync(Header);
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progress?.Report(100.0 * ++i / count);
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foreach (var row in data) {
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await _writer.WriteLineAsync(FormatRow(row));
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progress?.Report(100.0 * ++i / count);
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}
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await _writer.FlushAsync();
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progress?.Report(100.0);
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}
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public string FormatRow(IEnumerable row) {
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return string.Join(Separator, row);
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}
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public abstract string FormatRow(T row);
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}
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public class CsvSimple : CsvFile<IEnumerable<object?>> {
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public CsvSimple(string filename, char separator, Encoding encoding) :
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base(filename, separator, encoding) {
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}
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public CsvSimple(string filename, char separator = ';') :
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base(filename, separator) {
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}
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public override string FormatRow(IEnumerable<object?> row) {
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return string.Join(Separator, row.Select(i => {
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var str = $"{i}";
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return str.Contains(Separator) || str.Contains('\n') ? $"\"{str.Replace("\"", "\"\"")}\"" : str;
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}));
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}
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}
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}
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