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SQLVision.Services/Exporters/CsvExporter.cs

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+using CsvHelper;
+using CsvHelper.Configuration;
+using Microsoft.Extensions.Logging;
+using SQLVision.Core.Models;
+using System.Data;
+
+namespace SQLVision.Services.Exporters;
+
+public class CsvExporter : IExportHandler
+{
+    private readonly ILogger<CsvExporter> _logger;
+
+    public string FormatName => "CSV";
+
+    public CsvExporter(ILogger<CsvExporter> logger)
+    {
+        _logger = logger;
+    }
+
+    public async Task ExportAsync(DataTable data, string filePath, ExportOptions options)
+    {
+        var config = new CsvConfiguration(System.Globalization.CultureInfo.CurrentCulture)
+        {
+            Delimiter = options.CustomOptions.TryGetValue("Delimiter", out var delimiter)
+                ? delimiter.ToString() ?? ","
+                : ","
+        };
+
+        using var writer = new StreamWriter(filePath);
+        using var csv = new CsvWriter(writer, config);
+
+        // Запись заголовков
+        if (options.IncludeHeaders)
+        {
+            foreach (DataColumn column in data.Columns)
+            {
+                csv.WriteField(column.ColumnName);
+            }
+            csv.NextRecord();
+        }
+
+        // Запись данных
+        foreach (DataRow row in data.Rows)
+        {
+            for (int i = 0; i < data.Columns.Count; i++)
+            {
+                csv.WriteField(row[i]);
+            }
+            csv.NextRecord();
+        }
+
+        await csv.FlushAsync();
+        _logger.LogInformation("Exported {Rows} rows to CSV: {FilePath}", data.Rows.Count, filePath);
+    }
+
+    public async Task<byte[]> ExportToMemoryAsync(DataTable data, ExportOptions options)
+    {
+        using var stream = new MemoryStream();
+        using var writer = new StreamWriter(stream);
+        using var csv = new CsvWriter(writer, System.Globalization.CultureInfo.CurrentCulture);
+
+        // Запись заголовков
+        if (options.IncludeHeaders)
+        {
+            foreach (DataColumn column in data.Columns)
+            {
+                csv.WriteField(column.ColumnName);
+            }
+            csv.NextRecord();
+        }
+
+        // Запись данных
+        foreach (DataRow row in data.Rows)
+        {
+            for (int i = 0; i < data.Columns.Count; i++)
+            {
+                csv.WriteField(row[i]);
+            }
+            csv.NextRecord();
+        }
+
+        await csv.FlushAsync();
+        await writer.FlushAsync();
+        return stream.ToArray();
+    }
+}