如何在没有编码问题的情况下将 DataTable 转换为 CSV

Question

I have a code about which transforms DataTable to CSV file. There is no problem about it. But when i look to CSV file some Turkish Characters (ISO-8859-9) seems wrong. I have to solve encoding problem;

StringBuilder sb = new StringBuilder();

        IEnumerable<string> columnNames = dt.Columns.Cast<DataColumn>().
                                          Select(column => column.ColumnName);
        sb.AppendLine(string.Join(",", columnNames));

        foreach (DataRow row in dt.Rows)
        {
            IEnumerable<string> fields = row.ItemArray.Select(field =>
              string.Concat("\"", field.ToString().Replace("\"", "\"\""), "\""));
            sb.AppendLine(string.Join(",", fields));
        }

        File.WriteAllText("Gecisler" + Tarih + ".csv", sb.ToString());

Answer 1

Instead of "rolling" your own CSV writer, I recommend using Pnyx library. It gracefully handles file encoding, Unix/windows newlines, and RFC 4180 compliant CSV formatting.

Here is an example using its fluent API (replace some_xxx with actual values):

        string Tarih = "some_value";
        DataTable dt = some_data();

        using (Pnyx p = new Pnyx())
        {
            p.setSettings(outputEncoding: Encoding.GetEncoding(some_encoding()));
            p.readRowFunc(
                source: () => dt.Rows.Cast<DataRow>().Select(dataRow => dataRow.ItemArray.Select(obj => obj.ToString()).ToList()),
                header: () => dt.Columns.Cast<DataColumn>().Select(column => column.ColumnName).ToList()
            );
            p.writeCsv("Gecisler" + Tarih + ".csv");
        }

Full disclosure: I am a contributor to the library.