C# Winforms - 读取 csv 文件时出现问题

Question

I have looked at all of the csv reading examples I can find and I'm not quite sure where I'm going wrong with this one.

I am fairly new to C# but loving it so far!

Anyway heres the code that works great most of the time (you can see by the comments I have tried a bunch of different options in the read):

StreamReader sr = new StreamReader(csvFileToImport);
                while (sr.EndOfStream != true)
                {
                    string line = sr.ReadLine();
                //string[] value = line.Split(new string[] { "\",\"" }, StringSplitOptions.None);
                //string[] value = line.Split(new string[] {","}, StringSplitOptions.None);
                //string[] value = line.Split(new string[] { "(?=(?:[^']*'[^']*')*[^']*$)" }, StringSplitOptions.None);
                //string[] value = line.Split(new string[] { "," }, StringSplitOptions.None);
                string[] value = Regex.Split(line, @"\s|[,]");

                StockItem si = new StockItem();
                    switch (stockFile.Supplier)
                    {
                        case "Leader":
                            si.Supplier = stockFile.Supplier;
                            si.Category = value[2].Replace("'", "''");
                            si.StockCode = value[11].Replace("'", "''");
                            si.Cost = Convert.ToDecimal(value[7]);
                            si.Description = value[4].Replace("'", "''");
                            si.Image = value[9].Replace("'", "''");
                            si.Manufacturer = value[10].Replace("'", "''");
                            si.Sell = Convert.ToDecimal(value[8]);
                            si.StockAdelaide = value[17].Replace("'", "''");
                            si.StockBrisbane = value[18].Replace("'", "''");

                            si.StockMelbourne = value[19].Replace("'", "''");
                            si.StockPerth = value[20].Replace("'", "''");
                            si.StockSydney = value[21].Replace("'", "''");
                            si.Subcategory = value[3].Replace("'", "''");

                            //Add line into db
                            string sql = "insert into Stock (Supplier, StockCode, Manufacturer, Category, Subcategory, Description, Cost, Sell, Image, StockPerth, StockAdelaide, StockSydney, StockBrisbane, StockMelbourne) values ('" + si.Supplier + "', '" + si.StockCode + "', '" + si.Manufacturer + "', '" + si.Category + "', '" + si.Subcategory + "', '" + si.Description + "', " + si.Cost + ", " + si.Sell + ", '" + si.Image + "', '" + si.StockPerth + "', '" + si.StockAdelaide + "', '" + si.StockSydney + "', '" + si.StockBrisbane + "', '" + si.StockMelbourne + "')";
                            cmd = new SqlCommand(sql, cn);
                            cmd.ExecuteNonQuery();
                            break;
                        default:
                            break;
                    }
                }
                success = true;
                cn.Close();

I have linked to a 1 line csv file which doesnt read correctly if anyone wouyld be so good as to have a look I would be really greatful!

Thanks in advance, and also feel free to point out any general code I could improve... I'm sure there is lots to improve on.

Thanks again:)

CSV Link: https://www.dropbox.com/s/nnaruu0twds3wrl/csv_error.csv?dl=0

UPDATE:

Apologies for the lack of clarity, as I am reading the file I get the following error:

System.FormatException: 'Input string was not in a correct format.'

The line reads as:

"MECMD4VL2X426,ME,Memory,DDR-4 (Desktop),Corsair Vengeance LPX 8GB (2x4GB) DDR4 2666MHz C16 Desktop Gaming Memory Black,\"Corsair 8GB (2x4GB) DDR4 2666MHz Vengeance LPX Black"

When I query the array it shows the values as:

value[0] "MECMD4VL2X426"
value[1] "ME"
value[2] "Memory"
value[3] "DDR-4"
value[4] "(Desktop)"
value[5] "Corsair"
value[6] "Vengeance"
value[7] "LPX"
...

It appears to get stuck on the brackets (that should be read into value[3]), and then starts seperating on space instead of comma.

Im happy to use a 3rd party csv reader if needed, however I'd love to understand how it works myself.

Answer 1

Reading the csv you use string line = sr.ReadLine(); but the RFC 4180 , 2.6 tell us that a field containig multiples lines should be encapsuled with DQuote " .

So reading the file line by line will be an issue if those multiples lines field exist in your document.
I would drop the hand made regex and the ReadLine and use a more robust parser like CSV Helper .

Then define the object you want to get from the CSV.

public class Leader
{
    public string LongColumn6 { get; set; }

    public string Supplier { get; set; }
    public string Category { get; set; }
    public string StockCode { get; set; }
    public Decimal Cost { get; set; }
    public string Description { get; set; }
    public string Image { get; set; }
    public string Manufacturer { get; set; }
    public Decimal Sell { get; set; }
    public string StockAdelaide { get; set; }
    public string StockBrisbane { get; set; }
    public string StockMelbourne { get; set; }
    public string StockPerth { get; set; }
    public string StockSydney { get; set; }
    public string Subcategory { get; set; }
}

And it's respective mapper: column & is Foo properties etc..

public sealed class LeaderMap : ClassMap<Leader>
{
    public LeaderMap()
    {
        Map(m => m.LongColumn6).Index(5); // the column that cause the issue

        //complete the List
        Map(m => m.Category).Index(2);
        Map(m => m.StockCode).Index(11);
        Map(m => m.Cost).Index(7);
        Map(m => m.Description).Index(4);
    }
}

Then the reading is simple:

using (var csvReader = new CsvReader(reader,  CultureInfo.InvariantCulture ))
{   
    csvReader.Configuration.HasHeaderRecord = false;
    csvReader.Configuration.RegisterClassMap<LeaderMap>();
    records = csvReader.GetRecords<Leader>().ToList();
}

Note that in this live demo . I used a StringReader in order to mimic a file Reader.
You can use a file reader and pass it your path.