ParseTest.cs

class Program
{
    static void Main(string[] args)
    {
        var data = 
            "No., Name, Price, Comment" + Environment.NewLine
          + "001, りんご, 98円, 青森産" + Environment.NewLine
          + "002, バナナ, 120円, \"    とっても!\r\nお,い,し,い,よ!\"" + Environment.NewLine
          + "" + Environment.NewLine
          + "004, \"うまい棒\"\"めんたい\"\"\", 10円," + Environment.NewLine
          + "005, バナメイ海老, 800円, \"300ｇ\r\n\r\nエビチリに\"";
         
        Console.WriteLine("<< XsvReader.Parse() >>");
        foreach (var row in Parse(data))
        {
            Console.WriteLine(row.ConcatWith(";") + "<n>");
        }
        Console.WriteLine("");                        
        Console.WriteLine("<< TextFieldParser (TrimWhiteSpace=true) >>");
        foreach (var row in ReadFields(data,trimWS:true))
        {
            Console.WriteLine(row.ConcatWith(";") + "<n>");
        }
        Console.WriteLine("");
        Console.WriteLine("<< TextFieldParser (TrimWhiteSpace=false) >>");
        foreach (var row in ReadFields(data,trimWS:false))
        {
            Console.WriteLine(row.ConcatWith(";") + "<n>");
        }
    }    

    static IEnumerable<string[]> Parse(string data) 
    {
        using (var sr = new StringReader(data))
        {
            var line = sr.ReadLine();
            while (line != null)
            {
                yield return XsvReader.Parse(line, new[] { "," }, () => sr.ReadLine()).ToArray();
                line = sr.ReadLine();
            }
        }
    }

    static IEnumerable<string[]> ReadFields(string data,bool trimWS) 
    {
        using (var tfp = new Microsoft.VisualBasic.FileIO.TextFieldParser(new StringReader(data)))
        {
            tfp.Delimiters = new[] { "," };
            tfp.TrimWhiteSpace = trimWS;
            while (!tfp.EndOfData)
            {
                yield return tfp.ReadFields();
            }
        }
    }
}