how to access records in csv helper-CodePudding

The code below reads a column of a csv file. It does that properly. I want to copy var records to a decimal array. I am using csv helper. How best to do it?

using (var reader = new StreamReader(filename))
using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
{
    var records = new List<Filevalues>();
    csv.Read();
    csv.ReadHeader();
    while (csv.Read())
    {
        var record = new Filevalues
        {            
            File_vals = csv.GetField<decimal>("File_vals"),   
        };

        records.Add(record);
    }
}

public class Filevalues
{
    public decimal File_vals{ get; set; }
}

CodePudding user response：

Either:

using (var reader = new StreamReader(filename))
using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
{
    var listOfDecimals = new List<decimal>();
    csv.Read();
    csv.ReadHeader();
    while (csv.Read())
    {
        listOfDecimals.Add(csv.GetField<decimal>("File_vals"));
    }

    var arrayOfDecimals = listOfDecimals.ToArray();
}

ToArray: https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.toarray

Or:

using (var reader = new StreamReader(filename))
using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
{
    var records = new List<Filevalues>();
    csv.Read();
    csv.ReadHeader();
    while (csv.Read())
    {
        var record = new Filevalues
        {
            File_vals = csv.GetField<decimal>("File_vals"),   
        };
        records.Add(record);
    }

    var arrayOfDecimals = records.Select(x => x.File_vals).ToArray();
}

public class Filevalues
{
    public decimal File_vals{ get; set; }
}

LINQ Projection: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/linq/projection-operations

CodePudding user response：

At its most simple:

using var csv = new CsvReader(new StreamReader(filename), CultureInfo.InvariantCulture));
csv.GetRecords<Filevalues>().Select(f => f.File_vals).ToArray();

(I think I'd ToList() it instead of array, and work with the List)

If the CSV is so simple that it's just a list of decimals, I might skip using a CSV library all together:

File.ReadLines(path).Skip(1).Select(decimal.Parse).ToArray();