[Linq To CSV] #dotnet

LinqToCSVHelper.cs

public static class LinqToCSVHelper
{
    public static string ToCsv<T>(this IEnumerable<T> items, bool hasHeader = true, bool hasWrapper = false, string separator = ",")
        where T : class
    {
        var csvBuilder = new StringBuilder();
        var properties = typeof(T).GetProperties();
        var firstLine = hasHeader;

        foreach (var item in items)
        {
            if (firstLine)
            {
                var header = string.Join(separator, properties.Select(p => p.Name.ToCsvValue(hasWrapper)).ToArray());
                csvBuilder.AppendLine(header);
                firstLine = false;
            }
            var line = string.Join(separator, properties.Select(p => p.GetValue(item).ToCsvValue(hasWrapper)).ToArray());
            csvBuilder.AppendLine(line);
        }
        return csvBuilder.ToString();
    }

    private static string ToCsvValue<T>(this T item, bool hasWrapper)
    {
        var wrapper = hasWrapper ? "\"" : "";

        if (item == null) return $"{wrapper}{wrapper}";

        if (item is string && item.ToString().Contains("\""))
        {
            return string.Format($"\"{item.ToString().Replace("\"", "\"\"")}\"");
        }

        if (double.TryParse(item.ToString(), out var dummy))
        {
            return string.Format($"{item}");
        }

        return string.Format($"{wrapper}{item}{wrapper}");
    }
}