Adding detectable Nullable values to CsvHelper

Question

I was wondering if CsvHelper by Josh Close has anything in the configuration I am missing to translate values to null. I am a huge fan of this library, but I always thought there should be some sort of configuration to let it know what values represent NULL in your file. An example would be a column with the value "NA", "EMPTY", "NULL", etc. I am sure I could create my own TypeConverter, but I was hoping there would be an easier option to set somewhere in a config as this tends to be fairly common with files I encounter.

Is there a configuration setting to do this relatively easily?

I found the TypeConversion in the CsvHelper.TypeConversion namespace but am not sure where to apply something like this or an example of the correct usage:

new NullableConverter(typeof(string)).ConvertFromString(new TypeConverterOptions(), "NA")

I am also using the latest version 2.2.2

Thank you!

Answer 1

I think some time in the last seven years and thirteen versions since this question was asked the options for doing this without a custom type map class expanded, e.g.:

csvReader.Context.TypeConverterOptionsCache.GetOptions<string>().NullValues.Add("NULL");
csvReader.Context.TypeConverterOptionsCache.GetOptions<DateTime?>().NullValues.AddRange(new[] { "NULL", "0" });
csvReader.Context.TypeConverterOptionsCache.GetOptions<int?>().NullValues.Add("NULL");
csvReader.Context.TypeConverterOptionsCache.GetOptions<bool>().BooleanFalseValues.Add("0");
csvReader.Context.TypeConverterOptionsCache.GetOptions<bool>().BooleanTrueValues.Add("1");