Get column position of fields from IReaderRow context / GetField

[StefanBertels]

When parsing field values I want to use the column position in the row for error messages.
Currently I can only get the row number.

I use this custom method for getting the value (member map):

map.Convert((ConvertFromStringArgs args) => ...)

This means I have an IReaderRow context available with .Row.
I can call .GetField(...) to get the raw field value (input for my custom parser).

My custom parser tells me the error position within raw field value. This error message cannot be used (directly) to find the problem in the file.

Currently I can add the line offset (args.Row.Parser.Row) to my parser input context to fix the original error message but this only fixes the line number. Sadly I cannot add the column offset.

The required information is internally stored in (non public) Field in CsvParser.
Would it be possible to pass this down to user code ("make it public" somehow)?

My use case does not involve line breaks within values but to be consistent maybe there could be variants:

• RawColumnByte (corresponding to RawRow and byteCount)
• ColumnByte (corresponding to Row and byteCount)
• RawColumnChar (corresponding to RawRow and charCount)
• ColumnChar (corresponding to Row and charCount)

Maybe

 map.Convert((ConvertFromStringArgs args) => args.Row.GetFieldWithContext(map.Data.Names.First()) ...)

returning a tuple or an interface IFieldContext(string? Value, int ColumnByte, int ColumnChar ...)?