BcfFormatT Delegate

public delegate T BcfFormat<T>(
	BcfColumn<T> column,
	T proposedValue
)

Public Delegate Function BcfFormat(Of T) ( 
	column As BcfColumn(Of T),
	proposedValue As T
) As T

public static class SetupHelper 
{
    public static void AddStringTrimming(BcfDataSetSetup setup) 
    {
        foreach(var stringColumnSetup in setup.Tables.Where(t => t.Columns != null).SelectMany(t => t.Columns).OfType<BcfColumnSetup<string>>()) 
        {
            if(!stringColumnSetup.HasFormatter) stringColumnSetup.Formatter = StringColumnFormatter;
        }
    }
    private static string StringColumnFormatter(BcfColumn<string> column, string proposedValue) 
    {
        var s = proposedValue?.Trim();
        if(column.AllowNull && s == string.Empty) return null;
        return s;
    }
}