How to use EnumConverter with CsvHelper

Question

I\'m using CsvHelper to serialize a class to csv file - until here everything works well.

Now I\'m trying to find a way to convert the class\'s enum properties to th

Answer 1

This is how I did it for the latest version of CSV Helper which is 7.1.1:

public class AggregateEnumConverter : EnumConverter where T : struct
{
    public AggregateEnumConverter() : base(typeof(T)) { }

    public override object ConvertFromString(string text, IReaderRow row, MemberMapData memberMapData)
    {
        if(!Enum.TryParse(text, out AggregateType aggregateType))
        {
            // This is just to make the user life simpler...
            if(text == "24HAVG")
            {
                return AggregateType._24HAVG;
            }

            // If an invalid value is found in the CSV for the Aggregate column, throw an exception...
            throw new InvalidCastException($"Invalid value to EnumConverter. Type: {typeof(T)} Value: {text}");
        }

        return aggregateType;
    }
}

Note: the code above is making use of C# 7 new inline out variables.
More info here: How should I convert a string to an enum in C#?

This is how you make use of the custom EnumConverter:

/// 

/// Maps Tag class properties to the CSV columns' names
/// 
public sealed class TagMap : ClassMap
{
    public TagMap(ILogger logger)
    {
        Map(tag => tag.Aggregate).Name("aggregate").TypeConverter>();
    }
}