Stringification Registry

ConfigureStringifierExpression.cs

public class ConfigureStringifierExpression
{
    private readonly Func<StringifyRequest, bool> _predicate;
    private readonly StringifierModel _model;

    public ConfigureStringifierExpression(Func<StringifyRequest, bool> predicate, StringifierModel model)
    {
        _predicate = predicate;
        _model = model;
    }

    public void ConvertUsing(Func<StringifyRequest, string> converter)
    {
        _model.AddStringifier(new LambdaStringifier(_predicate, converter));
    }
}

LambdaStringifier.cs

public class LambdaStringifier : IStringifier
{
    private readonly Func<StringifyRequest, bool> _predicate;
    private readonly Func<StringifyRequest, string> _converter;

    public LambdaStringifier(Func<StringifyRequest, bool> predicate, Func<StringifyRequest, string> converter)
    {
        _predicate = predicate;
        _converter = converter;
    }

    public bool Matches(StringifyRequest request)
    {
        return _predicate(request);
    }

    public string Stringify(StringifyRequest request)
    {
        return _converter(request);
    }
}

MyStringifierRegistry.cs

public class MyStringifierRegistry : StringifierRegistry
{
    public MyStringifierRegistry()
    {
        IfRequestMatches(r => r.RequestType == typeof(DateTime))
            .ConvertUsing(r => ((DateTime)r.RawValue).ToString("MM/dd/yyyy HH:mm:ss"));
    }
}

StringifierRegistry.cs

public class StringifierRegistry
{
    private readonly StringifierModel _model = new StringifierModel();

    public StringifierRegistry()
    {
        AddStringifier<DefaultStringifier>();
    }

    public void AddStringifier<TStringifier>()
        where TStringifier : IStringifier
    {
        _model.AddStringifier(typeof(TStringifier));
    }

    public void AddStringifier(IStringifier stringifier)
    {
        _model.AddStringifier(stringifier);
    }

    public ConfigureStringifierExpression IfRequestMatches(Func<StringifyRequest, bool> predicate)
    {
        return new ConfigureStringifierExpression(predicate, _model);
    }

    public StringifierModel BuildModel()
    {
        return _model;
    }
}