string-to-xml-mapper.cs

using System.Xml;
using AutoMapper;

namespace AutoMapperTest;

public class Entity {
    public XmlDocument Statement { get; set; }
}

public class Model {
    public string Statement { get; set; }
}

public class StringToXmlConverter : IValueConverter<string, XmlDocument> {

    public XmlDocument Convert(string sourceMember, ResolutionContext context) {
        var xmlDoc = new XmlDocument();
        if (!string.IsNullOrEmpty(sourceMember)) {
            xmlDoc.LoadXml(sourceMember);
        }
        return xmlDoc;
    }
}

public class Program {

    public static void Main(string[] args) {
        var config = new MapperConfiguration(cfg => {
            cfg.CreateMap<Entity, Model>()
                .ForMember(d => d.Statement, opt => opt.MapFrom(s => s.Statement.OuterXml))
                .ReverseMap()
                // .ForMember(d => d.Statement, opt => opt.MapFrom(s => StringToXmlDoc(s.Statement)));
                // .ForMember(
                //     d => d.Statement,
                //     opt => opt.ConvertUsing(new StringToXmlConverter(), s => s.Statement)
                // );
                .ForMember(
                    dest => dest.Statement,
                    map => map.Ignore()
                ).AfterMap(
                    (apiModel, api) => api.Statement = StringToXmlDoc(apiModel.Statement)
                );
        });
        config.AssertConfigurationIsValid();
        config.CompileMappings();

        var mapper = config.CreateMapper();
        var entity = new Entity {
            Statement = new XmlDocument()
        };
        entity.Statement.LoadXml("<abc>xxx</abc>");
        var model = mapper.Map<Model>(entity);
        Console.WriteLine(model.Statement);
        entity = mapper.Map<Entity>(model);
        Console.WriteLine(entity.Statement);
    }

    private static XmlDocument StringToXmlDoc(string xml) {
        var xmlDoc = new XmlDocument();
        if (!string.IsNullOrEmpty(xml)) {
            xmlDoc.LoadXml(xml);
        }
        return xmlDoc;
    }
}