无法序列化成员＆＃39; x＆＃39;类型＆＃39; System.Collections.Generic.IList`1 [[x]]

Question

我正在尝试使用XmlSerializer将对象序列化为XML

我希望得到这样的东西：

<user>
    <username>administrator</username>
    <email>administrator@email.com</email>
    <roles>
        <roleId>D3DCBCDA-AD61-4764-B5A1-057D654F1C26</roleId>
        <role>admin</role>
        <roleId>D4DCBCDA-AD61-4764-B5A1-057D654F1C26</roleId>
        <role>editor</role>
    </roles>
</user>

内部异常

  

无法序列化类型＆{39; System.Collections.Generic.IList`1 [[Model.DTO.RoleDTO，Domain.Model，Version = 1.0.0.0，Culture = neutral，PublicKeyToken =]的成员'Model.DTO.UserDTO.role' null]]＆＃39;，有关详细信息，请参阅内部异常。

栈跟踪

at System.Xml.Serialization.StructModel.CheckSupportedMember(TypeDesc typeDesc, MemberInfo member, Type type)
at System.Xml.Serialization.StructModel.GetPropertyModel(PropertyInfo propertyInfo)
at System.Xml.Serialization.StructModel.GetFieldModel(MemberInfo memberInfo)
at System.Xml.Serialization.XmlReflectionImporter.InitializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter)
at System.Xml.Serialization.XmlReflectionImporter.ImportStructLikeMapping(StructModel model, String ns, Boolean openModel, XmlAttributes a, RecursionLimiter limiter)
at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter)

代码

IList<RoleDTO> rl = new List<RoleDTO>();

    rl.Add(new RoleDTO { roleId = new Guid("D3DCBCDA-AD61-4764-B5A1-057D654F1C26"), 
                         role = "admin" });
   rl.Add(new RoleDTO { roleId = new Guid("D4DCBCDA-AD61-4764-B5A1-057D654F1C26"), 
                         role = "editor" });


UserDTO user = new UserDTO 
             {
                username = "administrator",
                email = "administrator@email.com",
                role = rl
             };

 XmlSerializer x = new System.Xml.Serialization.XmlSerializer(xml.GetType());
 XmlSerializer xsSubmit = new XmlSerializer(typeof(FisaxmlDTO));
 StringWriter sww = new StringWriter();
 XmlWriter writer = XmlWriter.Create(sww);
 xsSubmit.Serialize(writer, user);
 var xmll = sww.ToString(); // Your xml

型号：

namespace Model.DTO
{
    public class UserDTO
    {
        public string username { get; set; }
        public string email { get; set; }
        public IList<RoleDTO> role { get; set; }
    }

    public class RoleDTO
    {
        public Guid roleId { get; set; }
        public string role { get; set; }
    }