使用Fluent NHibernate将List <string>映射到分隔的字符串

public class StringListType : IUserType
{
    public new bool Equals(object x, object y)
    {
        return object.Equals(x, y);
    }

    public int GetHashCode(object x)
    {
        return x.GetHashCode();
    }

    public object NullSafeGet(IDataReader rs, string[] names, object owner)
    {
        var value = NHibernateUtil.String.NullSafeGet(rs, names[0]);
        if (value == null)
        {
            return new List<string>();
        }

        return ((string)value).Split(',').ToList();
    }

    public void NullSafeSet(IDbCommand cmd, object value, int index)
    {
        if (value == null)
        {
            ((IDataParameter)cmd.Parameters[index]).Value = DBNull.Value;
        }
        else
        {
            var strings = (List<string>)value;
            ((IDataParameter)cmd.Parameters[index]).Value = string.Join(",", strings);
        }
    }

    public object DeepCopy(object value)
    {
        return value;
    }

    public object Replace(object original, object target, object owner)
    {
        return original;
    }

    public object Assemble(object cached, object owner)
    {
        return cached;
    }

    public object Disassemble(object value)
    {
        return value;
    }

    public SqlType[] SqlTypes
    {
        get
        {
            return new[] { new SqlType(DbType.String) };
        }
    }

    public Type ReturnedType
    {
        get
        {
            return typeof(List<string>);
        }
    }

    public bool IsMutable
    {
        get
        {
            return true;
        }
    }
}

public class MyClassMap : ClassMap<MyClass>
{
    public MyClassMap()
    {
        Id(x => x.Id);
        Map(x => x.Name);
        Map(x => x.StringList).CustomType<StringListType>().Column("StringListColumn");
    }
}