Question

我需要使用TeamsDTO列表填充UserDTO的IQueryable，而无需foreach循环或具体化数据。

我有以下课程：

public class User
{
    public int Id {get;set;}
    public string Name {get;set;}
    public List<Team> Teams {get;set;}
}

public class Team
{
    public int Id {get;set;}
    public string Teamname {get;set;}
    public string Description {get;set;}
}

以及以下DTO：

public class UserDTO
{
    public int Id {get;set;}
    public List<TeamDTO> TeamsDTOList{get;set;}
}

public class TeamDTO
{
    public int Id {get;set;}
    public string Teamname {get;set;}
}

到目前为止，还有《守则》：

public static IQueryable<UserDTO> GetQueryableUserDTO(IQueryable<User> query)
        {
            var retQueryable = Enumerable.Empty<UserDTO>().AsQueryable();
            try
            {
                retQueryable = query.AsEnumerable()
                                .Select(k => new UserDTO
                                {
                                    Id = k.Id,
                                    TeamsDTOList= new List<TeamDTO>()
                                    {
                                        //Can't figure out this part
                                    }
                                });
            }
            catch (Exception ex)
            {
                BaseManager.Write2Log(ex);
            }
            return retQueryable;
        }

非常感谢您的帮助。

P.S .：当然，类/代码是一个简化的示例。

Answer 1

那呢：

retQueryable = query.AsEnumerable().Select(k => new UserDTO()
                {
                    Id = k.Id,
                    TeamsDTOList = k.Teams.Select(t => new TeamDTO(){ Id = t.Id, Teamname = t.Teamname}).ToList()
                });

IQueryable List <DTO>转换

1 个答案: