IQueryable List<DTO> 转换

Question

我需要在没有 foreach 循环或具体化数据的情况下用 TeamsDTO 列表填充 UserDTO 的 IQueryable。

我有以下类:

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;}
}

到目前为止的代码：

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;
        }

提前感谢您的帮助。

P.S.: Classes/code当然是简化的例子。

Answer 1

这个怎么样:

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

IQueryable List<DTO> conversion

.net

c#

linq

entity-framework-6