使用LINQ返回子对象

    public class ProjectManager
    {
        public int ProjectID { get; set; }
        public Project Project { get; set; }

        public string AppUserID { get; set; }
        public AppUser AppUser { get; set; }
    }

我有以下视图模型:

    public class DeleteUserFromProjectViewModel
    {
        public IQueryable<AppUser> Users { get; set; }
        public PagingInfo PagingInfo { get; set; }
    }

Users 对于我的ViewModel:

                DeleteUserFromProjectViewModel model = new DeleteUserFromProjectViewModel
                {
                    //HOW DO I RETURN JUST THE APPUSERS FROM THE PROJECT MANAGER OBJECT?
                    //Users = repository.ProjectManagers.Any(p => p.ProjectID == projectId).Select;

                    PagingInfo = new PagingInfo
                    {
                        CurrentPage = page,
                        ItemsPerPage = PageSize,
                        TotalItems = proj.ProjectManagers.Count()
                    }

                };

我已经试过了

                List<AppUser> userList = new List<AppUser>();
                foreach(ProjectManager pm in proj.ProjectManagers)
                {
                    //this gives error that cannot convert string userId to char??
                    foreach (string userId in pm.AppUserID)
                    {
                        AppUser newUser = await userManager.FindByIdAsync(userId);
                        userList.Add(newUser);
                    }
                }