如何在 linq lambda select 的帮助下映射到另一个对象列表

我在某个时候停止了，我不知道如何将 Project 列表映射到 ProjectResponse 对象列表。ProjectResponse 是 Project 模型类及其技术​​上的 DTO 对象的缩短版本。

这是事情

public async Task<IEnumerable<ClientResponse>> Handle(GetClientsQuery query, CancellationToken cancellationToken)
{
    List<Client> clientsDb = await _context.Clients.Include(x => x.Projects).Where(client => !client.IsDeleted).ToListAsync();
    Result<List<UserData>> clientsIdentity = await _identityService.GetClients(clientsDb.Select(x => x.IdentityId).ToList());

    List<ClientResponse> clients = new List<ClientResponse>();


    foreach (var client in clientsIdentity.Data)
    {
        clients.Add(new ClientResponse
        {
            //two properties are filling up from clientsIdentity.Data 
            Email = client.Email,
            Name = client.Name,

            //second two from clientsDb
            Id = clientsDb.FirstOrDefault(x => x.IdentityId.Equals(client.Id)).Id,

            //One client has multiple projects (List<Project>)
            //List<Project> need to be transformed and packed to List<ProjectResponse> (it's a dto object for Project model)
            Projects = clientsDb.Where(x => x.IdentityId.Equals(client.Id)).Select(x => new ProjectResponse
            {
                //it shouldnt be FirstOrdefault - it now picksup always just from the first one, it should be some kind of foreach of projects..
                Id = x.Projects.FirstOrDefault().Id,
                Code = x.Projects.FirstOrDefault().Code,
                Name = x.Projects.FirstOrDefault().Name,
            }).ToList()
        });
    }

    return clients;
}

所以我设法只映射FirstOrDefault对象，但基本上我需要遍历 CLient 拥有的每个项目，并映射到新的 ClientResponse 项目，实际上是添加它们。