实体框架使用左连接lambda加载数据

Question

I want to load from a specific id the list include details with lambda.

I tried it with following code:

// Load User Visitor list
var list = await Context.UserVisitors
                        .Where(s => s.UserId.Equals(userOwner.Id))
                        .Select(s => s.UserVisitorId)
                        .ToListAsync();

foreach (var t in list) 
{
     UserOwnerVisitors.Add(await Context.User
                                        .Include(u => u.Details)
                                        .Include(u => u.Settings)
                                        .FirstAsync(u => u.Id.Equals(t)));
}

The code works, but it is not efficient. How I can do it in one request with lambda?

Thanks in advance.

Answer 1

I am a little bit blind, as I don't know all your model's relationship, but below you can find what I think is your model, if you edit your question I can perhaps give you an exact answer:

var UserOwnerVisitorsList = from uv in Context.UserVisitors
                            join u in Context.User
                            on uv.UserId equals u.Id
                            join det in Context.Details
                            on det.UserId equals u.Id 
                            join set in Context.Settings
                            on set.UserId equals u.UserId
                            where uv.UserId == userOwner.Id
                            select u;