WHERE IN子句AS对象实体框架

Question

如果我有一个Company对象:

var companies = db.Companies.Where(...);

和一个User与Company对象相关的对象one-to-many:

var users = db.Users.Where(...);

我怎样才能达到像这样的标准 select * from users where user.company in (company)

从一些文章中读到,我尝试过类似的东西:

users.Where(x => companies.Contains(x.company))

但似乎不起作用.我错过了什么？

编辑

确切答案:

public PartialViewResult IndexGrid(String search)
{
    var companies = db.Users.Find(User.Identity.GetUserId()).Companies.AsQueryable();
    Guid[] guids = companies.Select(c => c.Id).ToArray();

    if (String.IsNullOrEmpty(search))
        return PartialView("_IndexGrid", db.Set<Quotation>().OrderByDescending(x => x.Code).AsQueryable()
            .Where(x => guids.Contains(x.Company.Id)));
    else
        return PartialView("_IndexGrid", db.Set<Quotation>().OrderByDescending(x => x.Code).AsQueryable()
            .Where(x => guids.Contains(x.Company.Id))
            .Where(x => x.Code.Contains(search)|| x.MasterCustomer.Name.Contains(search)));
}

Answer 1

当您使用最后一个变体时

users.Where(x => companies.Contains(x.company))

.Net不知道如何比较公司并使用对同等对象的引用.如果贵公司有id属性,请试试这个.如果没有,请告诉我.

users.Where(x => companies.Select(c => c.Id).Contains(x.company.Id))