LINQ IN类型查询可基于另一个查询的结果集获取记录

Question

UserAuthorizations table has Company per User wise, and I want to get the list of Companies for the Users which are assigned as to them.

        // GET: odata/Companies/GetUserCompanies
        [EnableQuery]
        public IQueryable<UserAuthorization> GetUserCompanies()
        {
            List<int> userCompanyIds = db.UserAuthorizations.Where(u => u.Cwid == this.UserId).Select(s => s.CompanyId).ToList();
            return db.Companies.Where(m => m.Id.ToString().Contains(userCompanyIds));

        }

For above I am getting error like

Cannot convert from 'System.Collections.Generic.List<int>' to 'string'

Answer 1

try it

        public IQueryable<Company> GetUserCompanies()
        {
            List<int> userCompanyIds = db.UserAuthorizations.Where(u => u.Cwid == this.UserId).Select(s => s.CompanyId).ToList();
            return db.Companies.Where(m => userCompanyIds.Contains(m.Id));
        }