LINQ IN類型查詢可基於另一個查詢的結果集獲取記錄

Question

UserAuthorizations表具有每個用戶明智的公司名稱，我想獲取為其分配的用戶的公司清單。

        // 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));

        }

對於上面我得到像

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

Answer 1

試試吧

        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));
        }