將SQL查詢轉換為LINQ

Question

我希望有人幫助我將此SQL查詢轉換為LINQ語法。

SELECT i.Id, i.Condomino as Condomino, i.Interno as Interno, 
    p.NomePiano as NomePiano, s.Nome as NomeCondominio,
    m.millesimi_fabbisogno_acs, m.millesimi_fabbisogno_riscaldamento
    FROM Interni i
    INNER JOIN Piani p ON i.IdPiano = p.Id
    INNER JOIN Stabili s ON i.IdStabile = s.Id
    LEFT JOIN MillesimiTabellaC m ON i.Id = m.idInterno
    WHERE s.IdCondominio = {0}

我嘗試使用類似的方法，但無法正常工作。

return _Db.Interni.Include("Piani").Where(x => x.Piani.IdCondominio == iidcond).ToList();

Answer 1

我是當場制作的（因此未經測試），但是也許足以給您這個想法。 我還假設您的數據庫模型已設置了外鍵。

var result = _db.Interni
                .Where(i => i.Stabili.IdCondominio = [value])
                .Select(i => new
                             {
                                 i.Id,
                                 Condomino = i.Condomino, 
                                 Interno = i.Interno,
                                 NomePiano = i.Piani.NomePiano,
                                 NomeCondominio = i.Stabili.Nome,
                                 i.MillesimiTabellaC.millesimi_fabbisogno_acs, 
                                 i.MillesimiTabellaC.millesimi_fabbisogno_riscaldamento
                             })
                .ToList();

更新

如果您在Interni和MillesimiTabellaC之間沒有外鍵，請嘗試以下操作：

var result = _db.Interni
                .Include(i => i.Piani)
                .Include(i => i.Stabili)
                .Where(i => i.Stabili.IdCondominio = [value])
                .Select(i => new
                             {
                                Interni = i,
                                MillesimiTabellaC = _db.MillesimiTabellaC.Where(m => i.Id = m.idInterno)
                             })
                .Select(x => new
                             {
                                 Id = x.Interni.Id,
                                 Condomino = x.Interni.Condomino, 
                                 Interno = x.Interni.Interno,
                                 NomePiano = x.Interni.Piani.NomePiano,
                                 NomeCondominio = x.Interni.Stabili.Nome,
                                 x.MillesimiTabellaC?.millesimi_fabbisogno_acs, 
                                 x.MillesimiTabellaC?.millesimi_fabbisogno_riscaldamento
                             })
                .ToList();