Helpme從SQL轉換爲LINQ嵌套lambda表達式用的EntityFramework

Question

我正嘗試從SQL帶來了一些數據，但我不能使用LINQ做到這一點，在T-SQL這一工作：

select * 
from MTRBatch MB 
Inner Join MTR M on MB.Id = M.MTRBatchId 
Inner JOIN MTRHeats MH on M.Id = MH.MTRId 
LEFT OUTER JOIN Vendor V on MB.VendorId = v.Id 
Inner Join Manufacturer MF on MB.ManufacturerId = MF.Id 
Where MB.ManufacturerId = 1 
AND MH.Heat = 'z01' 

我需要所有樹，但與該過濾器。

我嘗試這一點，但沒有工作：

MTRBatches 
.Include(x => x.MTRs.Select(m => m.MTRHeats)) 
.Include(x => x.Manufacturer) 
.Include(x => x.Vendor) 
.Where(x => (x.Manufacturer.Id == 1)); 
.Where(x => x.MTRs.Any(m => m.MTRHeats.Any(h => h.Heat == 'z01'))); 

Answer 1

這應該幫助; dataContext是您的Entity Framework container實例的名稱。

var result = dataContext.MTRBatches 
    .Join(dataContext.MTRs, 
     mb => mb.Id, 
     mtr => mtr.MTRBatchId, 
     (mb, mtr) => new{ Batch = mb, MTR = mtr }) 
    .Join(dataContext.MTRHeats, 
     x => x.MTR.Id, 
     mh => mh.MTRId, 
     (x, mh) => new{ Batch = x.Batch, MTR = x.MTR, Heat = mh }) 
    .Join(dataContext.Vendors.DefaultIfEmpty(), 
     x => x.Batch.VendorId, 
     v => v.Id, 
     (x, v) => new{ Batch = x.Batch, MTR = x.MTR, Heat = x.Heat, Vendor = v }) 
    .Join(dataContext.Manufacturers, 
     x => x.Batch.ManufacturerId, 
     mf => mf.Id, 
     (x, mf) => new{ Batch = x.Batch, MTR = x.MTR, Heat = x.Heat, Vendor = x.Vendor, Manufacturer = mf}) 
    .Where(x => x.Manufacturer.Id == 1 && x.Heat.Heat == "z01");