查詢值，如果它不是零使用實體框架

Question

使用EF，我想查詢一個整數，但如果值爲0，我不想做查詢。

rentalContext.Apartments 
    .Include(a => a.ApartmentType) 
    .Include(a => a.Files) 
    .Include(a => a.Address) 
    .Where(a => some other search conditions && 
     (filters.CityId != 0 && a.Address.CityObject.Id == filters.CityId)) 
    .ToList() 
    .OrderByDescending(a => a.Created); 

它工作正常，如果CityId不爲0，但如果是零，則返回列表中的0對象。這不是你應該這樣做的方式嗎？

Answer 1

現在只有在filters.CityId == 0爲false時纔會檢查第二個條件。

rentalContext.Apartments 
    .Include(a => a.ApartmentType) 
    .Include(a => a.Files) 
    .Include(a => a.Address) 
    .Where(a => some other search conditions && 
     (filters.CityId == 0 || a.Address.CityObject.Id == filters.CityId)) 
    .OrderByDescending(a => a.Created) 
    .ToList();