包含一組過濾記錄

Question

這可能嗎？

var results = (from c in _context.properties 
       where c.strap == somevalue 
       select c).include("characteristics).where(characteristics.cat_cd != 'DD'); 

基本上我想創建這個查詢。隨着應用程序的增長，我將包含其他表格。

select * from properties p,characteristics c 
where 
p.strap = c.strap 
and c.cat_cd <> 'DD' 

Answer 1

這是我的經驗教訓。

var results = (from c in _context.properties 
       where c.Characteristics.Any(c=>c.cat_cd == "DD") select c); 

Answer 2

你只需做一個join聲明：

var set = from property in _context.Properties 
      join characteristic in _context.Characteristcs on property.strap equals characteristic.strap 
      select new 
      { 
       Property = property, 
       Characteristic = characteristic 
      }