複雜的SQL LINQ轉換與子查詢

Question

我想從SQL轉換成LINQ這個表達式，但對我來說有點太難了，也許你可以幫助我這個！

SELECT  TOP (2) RecipeID, UserID, Name, Servings, PreparationTime, TotalTime, DifficultyLevelID, CuisineID, DishID, MainIngredientID, PriceLevelID, FlavourID, Instructions, 
         Notes, Thumbnail, VideoLink 
FROM   dbo.Recipes 
WHERE  (RecipeID NOT IN 
          (SELECT DISTINCT Recipes_1.RecipeID 
          FROM   dbo.Allergies INNER JOIN 
                dbo.UsersAllergies ON dbo.Allergies.AllergyID = dbo.UsersAllergies.AllergyID INNER JOIN 
                dbo.IngredientsAllergies ON dbo.Allergies.AllergyID = dbo.IngredientsAllergies.AllergyID INNER JOIN 
                dbo.Ingredients ON dbo.IngredientsAllergies.IngredientID = dbo.Ingredients.IngredientID INNER JOIN 
                dbo.RecipesIngredients ON dbo.Ingredients.IngredientID = dbo.RecipesIngredients.IngredientID INNER JOIN 
                dbo.Recipes AS Recipes_1 ON dbo.RecipesIngredients.RecipeID = Recipes_1.RecipeID INNER JOIN 
                dbo.Users ON dbo.UsersAllergies.UserID = dbo.Users.UserID INNER JOIN 
                dbo.AllergyFactors ON dbo.IngredientsAllergies.AllergyFactorID = dbo.AllergyFactors.AllergyFactorID 
          WHERE  (dbo.Users.UserID = 3) AND (dbo.AllergyFactors.AllergyFactorID < 3))) 

Answer 1

這將是更容易幫助你，如果你向我們展示你已經嘗試過，但像這樣的LINQ表達式應該給你相同的結果集

var query = (from rec in context.Recipes 
      where !(from al in context.Allergies 
        from ua in context.UsersAllergies.Where(x => al.AllergyID == x.AllergyID) 
        from ia in context.IngredientsAllergies.Where(x => al.AllergyID == x.AllergyID) 
        from in in context.Ingredients.Where(x => ia.IngredientID == x.IngredientID) 
        from ri in context.RecipesIngredients.Where(x => in.IngredientID == x.IngredientID) 
        from re in context.Recipes.Where(x => ri.RecipeID == x.RecipeID) 
        from us in context.Users.Where(x => ua.UserID == x.UserID) 
        from af in context.AllergyFactors.Where(x => ia.AllergyFactorID == x.AllergyFactorID) 
        where us.UserID == 3 && af.AllergyFactorID < 3 
        select re.RecipeID) 
        .Distinct() 
        .Contains(rec.RecipeID) 
      select new 
      { 
       rec.RecipeID, 
       rec.UserID, 
       rec.Name, 
       rec.Servings, 
       rec.PreparationTime, 
       rec.TotalTime, 
       rec.DifficultyLevelID, 
       rec.CuisineID, 
       rec.DishID, 
       rec.MainIngredientID, 
       rec.PriceLevelID, 
       rec.FlavourID, 
       rec.Instructions, 
       rec.Notes, 
       rec.Thumbnail, 
       rec.VideoLink 
      }).Take(2);