我如何得到我的查詢比較價格？

Question

下午，

如果價格匹配，我想返回bool。我回來了3個不同的價格，但我需要比較低價格和amzprice是否相同。如果他們是我還需要回...

pricematched = true 

下面是我當前的查詢。

var query = from a in dc.aProducts 
      join t in dc.tProducts on a.sku equals t.sku 
      join lp in dc.LowestPrices on a.asin equals lp.productAsin 
      orderby t.title 
      select new GetLowestPrices 
      { 
       productAsin = lp.productAsin, 
       sku = t.sku, 
       title = t.title, 
       oprice = Convert.ToString(t.tPrice), 
       lowprice = Convert.ToString(lp.price), 
       amzprice = Convert.ToString(lp.tAmzPrice), 
       lastupdated = Convert.ToDateTime(lp.priceDate) 
      }; 
      return query.ToList(); 

所有幫助將不勝感激，謝謝。

Answer 1

如果你能布爾添加到現有的對象，它只是因素查詢象下面這樣：

var query = from a in dc.aProducts 
     join t in dc.tProducts on a.sku equals t.sku 
     join lp in dc.LowestPrices on a.asin equals lp.productAsin 
     orderby t.title 
     select new GetLowestPrices 
     { 
      productAsin = lp.productAsin, 
      sku = t.sku, 
      title = t.title, 
      oprice = Convert.ToString(t.tPrice), 
      lowprice = Convert.ToString(lp.price), 
      amzprice = Convert.ToString(lp.tAmzPrice), 
      lastupdated = Convert.ToDateTime(lp.priceDate), 
      pricematched = lp.tAmzPrice >= lp.price // This should do it 
     }; 
     return query.ToList(); 

否則你必須與輔助查詢做查詢外：

var matchedItems = query.Where(x => x.amzprice >= x.lowprice); 

Answer 2

select new GetLowestPrices 
     { 
      productAsin = lp.productAsin, 
      sku = t.sku, 
      title = t.title, 
      oprice = Convert.ToString(t.tPrice), 
      lowprice = Convert.ToString(lp.price), 
      amzprice = Convert.ToString(lp.tAmzPrice), 
      lastupdated = Convert.ToDateTime(lp.priceDate), 
      pricematched = lp.price == lp.tAmzPrice 
     }; 

順便說一句，爲什麼字符串的價格？另外：

return query.ToList(); 

如果你能逃脫的return query反而讓一個列表，然後執行。

Answer 3

我決定用jQuery來代替。