LINQ查詢獲得記錄數

Question

我試圖從數據庫中檢索一些記錄以及LINQ的計數。

DataTable dtByRecipe = (from tbrp in context.tblRecipeParents 
    join tbrc in context.tblRecipeChilds on tbrp.RecipeParentID equals tbrc.RecipeParentID 
    join tbp in context.tblProducts on tbrc.ProductID equals tbp.ProductID 
    join tbps in context.tblProductSales.AsEnumerable() 
    on tbp.ProductID equals tbps.ProductID 
    join tbs in context.tblSales.AsEnumerable() 
    on tbps.ProductSalesID equals tbs.ProductSalesID select new 
    { 
     tbrp.Recipe, 
     tbp.ProductID, 
     tbps.ProductSalesID, 
     tbrp.Yield, 
     Product = tbp.ProductCode + " - " + tbp.ProductDescription, 
     ProductYield = tbrp.Yield, 
     TotalYield = "XXX", 
     Cost = "YYY" 
    }).AsEnumerable() 
    .Select(item => new { 
     item.Recipe, 
     Count = GetCount(item.ProductID, item.ProductSalesID, context), 
     item.Yield, 
     Product = item.Product, 
     ProductYield = item.ProductYield, 
     TotalYield = "XXX", 
     Cost = "YYY" 
    }).OrderBy(o => o.Recipe).ToDataTable(); 


private int GetCount (int ProductID, int ProductSalesID, MTBARKER_DBEntities context) 
{ 
    int query = (from tbps in context.tblProductSales 
     join tbp in context.tblProducts on tbps.ProductID equals tbp.ProductID 
     join tbs in context.tblSales 
     on tbps.ProductSalesID equals tbs.ProductSalesID 
     where tbp.ProductID == ProductID && tbps.ProductSalesID == ProductSalesID 
     select tbs).Count(); 

    return query; 
} 

在上面的查詢中我得到預期的結果，但是因爲有10K左右的記錄在數據庫中消耗了大量的時間來產生結果。問題出在以下我用來計算的方法。

Count = GetCount(item.ProductID, item.ProductSalesID, context), 

有沒有辦法，我可以防止這個問題的任何有效的方式？

Answer 1

Well Stored Procedures是性能的最佳選擇。在實體框架中使用存儲過程進行選擇和報告。