Linq 查询在代码中引发超时，但在 LinqPad 上工作正常

Question

When I run the Linq query on LinqPad it takes only 4-5 seconds to return 5000 rows but when I run that same query in my code using Entity Framework it throws timeout.

What could be the possible issues?

Thanks in advance.

Below is the query:

var resultSale =           
    from product in Products
    join productInfo in ProductInfoSummaries on product.ID equals productInfo.ProductID
    join productDetail in ProductDetails on new { Id = product.ID, storeId = product.CreatedInStore } equals new { Id = productDetail.ProductID, storeId = productDetail.StoreID }
    
    join productInventoryOtherStore in InventoryOtherStores on product.ID equals productInventoryOtherStore.ProductID
    into productInventories
    from productInventoryOtherStore in productInventories.DefaultIfEmpty()
    
    join saleLine in SaleLines on productDetail.ID equals saleLine.ArtikkelNr
    join sales in Sales on saleLine.OrderID equals sales.ID
    
    where saleLine.ArtikkelNr != null
    && saleLine.DatoTid >= new DateTime(2018, 01, 01)
    && saleLine.DatoTid <= new DateTime(2019,11,21)
    && sales.StoreID == 14
    && (sales.OrderType == 1 || sales.OrderType == 2 || sales.OrderType == 4 || sales.OrderType == 6)
    && productDetail.SupplierProductNo != null
    && productDetail.Deleted == null
    && (productInfo.Inactive == null || productInfo.Inactive == false)
    && (product.CreatedInStore == 14 || product.CreatedInStore == 0 || product.CreatedInStore == null)
    
    group new { saleLine.AntallEnheter, sales.OrderType } by new { product.ID, productInventoryOtherStore.Amount } into g

    select new ProductSaleSummaryVM
    {
        ID = g.Key.ID,
        Inventory = (double)g.Key.Amount,
        TotalSold = g.Sum(x => x.OrderType !=4 ? x.AntallEnheter : 0) ?? 0,
        TotalWastage = g.Sum(x => x.OrderType ==4 ?  x.AntallEnheter : 0) ?? 0,
        TotalOrderedQty = 0
    };
    
var resultSupplierOrder = 
    from supplierOrderLine in SupplierOrderLines
    join supplierOrder in SupplierOrders on supplierOrderLine.SupplierOrderID equals supplierOrder.ID
    where supplierOrderLine.Deleted == null
    && supplierOrder.Status != 1
    && supplierOrder.StoreID == 14
    group supplierOrderLine by supplierOrderLine.ProductID into g
    select new ProductOrderDetailsVM
    {
        ID = g.Key,
        TotalOrderedQty = (double)g.Sum(x => x.ConsumerQuantity - x.QuantiyReceived)
    };
    
var r =   
    (from resSale in resultSale
    join resSupplierOrder in resultSupplierOrder on resSale.ID equals resSupplierOrder.ID
    into resSupplierOrders
    from resSupplierOrder in resSupplierOrders.DefaultIfEmpty()
    orderby resSale.ID
    select new ProductSaleSummaryVM
    {
        ID = resSale.ID,
        Inventory = resSale.Inventory,
        TotalSold = resSale.TotalSold,
        TotalWastage = resSale.TotalWastage,
        TotalOrderedQty = resSupplierOrder.TotalOrderedQty ?? 0
    })
    .Where(x => x.Inventory +  x.TotalOrderedQty < x.TotalSold);
            
r.Dump();

Answer 1

Try using entity framework within linqpad see if it gives you any clues. see this link on how to use entity framework in linqpad

https://www.linqpad.net/EntityFramework.aspx

Answer 2

This behaviour could be related to parameter sniffing - check this article for details