关于c＃：Linq选择内部方法错误 – LINQ to Entities无法识别该方法

Linq Select with inner method error - LINQ to Entities does not recognize the method

我正在为我的项目使用视图/演示者结构。该项目是一个拥有ordereditems和产品的电子通信站点。调用GetOrderSiteMsbyorderID(orderID)时，我得到一个Linq错误。

linq to entities无法识别方法"dal.views.ProductView GetProductBysku(system.string)"方法，并且此方法无法转换为存储表达式。

我知道Linq不喜欢其查询中的dynaimc内容，所以proplem是selectproduct=presenters.productsPresenter.getProductBysku(c.productsku)

我不知道如何构建getordersitemsbyorderid tolist，同时还有另一个getproductbysku方法填充字段productdetail

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public static List<OrderItemsView> GetOrdersItemsByOrderID(int orderID)
{
using (var ctx = new ProductEntities())
{

var result = ctx.OrderedItems.Where(o => o.orderID == orderID)
.Select(c => new OrderedItemsView
{
OrderItemID = c.orderItemID,
OrderID = c.orderID,
ProductSku = c.productSKU,
ProductPrice = c.productPrice,
ProdQuantity = c.prodQuantity,
ProductDetail = Presenters.ProductsPresenter.GetProductBySku(c.productSKU)
}).ToList();
return result;
}
}

/----------------/

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public class OrderedItemsView
{
public int OrderItemID { get; set; }
public int OrderID { get; set; }
public string ProductSku { get; set; }
public decimal ProductPrice { get; set; }
public int ProdQuantity { get; set; }
public decimal? ProductWeight { get; set; }

public ProductView ProductDetail { get; set; } <-- Get Product Details
}

/----------------/

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public static Views.ProductView GetProductBySku(string sku)
{
using (GroupProductEntities ctx = new GroupProductEntities())
{
//-------------------------------------------------------------------//
var results =
ctx.Products.Where(p => p.clientID == Config.ClientID && p.productSKU == sku)
.Select(p => new Views.ProductView
{
ProductID = p.productID,
ClientID = p.clientID,
CategoryID = p.categoryID,
ProductName = p.productName,
ProductImage1 = p.productImage1,
ProductPrice = p.productPrice,
ProductInventory = p.productInventory,
ProductSku = p.productSKU,
}).FirstOrDefault();
return results;
}
}

/----------------/

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public class ProductView
{
public int ProductID { get; set; }
public int? CategoryID { get; set; }
public string ProductName { get; set; }
public string ProductShortDesc { get; set; }
public string ProductImage1 { get; set; }
public decimal? ProductPrice { get; set; }
public decimal? ProductInventory { get; set; }
public string ProductSku { get; set; }
}

/----------------/

在调用该方法之前，您可能可以通过添加"tolist"来执行查询。

试试这个：

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var result = ctx.OrderedItems.Where(o => o.orderID == orderID).ToList()
.Select(c => new OrderedItemsView
{
OrderItemID = c.orderItemID,
OrderID = c.orderID,
ProductSku = c.productSKU,
ProductPrice = c.productPrice,
ProdQuantity = c.prodQuantity,
ProductDetail = Presenters.ProductsPresenter.GetProductBySku(c.productSKU)
});

我把你的ToList()向上移动了一点。您可能仍然需要在选择的末尾有一个。