解決LINQ錯誤：缺少查詢模式實施

Question

我在嘗試過濾視圖中的集合時收到一個奇怪的LINQ錯誤。

這是我的模型：

public class adminEditProductsPricelistProductsVM 
{ 
    public Product Product { get; set; } 
    public PricelistProduct pricelistProduct { get; set; } 
} 

這是我的看法：

@using Pp.Lib.Models; 
@using System.Linq; 
@model PpLib.viewModels.admin.adminEditProductsPricelistProductsVM 

@{ 
//get corresponding PricelistProduct 
PricelistProduct thisPP = new ProofPixLib.Models.PricelistProduct(); 
thisPP = (from x in Model.pricelistProduct where x.ProductId == Model.Product.ProductId  select x).FirstOrDefault(); 
} 

的Model.pricelistProduct線強調了VS和它說了以下錯誤：

Could not find an implementation of the query pattern for source type Pp.Lib.Models.PricelistProduct. 'Where' not found.

在此先感謝您的幫助！

UPDATE 按要求 - 這裏是PricelistProduct模型的代碼。

public partial class PricelistProduct 
{ 
    public PricelistProduct() 
    { 
     this.PricelistProductOptions = new List<PricelistProductOption>(); 
    } 

    [ReadOnly(true)] 
    [Display(Name = "Pricelist Product ID")] 
    public int PricelistProductId { get; set; } 

    [ReadOnly(true)] 
    [Display(Name = "Pricelist ID")] 
    public int PricelistId { get; set; } //foregin key 
    public virtual Pricelist Pricelist { get; set; } 

    [ReadOnly(true)] 
    [Display(Name = "Product ID")] 
    public int ProductId { get; set; } //foreign key 
    public virtual Product Product { get; set; } 

    [HiddenInput] 
    public int ProductCategoryId { get; set; } // not a FK but data only 
    public virtual ProductCategory ProductCategory { get; set; } 

    [Display(Name = "Use formula")] 
    private bool _UsesFormula = true; 
    public bool UsesFormula { get { return _UsesFormula; } set { _UsesFormula = value; } } 

    private decimal _Price = 0; 
    public decimal Price { get { return _Price; } set { _Price = value; } } 

    [Display(Name = "Use discount pricing")] 
    private bool _HasDiscountPricing = false; 
    public bool HasDiscountPricing { get { return _HasDiscountPricing; } set { _HasDiscountPricing = value; } } 

    [Display(Name = "Local shipping price")] 
    private decimal _LocalShipPrice = 0; 
    public decimal LocalShipPrice { get { return _LocalShipPrice; } set { _LocalShipPrice = value; } } 

    [Display(Name = "Intl. shipping price")] 
    private decimal _IntlShipPrice = 0; 
    public decimal IntlShipPrice { get { return _IntlShipPrice; } set { _IntlShipPrice = value; } } 

    [Display(Name = "Item is taxable")] 
    private bool _isTaxable = true; 
    public bool isTaxable { get { return _isTaxable; } set { _isTaxable = value; } } 

    public virtual List<PricelistProductOption> PricelistProductOptions { get; set; } 

} 

Answer 1

你PricelistProduct類不能實現IEnumerable或IQuerable接口，換句話說，它是不是在查詢它的集合。
也許它應該是Model.pricelistProduct.PricelistProductOptions在您的查詢或您的視圖模型應該是一個集合？

連續分配沒有意義，以及：

@{ 
//get corresponding PricelistProduct 
PricelistProduct thisPP = new ProofPixLib.Models.PricelistProduct(); 
thisPP = ..; 
}