[英]Loading related entities in EF6
我有3個彼此相關的表:
Product
有很多SuggestedPrices
Product
有許多Product
ProductPricing
所以我想像這樣檢索建議價格:
await ctx.SuggestedPrices
.OrderByDescending(pp => pp.SuggestionDate)
.Include(p1 => p1.Customer)
.Include(p2 => p2.Product)
.Include(p3 => p3.Product.ProductPricing)
.ToListAsync()
根據您的要求:我添加了以下內容:
產品類別:
public class Product : ReportingBase {
// Product-ProductPricing -> One Product has many Prices
public virtual ICollection<ProductPricing> ProductPricing { get; set; }
// Product-SuggestedPrices
public virtual ICollection<SuggestedPrice> SuggestedPrices { get; set; }
}
產品定價類:
public class ProductPricing {
// ProductPricings-Product
public virtual Product Product { get; set; }
public int ProductId { get; set; }
}
建議價格等級:
public class SuggestedPrice : EntityBase {
// SuggestedPrices-Product
public virtual Product Product { get; set; }
public int ProductId { get; set; }
// SuggestedPrices-Customer
public virtual ApplicationUser Customer { get; set; }
public string CustomerId { get; set; }
}
但是當我添加行.Include(p3 => p3.Product.ProductPricing)
,出現錯誤消息:
使用虛線路徑作為參考導航屬性,使用Select運算符作為集合導航屬性
我如何擺脫這個錯誤?
謝謝你的回答
經過一些努力后,我發現不需要包含Product.ProductPricing
並且它已經存在:
OrgPrice = p.Product.ProductPricing.FirstOrDefault().OrgPrice,
PriceAfterDiscount = p.Product.ProductPricing.FirstOrDefault().Price
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