我需要帮助在复杂的环境中使用linq来执行sum
这是实体
public class Product : EntityBase
{
[Key]
public int ProductId { get; set; }
public string Description { get; set; }
public string ReportText1 { get; set; }
public string ReportText2 { get; set; }
public bool Standard { get; set; }
public int ProductGroupId { get; set; }
public decimal? Surcharge1 { get; set; }
public decimal? Surcharge2 { get; set; }
public decimal? Surcharge3 { get; set; }
public decimal? Surcharge4 { get; set; }
public decimal PriceIn { get; set; }
public decimal PriceOut { get; set; }
public decimal PriceArtisanIn { get; set; }
public decimal PriceArtisanOut { get; set; }
public decimal PriceTotalIn { get; set; }
public decimal PriceTotalOut { get; set; }
public decimal PriceTotalOutVat { get; set; }
public decimal PriceAdjustment { get; set; }
public bool Calculate { get; set; }
public string Notes { get; set; }
public virtual ProductGroup ProductGroup { get; set; }
public virtual ICollection<ProductArticle> ProductArticles { get; set; }
}
public class ProductArticle : EntityBase
{
[Key]
public int ProductArticleId { get; set; }
public int ProductId { get; set; }
public int ArticleId { get; set; }
public decimal Qty { get; set; }
public decimal PriceIn { get; set; }
public bool Primary { get; set; }
public virtual Product Product { get; set; }
public virtual Article Article { get; set; }
}
public class Article : EntityBase
{
[Key]
public int ArticleId { get; set; }
public string ErpId { get; set; }
public string Supplier { get; set; }
public string Description { get; set; }
public string Specification { get; set; }
public string Unit { get; set; }
public string Account { get; set; }
public decimal PriceIn { get; set; }
public virtual ICollection<ArticleTime> ArticleTimes { get; set; }
}
public class ArticleTime : EntityBase
{
[Key]
public int ArticleTimeId { get; set; }
public int ArticleId { get; set; }
public int TimeId { get; set; }
public virtual Article Article { get; set; }
public virtual Time Time { get; set; }
}
public class Time : EntityBase
{
[Key]
public int TimeId { get; set; }
public int ArtisanId { get; set; }
public string Paragraph { get; set; }
public string Description { get; set; }
public string Unit { get; set; }
public decimal PriceIn { get; set; }
public bool System { get; set; }
public decimal Qty { get; set; }
}
从产品中我想要时间和数量。 首先从Product,迭代所有ProductArticle然后在Article迭代ArticleTime内,然后在这里转到Time and Sum this。
或者更好的是在产品名称TotalQty中创建一个新列,并在save方法中进行总和?问题是当我向文章添加时间时,产品实体将不会自动更新。有什么想法吗?
答案 0 :(得分:1)
如果我理解正确你需要总数量
var sum = dbContext
.Products
.Sum(p => p.ProductArticles
.Sum(pa => pa.Article
.ArticleTimes
.Sum(at => at.Qty)));