[Table("Categories")]
public class Category
{
public Category()
{
Products = new HashSet<Product>();
}
public int CategoryId { get; set; }
public string CategoryName { get; set; }
public virtual ICollection<Product> Products { get; set; }
}
[Table("Product")]
public class Product
{
public int ProductId { get; set; }
[Required, Display(Name = "Product Name")]
public string ProductName { get; set; }
public DateTime Created { get; set; }
public int CategoryId { get; set; }
public virtual Category Categories { get; set; }
}
以上是两个表格,我想显示类别列表,包括每个类别中的产品数量。我该如何使用它?
答案 0 :(得分:1)
令人惊讶的是,在重复的问题+答案和这里给出的答案中,对于任何你可以做的事情都没有发生:
var counts = from c in context.Categories
select new
{
c.CategoryName,
ProductCount = c.Products.Count()
};
答案 1 :(得分:-1)
var categoryCounts =
from p in products
group p by p.Category into g
select new { Category = g.Key, ProductCount = g.Count() };