我正在尝试返回以下列表中产品类别为“绿色”的所有供应商，我确信它很简单，但我很挣扎：
public class Supplier
{
public int SupplierID { get; set; }
public string Name { get; set; }
public List<Product> Products { get; set; }
}
public class Product
{
public int ProductID { get; set; }
public string Name { get; set; }
public Category Category { get; set; }
}
public class Category
{
public int ID { get; set; }
public string Name { get; set; }
public Category(int ID, string Name)
{
this.ID = ID;
this.Name = Name;
}
}
public void FilterList()
{
//Get All Suppiers That Have Products In 'Green' Category
List<Supplier> GreenSupplierList = FullSupplierList.Where(x => x.Products.SelectMany(y => y.Category.Name == "Green")).ToList();
}
public List<Supplier> FullSupplierList
{
get
{
//Create List Object To Be Filter
List<Supplier> supplierList = new List<Supplier>();
int productCount = 0;
for (int i = 0; i < 10; i++)
{
Category category;
if (i > 3)
category = new Category(i, "Red");
else
category = new Category(i, "Green");
Supplier s = new Supplier();
s.SupplierID = 1;
s.Name = "Supplier " + i.ToString();
s.Products = new List<Product>();
for (int j = 0; j < 10; j++)
{
productCount += 1;
Product p = new Product();
p.ProductID = productCount;
p.Name = "Product " + productCount.ToString();
p.Category = category;
s.Products.Add(p);
}
supplierList.Add(s);
}
return supplierList;
}
}
FullSupplierList 只是一个简单的方法来返回填充列表以使用或此示例，但在 FilterList 方法中，我试图编写正确的 linq 语句。