如何使用 c# 中 2 个类的对象进行计算？

Question

Here are Models:

public class Order_Items
{
    public int orderId { get; set; }
    public int itemId { get; set; }
    public int quantity { get; set; }
    public double itemPrice { get; set; }
}     

public class Items 
{
    [Key]
    public int id { get; set; }
    public String name { get; set; }
    public int quantity { get; set; }
    public double price { get; set; }
    public String text { get; set; }
}

My question is how can I set the value of itemPrice by calculating Order_Items.quantity * Items.price.

Answer 1

Put a reference to Items class on Order_Items class

Public Items Item {get;set;}

Then change the ItemPrice property to getter only with the following

Public double ItemPrice=>Item.Price*quantity;

Note that you must set the item property and to avoid NullReferenceException on reading