更新实体中的ICollection（实体框架6，ASP.NET核心） [英] Update ICollection in Entity (Entity Framework 6, ASP.NET Core)

问题描述

我有两个模型：

public class Customer : People
  {
     public int CustomerID { get; set; }
     public decimal? Weight { get; set; }
     public decimal? Height { get; set; }
     public ICollection<Purchase> Cart { get; set; } 
  }

和 

public class Purchase
  {
     public int PurchaseID { get; set; }
     public DateTime Time { get; set; }
     public decimal TotalPrice { get; set; }
     public int Amount { get; set; }
     public Good Good { get; set; }
   }

我已经有客户需要更新他的购物车（例如为其添加smth） 。

I already have a customer and need to update his Cart (to add smth to it for example).

我试图像这样做smth但这没有任何作用。我做错了什么？

I've tried to do smth like this but this do nothing. What am i doing wrong?

Customer customer = new Customer()
      {
        CustomerID = currentID.Value                   
      };
var cart = new List<Purchase>();
      cart.Add(new Purchase()
      {
        Amount = 1,
        Good = good,
        Time = DateTime.Now,
        TotalPrice = good.Price    
      });                                                                                
      customer.Cart = cart;
      var entry = _context.Entry(customer);
      _context.Update(customer);
      _context.SaveChanges();

推荐答案

在EF6中（不确定它与EF Core是否相同），您可以执行以下操作来更新记录。

In EF6 (not sure if it's the same with EF Core) you would do the following to update a record.

_context.Entry(customer).State = EntityState.Modified; 
_context.SaveChanges(); 

这篇关于更新实体中的ICollection（实体框架6，ASP.NET核心）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！