更新实体中的ICollection（实体框架6，ASP.NET核心）

本文介绍了更新实体中的ICollection（实体框架6，ASP.NET核心）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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();