List.remove需要外部程序调用 [英] List.remove needs an external programmatic call

问题描述

在我的图书馆管理（学术）项目中，我创建了一个供应商类，我希望能够：

a）添加订单。订单是一个单独的类。

b）删除订单。

c）使用其中一个属性订购订单，订单ID

私人清单<订单> OrdersByVendor = new List< Order>（）; 
 
 public void removeOrder（ulong OrderID，ulong VendorID）
 {
 // TODO：查找订单并将其删除的逻辑
订单myorder = new Order（1， 1,1,0， 单元，0， EUR， ）; 
 OrdersByVendor.Remove（myorder）; 
} 
 public void removeOrder（ulong OrderID）
 {
 // TODO：查找订单并将其删除的逻辑
订单myorder = new Order（1,1， 1,0， 单元，0， EUR， ）; 
 OrdersByVendor.Remove（myorder）; 
 
} 
 

如何实施？你需要更多信息吗？



到目前为止，我有一些删除对象的东西，但是，我需要将相同的对象传递给供应商和订单class，不是我想要的OrderID和VendorID，因为，我不确定程序员如何通过传递对象本身来识别对象，也许有人可以指导我完成这个复杂的实现，或者我可以更简单地做到这一点吗？ br />

  public   void  removeOrder（Order whichOrder）
 {
 OrdersByVendor.Remove（whichOrder）; 
} 

解决方案

而不是创建订单的新实例（保证不在列表中，因为它是一个全新的实例）你需要找到实例。

你可以这样做：

订单ord = OrdersByVendor.FirstOrDefault（ o = >  o.OrderID == OrderId）; 

检查返回null，如果不是，则将其删除。

Within my library management (academic) project, I have created a Vendor class, which I am hoping will be able to:
a) add an Order. Order is a separate class.
b) remove an Order.
c) find an order using one of its attributes, OrderID

private List<Order> OrdersByVendor = new List<Order>();

   public void removeOrder(ulong OrderID, ulong VendorID)
   {
       //TODO: logic for finding order and removing it
       Order myorder = new Order(1,1,1,0,"unit",0,"EUR","");
       OrdersByVendor.Remove(myorder);
   }
   public void removeOrder(ulong OrderID)
   {
        //TODO: logic for finding order and removing it
       Order myorder = new Order(1,1,1,0,"unit",0,"EUR","");
       OrdersByVendor.Remove(myorder);

   }

How do I implement it? Do you require further information?

So far, I have something of the sort to remove the Object, however, I need to pass the same object to the Vendor and Order class, not the OrderID and the VendorID as I would like, since, I am not sure how a programmer will identify the object by passing the object itself, perhaps someone can guide me through this complex implementation, or can I do it simpler?

public void removeOrder(Order whichOrder)
   {
       OrdersByVendor.Remove(whichOrder);
   }

解决方案

Instead of creating a new instance of an Order (which is guaranteed not to be in the list as it is a brand new instance) you need to find the instance.
You could do something like:

Order ord = OrdersByVendor.FirstOrDefault(o => o.OrderID == OrderId);

Check the return for null, and remove it if it isn't.

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