减去从另一个泛型列表 [英] Subtract a generic list from another

问题描述

喜的朋友，我很坚持，

我想从另一个列表中删除firmIDs列表。
我真的不明白LINQ，但我敢肯定我需要使用它

 列表<公司>商行= GetBusinessDevelopmentFirms（数据库）; 
名单，LT;公司> trackedFirms = GetAllCLIFirmsBeingTrackedByUser（）; 
 
 VAR的结果= firms.Contains（I => trackedFirms.Contains（i.FirmID））; 
  

最后一行不起作用，系统提示未知方法包含（？），即使我已经把使用System.Linq的;在类的顶部。

我的想法是从所有企业的名单中删除跟踪公司的名单，找到未跟踪的公司。

我希望这是有道理的。

解决方案

  VAR结果= firms.Except（trackedFirms）; //返回所有的企业，除了那些在trackedFirms 
  

Hi friends I am really stuck,

I am trying remove a list of firmIDs from one list from another. I don't really understand linq but I am pretty sure I need to use it.

List<Firm> firms = GetBusinessDevelopmentFirms(database);
List<Firm> trackedFirms = GetAllCLIFirmsBeingTrackedByUser();

var result = firms.Contains(i => trackedFirms.Contains(i.FirmID));

The last line doesn't work and the system says "unknown method Contains(?)" even though I have put "using System.Linq;" At the top of the class.

My idea was to remove a list of tracked firms from a list of all firms to find the untracked firms.

I hope this makes sense.

解决方案

var result = firms.Except(trackedFirms); // returns all the firms except those in trackedFirms

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