问题描述
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我在这里用LINQ语法苦苦挣扎...我想在这里扔它。我在其他任何地方都找不到我要找的东西。
好,说我有这个:
public class Bar
{
public int BarId { get; set; }
}
public class Foo
{
public List<Bar> BarList { get; set; }
}
List<Foo> fooBunch = GetABunchOfFoos(); //let\'s just assume I\'m getting more than one
List<Foo> fooSelect = new List<Foo>;
List<Bar> filterBars = GetAFewBars(); //assume I\'m getting like 2 or 3
fooSelect = (from f in fooBunch
where !(from b in f.BarList select b.BarId).Contains(ITEM FROM filterBars.BarId)
select f).ToList();
因此,长话短说,我想使用LINQ根据另一个列表中的对象过滤掉我的对象列表。我希望这是有道理的。我想我只是在“包含”部分迷路了……我不知道该怎么写。
解决方法
通常,您正在寻找\“ Except \”扩展名。
var rejectStatus = GenerateRejectStatuses();
var fullList = GenerateFullList();
var rejectList = fullList.Where(i => rejectStatus.Contains(i.Status));
var filteredList = fullList.Except(rejectList);
在此示例中,GenerateRegectStatuses()应该是您希望拒绝的状态的列表(或更具体而言,根据您的示例为ID的“ 2”)
,将其转储到您不想要的ID的更具体的集合中
var notTheseBarIds = filterBars.Select(fb => fb.BarId);
然后试试这个:
fooSelect = (from f in fooBunch
where !notTheseBarIds.Contains(f.BarId)
select f).ToList();
或这个:
fooSelect = fooBunch.Where(f => !notTheseBarIds.Contains(f.BarId)).ToList();
,我没有尝试过,所以我没有任何保证
foreach Bar f in filterBars
{
search(f)
}
Foo search(Bar b)
{
fooSelect = (from f in fooBunch
where !(from b in f.BarList select b.BarId).Contains(b.ID)
select f).ToList();
return fooSelect;
}
,试试这个简单的LINQ:
//For a file list/array
var files = Directory.GetFiles(folderPath,\"*.*\",SearchOption.AllDirectories);
//simply use Where ! x.Contains
var notContain = files.Where(x => ! x.Contains(@\"\\$RECYCLE.BIN\\\")).ToList();
//Or use Except()
var containing = files.Where(x => x.Contains(@\"\\$RECYCLE.BIN\\\")).ToList();
notContain = files.Except(containing).ToList();