I'm struggling with LINQ syntax here...thought I'd toss it out here. I cant find exactly what I'm looking for anywhere else.
OK, say I've got this:
public class Bar
{
pu开发者_JS百科blic 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();
So, long story short I want to use LINQ to filter out my list of objects based on objects from another list. I hope this makes sense. I think I'm just lost on the Contains portion...I don't know how to write that.
In general, you're looking for the "Except" extension.
var rejectStatus = GenerateRejectStatuses();
var fullList = GenerateFullList();
var rejectList = fullList.Where(i => rejectStatus.Contains(i.Status));
var filteredList = fullList.Except(rejectList);
In this example, GenerateRegectStatuses() should be the list of statuses you wish to reject (or in more concrete terms based on your example, a List<int>
of IDs)
dump this into a more specific collection of just the ids you don't want
var notTheseBarIds = filterBars.Select(fb => fb.BarId);
then try this:
fooSelect = (from f in fooBunch
where !notTheseBarIds.Contains(f.BarId)
select f).ToList();
or this:
fooSelect = fooBunch.Where(f => !notTheseBarIds.Contains(f.BarId)).ToList();
I have not tried this, so I am not guarantueeing anything, however
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;
}
Try this simple 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();
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