I'm trying to filter users by department. The filter may contain multiple departments, the users may belong to multiple departments (n:m). I'm fiddling around with LINQ, but can't find the solution. Following example code uses simplified Tuples
just to make it runnable, of course there are some real user objects.
Also on CSSharpPad, so you have some runnable code: http://csharppad.com/gist/34be3e2dd121ffc161c4
string Filter = "Dep1"; //can also contain multiple filters
var users = new List<Tuple<string, string>>
{
Tuple.Create("Meyer", "Dep1"),
Tuple.Create("Jackson", "Dep2"),
Tuple.Create("Green", "Dep1;Dep2"),
Tuple.Create("Brown", "Dep1")
};
//this is the line I can't get to work like I want to
var tuplets = users.Where(u => u.Item2.Intersect(Filter).Any());
if (tuplets.Distinct().ToList().Count > 0)
{
foreach (var item in tuplets) Console.WriteLine(item.ToString());
}
else
{
Console.WriteLine("No results");
}
Right now it returns:
(Meyer, Dep1)
(Jackson, Dep2)
(Green, Dep1;Dep2)
(Brown, Dep1)
What I would want it to return is: Meyer,Green,Brown. If Filter
would be set to "Dep1;Dep2"
I would want to do an or-comparison and find *Meyer,Jackson,Green,Brown" (as well as distinct, as I don't want Green twice). If Filter
would be set to "Dep2"
I would only want to have Jackson, Green. I also played around with .Split(';')
, but it got me nowhere.
Am I making sense? I have Users with single/multiple departments and want filtering for those departments. In my output I want to have all users from the specified department(s). The LINQ-magic is not so strong on me.
Since
string
implementsIEnumerable
, what you're doing right now is anIntersect
on aIEnumerable<char>
(i.e. you're checking each letter in the string). You need to split on;
both onItem2
andFilter
and intersect those.