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c#listlinqlambda
Adolfok3
Adolfok3

Reputation: 310

Two for loops in lambda expression

How to create the exactly following two for's in lambda expression? 

foreach (var item in list1)
{
    foreach (var item2 in list2)
    {
        if (item.number == item2.number)
        {
            return false;
        }
    }
}

Upvotes: 1

Views: 383

Answers (3)

Yugendhar Anveshra
Yugendhar Anveshra

Reputation: 391

Here you go !!

Using Linq Method Syntax :

!list1.Any(item => list2.Any(item2 => item.number == item2.number))

Using Linq Query syntax:

!(from item in list1 
from item2 in list2
where item.number==item2.number select item).Any()

Upvotes: 0

Kevbo
Kevbo

Reputation: 943

I would just use the Intersect function available for lists and this will return you all the elements that are common in 2 lists. If you just want to see if one exists then you can do it very easily by checking the count.

int count = List1.Select(s => s.number).Intersect(List2.Select(s => s.number)).Count;

If you want to know which elements are unique in both lists then use the Exclude method.

var uniqueItems = List1.Select(s => s.number).Except(List2.Select(s => s.number));

Upvotes: 2

John Wu
John Wu

Reputation: 52280

Since you're just checking to see if any one item matches, you can use Any().

return !list1.Any( item1 => list2.Any(item2 => item2 == item1 ));

Upvotes: 3

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