Validating Array to Array Exist in Lambda or Linq

Question

How to check whether array2 is subset of array1 or not? In other words I want to check whether all elements of array2 are present in array1 or not? I want solution in Lambda or Linq.

int[] array1 = {6, 3, 1, 4, 5, 2};
int[] array2 = {1, 2, 3};

thank you for the modification and correction for my boring sentence and grammatical mistakes :D — spajce
– spajce, Commented Sep 12, 2012 at 14:04

cuongle · Accepted Answer · 2012-09-12 15:55:56Z

5

If I understood your question:

using System.Linq;

if (!array2.Except(array1).Any())
{
    ...validated!
}

edited Sep 12, 2012 at 15:55

cuongle

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answered Sep 12, 2012 at 13:43

Alessandro

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8 Comments

spajce Over a year ago

hello @Alessandro from above array1 and array2 the result is "true" when i tested the array with elements below.. the result is "false" any idea? thank you int[] array1 = { 6, 3, 1, 4, 5, 2 }; int[] array2 = { 11, 12, 6, 4, 3}; if (!array2.Except(array1).Any()) { Console.WriteLine("true"); } else { Console.WriteLine("false"); }

Alessandro Over a year ago

It's correct because not all the elements of array2 exist inside array1.

spajce Over a year ago

mmhmm i already tested the code with another elements.. the result is false

spajce Over a year ago

yes.. from the first example of mine the result is true.. but i want to check the array2 if exist in array1 elements in any order of elements

Alessandro Over a year ago

To check for one match try this: if (arrayElement2.Intersect(arrayElement1).Any())

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cuongle · Accepted Answer · 2012-09-12 14:53:31Z

1

Another simple LINQ, you can use All to check whether all items of array2 in array1:

if (array2.All(array1.Contains))
{
    // array2 is subset of array1
}

answered Sep 12, 2012 at 14:53

cuongle

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2 Comments

spajce Over a year ago

if you use your given function and the elements is like from my first example the result is true, but if you try to change the elements in any order the result is false. try this

int[] array1 = { 6, 3, 1, 4, 5, 2 };             int[] array2 = { 11, 1, 2, 3};              var s = array2.All(array1.Contains);

the correct answer is from @Alessandro if (array2.Intersect(array1 ).Any())

cuongle Over a year ago

@spajce: int[] array1 = { 6, 3, 1, 4, 5, 2 }; int[] array2 = { 11, 1, 2, 3}; it is false of course because 11 does not belong to array1

Jignesh Thakker · Accepted Answer · 2012-09-12 16:09:10Z

1

Try with,

 int[] array1 = { 6, 3, 1, 4, 5, 2 };
 int[] array2 = { 1, 2, 3 };

 bool isSubset = array2.Count(o => array1.Contains(o)).Equals(array2.Count()) ? true : false;

answered Sep 12, 2012 at 16:09

Jignesh Thakker

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