How to check if an element inside a List of string array exists in another List of string array

I basically want to know if a string array from one list exists in another list of string array

So for example:<BR>
List 1:<BR>
{"A", "R1"}<BR>
{"A", "R2"}<BR>

List 2:<BR>
{"A", "R1"}<BR>
{"B", "R1"}<BR>
{"B", "R2"}<BR>

Then If I loop in List 1 to check whether it exists in List 2 the results will be:<BR>
true<BR>
false

I want to do it in LINQ if possilbe

You can use

> Any and SequenceEqual

for this.

using System.Collections.Generic;

List<string[]> testSet = new List<string[]>
{
    new string[] { "A", "R1" },
    new string[] { "A", "R2" }
};

List<string[]> resultSet = new List<string[]>
{
    new string[] { "A", "R1" },
    new string[] { "B", "R1" },
    new string[] { "B", "R2" }
};

// Checks if the value is found anywhere in the list
bool IsArrayInList(string[] value, List<string[]> list)
{
    return list.Any(value.SequenceEqual);
}

foreach (var val in testSet)
{
    Console.WriteLine(IsArrayInList(val,resultSet));
}

Console.ReadLine();

I would suggest a combination of .Any() and .SequenceEqual() or .All()

Example:

var list1 = new string[][]
{
    new string[] { "A", "R1" },
    new string[] { "A", "R2" },
};
var list2 = new string[][]
{
    new string[] { "A", "R1"},
    new string[] { "B", "R1"},
    new string[] { "B", "R2"},
};
var itemToFind = list1.First();
// Option 1
var isInList2 = list2.Any(i => i.SequenceEqual(itemToFind));
// Option 2
var isInList2Option2 = list2.Any(item => item.All(innerItem => itemToFind.Contains(innerItem)));

As-needed, you can improve these to account for ordering, case-insensitivity, exact number of arguments, etc...
Option 1 will find any matches where the inner sequence is in the same order, same-casing as what you are looking for.
Option 2 will find any matches where the inner sequence contains all of the values of the sequence you are checking for.

Hopefully this points you in the right direction at least.