How to check if a List contains all the elements of Another List in C# - Step by Step Examples

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How to check if a List contains all the elements of Another List in C# ?

Answer

To check if a list contains all the elements of another list in C#, you can use LINQ's Intersect method.

✐ Examples

1 Check if List Contains All Elements of Another List (Positive Scenario)

In this example,

We create two lists named list1 and list2 with different values.
We use LINQ's Intersect method to find the intersection of list1 and list2.
If the count of the intersection is equal to the count of list2, then list1 contains all elements of list2.
Finally, we print the result to standard output.

C# Program

using System;
using System.Linq;
using System.Collections.Generic;

class Program {
    static void Main() {
        List<int> list1 = new List<int> {1, 2, 3, 4, 5};
        List<int> list2 = new List<int> {2, 4};
        bool result = list2.Intersect(list1).Count() == list2.Count;
        Console.WriteLine("List 1 contains all elements of List 2: " + result);
    }
}

Output

List 1 contains all elements of List 2: True

2 Check if List Contains All Elements of Another List (Negative Scenario)

In this example,

We create two lists named list1 and list2 with different values.
We use LINQ's Intersect method to find the intersection of list1 and list2.
If the count of the intersection is not equal to the count of list2, then list1 does not contain all elements of list2.
Finally, we print the result to standard output.

C# Program

using System;
using System.Linq;
using System.Collections.Generic;

class Program {
    static void Main() {
        List<int> list1 = new List<int> {1, 2, 3, 4, 5};
        List<int> list2 = new List<int> {2, 4, 6};
        bool result = list2.Intersect(list1).Count() == list2.Count;
        Console.WriteLine("List 1 contains all elements of List 2: " + result);
    }
}

Output

List 1 contains all elements of List 2: False

Summary

In this tutorial, we learned How to check if a List contains all the elements of Another List in C# language with well detailed examples.

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How to check if a List contains all the elements of Another List in C# - Step by Step Examples

How to check if a List contains all the elements of Another List in C# ?

Answer

✐ Examples

1 Check if List Contains All Elements of Another List (Positive Scenario)

C# Program

Output

2 Check if List Contains All Elements of Another List (Negative Scenario)

C# Program

Output

Summary

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