How to compare two lists for equality in C#?

Set the two lists −

List One

List < string > list1 = new List < string > ();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");

List Two

List < string > list2 = new List < string > ();
list2.Add("C");
list2.Add("D");

Now if the following returns different elements, then it would mean the lists are not equal −

Example

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

public class Demo {
   public static void Main() {
      List < string > list1 = new List < string > ();
      list1.Add("P");
      list1.Add("Q");
      list1.Add("R");

      Console.WriteLine("First list...");
      foreach(string value in list1) {
         Console.WriteLine(value);
      }

      Console.WriteLine("Second list...");
      List < string > list2 = new List < string > ();

      list2.Add("P");
      list2.Add("R");
      foreach(string value in list2) {
         Console.WriteLine(value);
      }

      Console.WriteLine("Difference in the two lists...");
      IEnumerable < string > list3;
      list3 = list1.Except(list2);
      foreach(string value in list3) {
         Console.WriteLine(value);
      }
   }
}

Samual Sam

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Updated on: 21-Jun-2020

1K+ Views

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